NEXTGEN SCE-NG2320B460V Saginaw Control & Engineering User Manual

NEXTGEN SCE-NG2320B460V Saginaw Control & Engineering

User Manual

This instruction manual contains information and instructions to enable the user to work safely, correctly and economically on the unit. Understanding and adhering to the manual can help one:

• Avoid any dangers
• Reduce repair costs and stoppages
• Extend and improve the reliability and working life of the unit

PLEASE ENSURE TO USE THE RIGHT VERSION OF THE INSTRUCTION MANUAL SUITABLE FOR YOUR UNIT
Intended use
The unit is to be used exclusively for the dissipation of heat from control cabinets and enclosures in order to protect temperature-sensitive components in an industrial environment. To meet the conditions of use, all the information and instructions in the instruction manual must be adhered to.

• General Danger
  Indicates compulsory safety regulations which are not covered by a specific pictogram such as one of the following.

• High Electric Voltage
  Indicates electric shock danger.

• Important Safety Instruction
  Indicates instructions for safe maintenance and operation of the unit.

• Attention
  Indicates possible burns from hot components.

• Attention
  Indicates possible damage to the unit.

• Instruction
  Indicates possible danger to the environment.

Legal Regulations

Liability
The information, data and instructions contained in this instruction manual are current at the time of going to press. We reserve the right to make technical changes to the unit in the course of its development. Therefore, no claims can be accepted for previously delivered units based on the information, diagrams or descriptions contained in this manual. No liability can be accepted for damage and production caused by:

• Disregarding the instruction manual
• Operation error
• Inappropriate work on or with the unit
• The use of non-specified spare parts and accessories
• Unauthorized modifications or changes to the unit by the user or his personnel

Saginaw Control & Engineering is only liable for errors and omissions as outlined in the guarantee conditions contained in the main contractual agreement. Claims for damages on any grounds are excluded.

Safety Instructions

Upon delivery the unit is already meeting current technical standards therefore it can be safely taken into operation. Only trained specialists are allowed to work on the unit. Unauthorized personnel must be prohibited from working on the unit. Operating personnel must inform their superiors immediately if any malfunction of the unit becomes apparent. Please note that before starting to work on or with the unit, a procedure must be carried out inside the cabinet on which the unit is to be mounted. Before commencing work inside the cabinet, the control cabinet manufacturer’s instructions must be read with regards to:

• Safety instructions
• Instructions on taking the cabinet out of operation
• Instructions on the prevention of unauthorized cabinet reconnection

The electric equipment meets the valid safety regulations. One can find dangerous voltage (above 50V AC or above 100V DC):

• Behind the control cabinet doors
• On the power supply in the unit housing

The units have to be fused according to the type plate and the wiring diagram. Switch the unit off immediately if the electric power supply is interrupted.

• Danger Through Incorrect Work on the Unit
  Only specialized personnel are allowed to maintain and clean the unit. Regular maintenance and cleaning must be kept in order to ensure that the unit remains in perfect working condition and has a long working life.

• Danger from Electric Voltage
  Only specialized personnel are allowed to maintain and clean the unit. The person must ensure that for the duration of the maintenance and cleaning, the unit is disconnected from the electrical supply.

• Attention
  Damage to the unit through the use of inappropriate cleaning materials. Please do not use aggressive cleaning material.

• Instruction
  Damage to the environment through unauthorized disposal. All spare parts and associated material must be disposed of according to environmental laws.

Settings

The cooling unit is intended to be used as a complementary accessory to larger industrial equipment. The unit is used where heat needs to be dissipated from electrical control cabinets or similar enclosures in order to protect heat- sensitive components. It is not intended for household use. The unit has two completely separate air circuits which ensure that the clean cabinet air does not come into contact with the ambient air which may well be dirty or polluted. Enclosure cooling units can dissipate large quantities of heat from sealed enclosures such as electrical enclosures into the ambient air and at the same time reduce the cabinet internal temperature to below that of the ambient air. The unit can function without problems in extreme ambient conditions (e.g. dusty and oily air) with a standard operating temperature ranging between +10°C and +55°C. Units can be ordered with an additional electrical cabinet heater. For the cooling capacities and environmental ratings please refer to the type plate data.

The display shows the temperature in the range of -50°C to +150°C (-58°F to +302°F). The temperature is displayed with a resolution of tenths between -19.9°C and +99.9°C (-3.8°F to +211.8°F). During programming, it shows the codes and values of the parameters. The display also shows icons according to occurring events.

Setting cooling set point, St1:

1. Press “SET” and the display should show St1 and then the pre-set value of St1. (default: +35°C / +95°F)
2. Reach the desired value by using ▲ or ▼.
3. Press “SET” again to save the new value of St1.

Setting heating set point, St2 (only for units supplied with internal heater):

1. Press “SET” twice slowly and display should show St2 and then the pre-set value of St2. (default:+5°C / +41°F)
2. Reach the desired value by using ▲ or ▼.
3. Press “SET” again to save the new value of St2.

Setting temperature units (°C / °F), low-temperature alarm and high- temperature alarm:

1. Press the “PRG” button for 5 seconds to reach the modifiable parameter list.
2. Use ▲ or ▼ to reach the desired parameter:
   • C18 for temperature unit of measure
   • °C = 0
   • °F = 1
   • P25 for low temperature alarm threshold (default -10°C / +14°F)
   • P26 for high temperature alarm threshold (default +55°C / +131°F)
3. Press “SET” on the desired parameter to display the current value.
4. Use ▲ or ▼ to reach the desired value.
5. Pressing “SET” temporarily saves the new value and returns to the parameters list.
6. Repeat steps 2-5 to set other parameters.
7. Press “PRG” for 5 seconds to permanently save the new values.

Alarm Relay Function
Both normally closed (NC) and normally open (NO) alarm contacts are provided. These refer to the alarm state. Under normal conditions, the NC contact is closed and the NO contact is open. When an alarm condition is present or the door contact is open, the NC contact will open and the NO contact will close. System power failure will give an alarm condition.

Notes:

• State 2: Additional icons (1,3,4, Reverse, Direct, Test) depending on operation.
• State 3: The display shows “OFF” alternating with the standard display.
• State 4: The display shows “EXX” alternating with the standard display – at the same time, the alarm icon flashes.

Failure table:
The display shows either ‘’OFF’’ or “EXX” with an icon flashing (triangle), alternating with the standard display. If more than one error occurs, these are shown in sequence on the display.

Important Notes

• Whilst programming, if no button is pressed for 10 seconds, the display starts flashing, and after 1 minute returns to the main display without saving changes.
• To increase scrolling speed, press and hold the ▲ or ▼ button for at least 5 seconds.
• When pressing “PRG” for 3 seconds, the firmware revision code is displayed for 2 seconds.
• When cleaning the controller panel, do not use ethanol, hydrocarbons, ammonia or their by products. Use neutral detergents and water.
• In order to protect the unit’s components, minimum relay output on (3 or 7 minutes) and off (4 minutes) times and minimum time (7 or 11 minutes) between activation of the same relay output are applied.
• In case of digital inputs not configured, probes not fitted or configured, or St2 not enabled on the controller the display shows ‘nO’.

Functional Principle

The cooling unit for enclosures works on the basis of a refrigeration circuit consisting of four main components: compressor, evaporator, condenser and expansion device. The circuit is hermetically sealed and R134a refrigerant circulates inside it (R134a is chlorine-free and has an Ozone Destruction Potential [ODP] of 0 and a Global Warming Potential [GWP] of 1430). The compressor compresses the refrigerant (thus taking it to high pressure and high temperature), and pushes it through the condenser, where it is cooled by ambient air thus passing from the gas to the liquid state. At the liquid state, it then passes through the capillary pipe being a much lower pressure the refrigerant arrives to the evaporator where it absorbs the necessary heat to change from liquid to gas state. The gas is then drawn back into the compressor completing the cycle.

1. Air Intake, Cabinet Side
2. Radial Fan, Cabinet Side
3. Evaporator
4. Air Outlet, Cabinet Side
5. Compressor
6. Air Intake, Ambient Side
7. Radial Fan, Ambient Side
8. Condenser
9. Air Outlet, Ambient Side
10. Filter Dryer
11. Expansion Valve

Technical Data

Short Circuit Current Rating for Air Conditioners and Heat Exchangers
As per UL508A Supplement SB, Seifert Systems’ air conditioners have a default SCCR of 5 kA. If no additional measures are taken in the installation, the resulting SCCR rating in the control panel would be 5 kA, assuming that the air conditioner is the lowest-rated component in the panel. However, a high fault SCCR is conditional on the use of specific overcurrent protective devices. Table SB4.2 (UL508A) lists the Fuse Peak let through currents, Ip, and clearing, I2t, based on available short circuit current levels for a number of fuse types. A high fault SCCR can be achieved with the use of a time delay fuses such as Class CC. The current limiting fuse used must have an SCCR higher or equal than that of the panel. Additionally, the let-through current Ip of the fuse must be less than 5 kA. The fuses must be marked as Current Limiting and the let-through current must be verified from the manufacturer’s curves. Refer to the unit’s type plate data for fuse rating. Article 409 of the 2008 National Electric Code (NFPA 70) requires industrial control panels to be marked with a short circuit current rating. As specified in the National Electric Code, UL508A-2001 Supplement SB, the Standard of Safety for Industrial Control Equipment, provides an accepted method for determining the short-circuit current rating of the control panel. The SCCR rating for our air conditioners and heat exchangers has a default value of 5 kA. You may use a 5 or 10 kVA isolation transformer between the customer’s panel and our air conditioner and not have an effect on the customer’s 65kA rating. You may use a fuse or circuit breaker with a 5 kA short circuit rating on the line side of the ACU and its branch circuit protective device and not have an effect on the customer’s 65 kA rating. The current-limiting fuse or circuit breaker used on the line side of the branch circuit protection for the ACU must have an SCCR => that of the panel rating. Additionally, for a current limiting fuse the customer would need to verify using table SB4.2 of UL 508A, that the let- through current (Ip * 103)of the fuse is <= 5KA. If a circuit breaker is used as feeder protection, it must be marked Current Limiting type by the manufacturer, and the panel builder would need to verify based on the manufacturer’s published curves that it will let through <= 5kA. Examples of these curves are included in the UL 508A supplement SB. You can run separate circuits for the panel and the air conditioner as long as each is labeled with its individual SCCR ratings. (5 kA and 65 kA) If the customer does not implement one of the options above, then the resulting SCCR rating would be the 5 kA rating of the ACU, if that is the lowest-rated component in the panel. Testing represents another option; however, if the customer does not implement these options, then the resulting short circuit rating of the panel is based on the lowest short circuit current rating of all power circuit components installed in the panel.

Performance Graph

Mounting

The power supply rating on unit rating plate must comply with the mains rating. Always disconnect the power supply before opening the unit. The heat load to be dissipated from the enclosure should not exceed the specific cooling output of the unit at any condition. When selecting a cooling unit, always allow for a safety margin of at least 15% extra cooling output in the worst conditions. Air inlets and outlets must be completely free from obstruction. Ensure that flows of air leaving and entering the cooling unit, internal and external, are not obstructed. It must also be ensured in accordance with UL, that the air outlet is not blowing air directly at an equipment operator. Should this be the case a barrier or duct shall be provided to redirect the airflow. The cooling unit enclosure air suction hole must be installed at the highest possible point. When installing the unit on a door ensure it can take the weight. Before drilling the enclosure, ensure the fixing elements and couplings will not interfere with the equipment inside the enclosure itself. Disconnect power before starting any work inside the enclosure. Following the Drilling Template, drill the holes and make the required cuts on the enclosure. This template may have been affected by storage conditions, please check this template by verifying values of the largest dimensions before drilling. Fit the sealing strip to the cooling unit on the side connected to the enclosure and follow the installation diagram. If the unit is mounted in a recessed position, the controller bracket can be pulled according to the wall thickness of the enclosure outwards as per the steps below.

Condensate Management:
High humidity and low temperatures inside the enclosure can lead to condensation on the evaporator. Condensate that flows back into the enclosure can damage sensitive control electronics. The integrated condensate evaporation of the cooling unit releases the condensate to the environment. If condensate formation is too great, additional condensate can drip into an overflow trough, which then drains off on the ambient side. In order to prevent the formation of excessive condensate, you should nevertheless:

• Check the seals at regular intervals
• Consider installing a door contact switch. This can prevent condensation from forming when the enclosure door is left open.

Cold air outlet duct:
When using a cold air outlet duct please follow the steps below.

Filter installation:
If you install/replace a filter please follow the steps below.

Mounting Principle

Do not use within the first 15 minutes after installation.

1. M6 Screws
2. M6 Toothed Washers
3. M6 Flat Washers
4. Enclosure
5. Mounting Gasket
6. Lifting Sling
7. Cover
8. M4 Screws

Cutout Dimensions

Dimensions (H x W x D)

Electrical Connection

Caution, risk of death

Unconnected and / or faulty protective conductor systems can lead to dangerous voltages and electric shocks which can cause serious accidents. Work on electrical connections may only be carried out by trained electrical engineers.
Door Switch
The unit can be switched ON and OFF via a door contact switch. When delivered the door contact terminals are bridged on the female connector. To connect the door contact switch remove the bridge and connect door contact switch. The contact must be closed when the cabinet door is closed.
It is possible to change the logic of the door switch (controller firmware rev. 1.2 or higher). This can be set by changing the value of parameter c68. Refer to the table below and section Controller: Setting temperature units (°C / °F), low temperature alarm, door contact logic section for more information.

Wiring Diagram

Modbus Connection

Taking Into Operation

Attention!
The unit can be damaged by a lack of lubricant. To ensure that the compressor is adequately lubricated, the oil, which has been displaced during transport, must first be allowed to flow back into place. The unit must therefore be allowed to stand for at least 30 min. before being connected to the mains and taken into operation. The unit/system must be protected with an MCB Type D or K. Upon connection the internal fan will start working. If the temperature inside the enclosure is higher than the set value of the controller both the compressor and external air fan start working. The cooling cycle will either stop once the air inside the enclosure reaches the set temperature minus hysteresis or once the minimum On-time is reached. The hysteresis is 3K, the minimum ON-time is 4 minutes, and the minimum OFF-time is 3 minutes, for units with a cooling capacity of more than 1 kW is it usually 7 minutes. The setpoint for the internal enclosure temperature is pre-set at 95°F.

Troubleshooting

Unit Does Not Cool

| Internal fan does not work| Power not connected| Verify power supply

Internal fan works, external fan and compressor do not work

| Enclosure temperature is

below setting temperature (St)

| Verify values of parameter “St”
Door switch contact is open| Verify door switch
Controller does not work| Replace controller
Internal fan works, external fan and compressor do not

work Display shows alternating

“OFF” and temperature

| The sequence of the phases inside the power supply connector is incorrect|

Change phases inside power supply connector

External and internal fan work, compressor does not work

| Compressor motor electrical failure| Verify external fan, verify ambient temperature, clean condenser
Capacitor for compressor failed| Replace capacitor
Compressor works, external fan does not work| External fan needs to be replaced| Replace external fan

Enclosure Overheating

| Compressor and fans (external and internal) work all the time| Unit cooling undersized| Enclosure needs a bigger cooling unit
Compressor and external fan work in alternating mode (ON / OFF)| Thermal compressor protector triggered| Verify ambient temperature,

clean condenser

Refrigerant leakage| Contact dealer/service center

Excessive Condensate

|

Door enclosure open

|

Ambient air gets into the enclosure

| Ensure door is closed, add a door switch and connect it to controller

Door enclosure closed

| Enclosure IP degree minimum

IP54

| Seal openings on enclosure
Damaged/misplaced sealing

strip

| Repair strip accordingly

Maintenance & Cleaning

Always switch the power supply off before starting any maintenance on the unit. Wait for 5 minutes for electrical components to discharge. The cooling unit is generally maintenance-free and can be operated without filters in most environments.
If the ambient air is extremely dusty, we recommend installing filter mats (see accessories). These should be cleaned or replaced at regular intervals. Oily or greasy filter mats should be replaced immediately. Do not use a steam jet or high pressure to clean the filter mats. Do not wring out the filter mats. If the ambient air is extremely oily, we recommend the use of metal filters (see accessories). They can be cleaned with standard cleaning agents and reused. In addition, the unit should have regular functional tests (approx every 2,000 hours depending on the grade of ambient pollution).
Note: The use of filter mats/metal filters reduces the cooling capacity of the unit.
Disposal
The cooling unit contains R134a refrigerant and small quantities of lubricating oil. Replacement, repairs and final disposal must be done according to the regulations of each country for these substances.

Transportation & Storage

Malfunction due to transport damage
On delivery, the carton box containing the unit must be examined for signs of transport damage. Any transport damage to the carton box could indicate that the unit itself has been damaged in transit which in the worst case could mean that the unit will not function. The unit can only be stored in locations that meet the following conditions:

• Temperature range: -40°F to 158°F
• Relative humidity (at 77°F): max. 95%
• The cooling unit should always be stored according to the installation position

Returning the unit
To avoid transport damage the unit should be returned in the original packing or in a packing case and must be strapped to a pallet. If the unit cannot be returned in the original packing please ensure that:

• A space of at least 30 mm must be maintained at all points between the unit and the external packing
• The unit must be shipped in the same position as it was mounted
• The unit must be protected by shock-resistant padding (hard foam corner pieces, strips or cardboard corner pieces)

Parts Supplied

Parts Supplied:

• Full version of the instruction manual
• CE declaration of conformity
• 1:1 mounting template
• M6 * 16 bolts
• A6.4 toothed washers
• A6.4 washers
• 5 – pole terminal block for signals
• 4 – pole terminal block for electrical connection
• 3 – pole terminal block for RS 485 MODBUS
• Drain fitting
• Foam tape

Warranty / Limits of Liability

All goods manufactured by SCE shall be warranted to be free of defects in material or workmanship for a period of two years from the date of shipment. Should the product be proven to SCE to be defective, we shall option to repair or replace the product. At no time will SCE reimburse the purchaser for unauthorized rework on any product. Air Conditioners & Heat Exchangers are warranted on parts and service for a period of two years from the date of shipment by Saginaw Control and subject to the following conditions and exclusions:  All Goods must be installed and operated according to the following specifications: Maximum voltage variation no greater than plus or minus 10% of nominal rating; Maximum frequency variation no greater than plus or minus 3 Hz. from nominal rating; Must not exceed minimum and maximum rated temperatures; Must not exceed (BTU/Hr) rating; Filters must be cleaned regularly; Must be installed and grounded in accordance with all relevant electrical and safety codes, as well as the National Electric Code and OSHA rules and regulations; Must be installed in a stationary application, free of vibration. Our warranty does not warranty a product that has been modified, subjected to abuse, negligence in operation or maintenance, or if the product is used in a manner that exceeds its designed capabilities and rating. Warranty-related claims will be returned to the factory for evaluation and final disposition of the claim, any replacement parts will be invoiced at standard pricing and credit issued for the returned product. If the product has been found to have been modified, subjected to abuse, negligence in operation or maintenance, or if the product has been used in a manner that exceeds its designed capabilities and rating, credit may be reduced, denied or additional cost may be assessed and passed on to the purchaser, such as return freight.

Saginaw Control and Engineering

• 95 Midland Road
• Saginaw, MI 48638-5770
• Phone: 989-799-6871
• Fax: 989-799-4524
• sce@saginawcontrol.com

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