mercia ATS 16A Automatic Transfer Switches Instruction Manual

Mercia ATS 16A Automatic Transfer Switches

Product Information

Specifications:
The Mercia Range is a PC-class automatic transfer switch, with a rated working current ranging from 16A to 630A. It is designed for use in power systems to ensure the continuity of the power supply by transferring loads between two power sources.

General Information
The switch has three working positions: Main (I), Standby (II), and Off (0). It is suitable for firefighting linkage and infrequent connection and disconnection of power supply systems. Commonly used in hospitals, shopping malls, banks, the chemical industry, high-rise buildings, and military facilities.

Working Conditions

• Ambient temperature: -5°C to +40°C (average temperature within 24h must not exceed +35°C).
• Humidity: Up to 50% relative humidity at +40°C, higher humidity allowed at lower temperatures (e.g., up to 90% at +25°C).
• Installation altitude: Not to exceed 2000m.
• Pollution degree: Level 3.
• EMC electromagnetic compatibility: Class B.

Transportation and Storage Conditions

• Avoid exposure to rain or snow during transportation and storage.
• Temperature range: -25°C to +55°C, short-time exposure up to +70°C within 24h.

Model Definition
ATS ### # E – Mercia Range: 4 Pole / 2 Pole – Current Rating (A) – Switch Type

Technical Data

Application| No. Of Poles| Rated Working Current (A)| Rated Working Voltage| Rated Insulation Voltage| Rated Impulse Withstand Voltage| Utilization Category| Rated Short Time Withstand Current (0.2s)| Rated Short Time Making Capacity| Rated Control Voltage| Contact Transfer Time| Transfer Time Recovery| Transfer Time Power Off Duration| Operational Cycles| Switch Dimension| Weight
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
32A-80A| 2, 3, 4| 16, 20, 25, 32, 40, 63, 80| AC400V/415V 50Hz| 690V| 8kV AC33B| 10kA| 10kA Peak| 25Us| AC230V 50Hz| (1.25+Time Delay) Seconds| (2.1+Time Delay) Seconds| 8500 Seconds| 1500 Seconds With Load / 10000 Seconds Total| 230x125x130 mm| 2.5 kg

Product Usage Instructions:

• Optional Modules:
• Structure and Overall Dimensions:
• Controller Features:
• Wiring Diagram:
• Usage and Maintenance:
• Common Fault and Troubleshooting Methods:
• Warranty:

Frequently Asked Questions (FAQ):

• Q: What should I do if the ambient temperature exceeds the recommended range?
  A: If the usage environment does not meet the specified conditions, it should be communicated to the manufacturer for further guidance.

• Q: Can the automatic transfer switch be used in residential settings?
  A: The switch is mainly designed for commercial and industrial applications where an uninterrupted power supply is critical. It may not be suitable for typical residential use.

• Q: How do I troubleshoot if the switch fails to transfer the load between power sources?
  A: Refer to the “Common Fault and Troubleshooting Methods” section in the manual for step-by-step instructions on diagnosing and resolving transfer issues.

GENERAL INFORMATION

The Mercia Range is a PC class automatic transfer switch, rated working current 16A to 630A and to be used in power systems for ensuring the continuity of the supply, by transferring a load between two power supply sources.
The switch has three working positions Main (I), Standby (II) and Off (0), which can be used for fire-fighting linkage and infrequent connection and disconnection of power supply systems. These units are mainly used in hospitals, shopping malls, banks, the chemical industry, metallurgy, high-rise buildings, military facilities and fire-fighting occasions where power failure is not allowed. The product conforms to IEC60947-6-1: Low-voltage switchgear and control gear – Part 6-1: Multiple function equipment-transfer switching equipment.

WORKING CONDITIONS

1. Ambient temperature: -5℃～+40℃, average temperature within 24h must not exceed +35℃.
2. Humidity: When the highest temperature is +40℃, the relative humidity in the air must not exceed 50%. Higher relative humidity is allowed at lower temperatures, for example, up to 90% at +25℃. Special measures should be taken for the occasional condensation due to temperature changes.
3. Installation altitude: The altitude of the installation site must not exceed 2000m.
4. Pollution degree: Level 3.
5. EMC electromagnetic compatibility: Class B (public).

Note:
If the usage environment does not meet the above conditions, it should be explained to the manufacturer.

TRANSPORTATION AND STORAGE CONDITIONS

• The product should not be exposed to rain or snow during transportation and storage.
• Transportation and storage temperature range: -25℃～+55℃, up to +70℃ in a short time (within 24h).

MODEL DEFINITION

TECHNICAL DATA

OPTIONAL MODULES

Functionality

Operation, RS485 Communication
Transfer Mode| Auto Transfer, Auto Recovery/Auto Transfer, No Auto Recovery
Display Mode| LED/LCD
Source 1 Monitoring| Under voltage, over-voltage, power loss monitoring (A, B & C phase)
Source 2 Monitoring| Under voltage, over-voltage, power loss monitoring (A, B & C phase)
Generator Control| Yes (Gen Start and Stop)
Fire-Linkage Control| One group voltage-free signal to cut off both power and 1 group voltage-free feedback
Frequency Monitoring| ±20% Adjustable
Generator Test| Yes
Transfer Delay Timer (s)| Default 5s, 0~180s (Adjustable)
Recovery Delay Timer (s)| Default 5s, 0~180s (Adjustable)
Under Voltage Range| Default 187V, 154~198V Adjustable
Over Voltage Range| Default 263V, 242~330V Adjustable
Source Priority| Source 1 Priority (Default), Source 2 Priority, No Priority
RS485 Communication| Yes

STRUCTURE AND OVERALL DIMENSIONS

Structure Introduction

Overall Mounting Dimensions

CONTROLLER FEATURES

Controller Introduction

• Source I/II over/under-voltage monitoring
• Source I/II over/under frequency monitoring
• Source I/II power ON running status LED indication
• When the switch is working normally, the LCDs the switch information. When adjusting the parameters, it will display the parameter settings. Before the transfer operation and transfer delay timer is displayed in a countdown mode.
• Fire-fighting linkage function: The controller has a set of passive fire-fighting signal input terminals, which can accept external passive fire-fighting signals, and transfer to double off-position. It also has a set of passive feedback signal output terminals, which can return the switch’s in-position signal to the firefighting equipment.
• Generator control function: The controller has a set of relay dry contacts to control the start and stop of the generator, and can set the start delay and stop delay of the generator (needs to beconnected to the auxiliary power supply DC24V).
• Communication function: Configure RS485 communication port and Modbus-RTU communication protocol, which can realize remote signalling, remote measurement, remote control, and remote adjustment (D-type controller).

Transfer Mode

Control Panel Introduction

1. AUTO/MANU working status indicator.
2. SET entry setting menu indicator.
3. GEN generator starts working status indicator.
4. STOP fire linkage working status indicator (force transfer to double off working position).
5. Source I voltage, frequency display.
6. Source II voltage, frequency display.
7. SET key: Press the entry setting interface on the SET menu. Press to confirm the settings.
8. AUTO/MANU key to select transfer mode. AUTO is auto transfer, and MANU is manual transfer. On SETmenu, press to save the settings and exit.
9. On manual working mode and when either source I/II is available, press key transfer to double off the working position: on the SET menu, use the turndown key.
10. On manual working mode and when source I am available, press key transfer to the source I supply: onSET menu, use the scroll up key.
11. On manual working mode and when source II is available, press key transfer to source II supply: onSET menu, use the scroll down key.
12. On the setting menu, press to turn up.

Basic Keyboards Operations

• On the main interface (voltage/frequency display), press the “SET” key. Enter the password interface and input password “888”. Press the “AUTO/MANU” key to exit. Press the “SET” key to confirm the password. If the password is correct, it will enter the settings menu. If wrong, it will go back to the voltage/frequency display.
• On the main menu interface, the “SET” key is to enter the menu, and the “← → ” key is to scroll up/down the menu. the “+ -” is to turn up/down the specific values, and the “AUTO/MANU” key is to save and exit the menu.
• On the menu interface, press the “AUTO/MANU” key to go back to the main menu display interface. When not at the main menu interface and there is no operation for a while, it will go back to the main menu interface automatically.
• Calibrate voltage. On the main interface, press and hold the “AUTO/MANU” key until coming to the password interface and input password “888” to enter the voltage calibration interface. Press the key “+ -” to turn up/down the volts to calibrate the voltage at each phase voltage.
• On the main menu interface, press and hold the “-” key for 5s, it will restore factory settings. (Caution)

System Operation
When powered on, it will display the main interface.

• On the main interface, the controller auto-runs and source I is the priority. ATS is on the source I working position, LCD supplying source’s three-phase voltage in turn and supply power’s frequency. Below are examples of displays in normal running status.

Password Interface
The default password is “888”. Below is an example of the password interface. Input the password to the entry setting menu. If the password is wrong, then press the “SET” key to go back and retry.

For easy operation, the before factory has set default values as below:

• A-1: Source I under voltage transfer volts: 187V.
• A-2: Source I over voltage transfer volts: 263V.
• A-3: Source I to source II transfer time delay: 5s.
• A-4: Source II under voltage transfer volts: 187V.
• A-5: Source II overvoltage transfer volts: 263V.
• A-6: Source II to source I transfer time delay: 5s.
• A-7: Generator start time delay: 5s.
• A-8: Generator stop time delay: 5s.
• A-9: Transfer modes: 1 (source I priority).
• A-10: Under frequency lower limit: 40Hz/50Hz (base on 50Hz/60Hz).
• A-11: Over frequency upper limit: 60Hz/70Hz (base on 50Hz/60Hz).

Parameter Settings. Note: customers can customise the value per actual application, concerning the setting below:

Key-press instruction
When the controller is working, press the “SET” key and enter the password“888”. Then press the “SET” key again. Continue and press “SET” to select the setting menu A, C or H. Press “→ ” to enter into the setting menu.

A Menu: Transfer Value Settings

C Menu: Communication Modbus

D Menu: To Calibrate Time Up To Date (base time for setting H menu generator start/stop timer)

Key Press Instruction
When the controller is working, long press “+” to display the LCD time query menu. Press “←→ ” to check the current date and time. Press “AUTO/MANU” to exit the menu.

To change the time setting, first press “+” to enter the time menu. Long press “SET” until the data display flickers. Press “←→ ” to change the setting item. Press “+” or “-” to increase or decrease the data. Press “SET” to exit the menu. If there is no operation for 10 seconds, it will automatically exit the menu.

H Menu: Generator Start/Stop Timer

Control modules wiring terminals instruction – 4P wiring diagram

Note

1. Port 601~603 is available at the controller with a Communication function
2. Outer solid line frame for user connection.
3. When the controller is a passive type, a 3P product needs to be connected with Neutral.

Control terminals instruction

• 101-103: Source I power supply signal output (active output AC230V / 0.5A)
• 101: Source I external LED indicator common neutral line and 3P neutral line input terminal
• 101, 102: Source I power signal indication
• 101, 103: Source I Closing signal indication
• 201-203: Source II power supply signal output (active output AC230V/0.5A)
• 201: Source II external LED indicator common neutral line and 3P neutral line input terminal
• 201, 202: Source II power signal indication
• 201, 203: Source II closing signal indication

Note: 101-“N1” and 201-“N2” are control power neutral wires for 3P products.

WIRING DIAGRAMS

301-302: auxiliary power input port (DC12V/24V).

• The purpose of connecting the auxiliary power supply is to control the start delay timer of the generator when the switch is in grid-generation mode.
• If there is no auxiliary power supply, the start delay time of the generator is 0s.
• If the generator delay function is not needed, the auxiliary power supply is not needed.

401-402: Fire linkage control port (passive).

• 401, 402- firefighting linkage signal input: 401, 402 ports can only be connected to a set of normally open passive contacts, when the normally open contacts are closed, the controller immediately controls the switch transfer to double off position, cutting off the load power.
• Note: If the fire signal is active, the signal must be transferred via a small relay then connect the normally open contact to the controller port.

403, 404: Fire linkage signal output.

• Inside ports 403 and 404 are a set of passive contacts that are normally open, which are used for the feedback signal of fire-fighting actions.
• Ports 403 and 404 are normally open, when the fire signal is input and the switch is switched to the double-off position, contacts 403 and 404 are closed.

Note:
When the fire-fighting function is activated, the switch is in the double-off position. If the switch needs to resume normal operation, press any key on the controller panel to remove the fire-fighting signal.

501- 503: generator signal output port (passive).

• When the backup ( Ⅱ ) power supply is a generator group, the user can realize the automatic start function after connecting to the generator controller through terminals 501-503, inside ports 501- 503 are a group passive relay dry contact, 502 is the common terminal, 501 is the normally open point, and 502 is the normally closed point.
• In the grid-generator working mode and the controller is in AUTO mode, when the main power supply is normal, 502-501 is closed, and 502-503 is disconnected, if the main power supply fails, and when the standby is out of power, 502-503 will be closed after the generator starts delay timer, and 502-501 will be disconnected at the same time, and send a signal to start the generator.
• After the transfer delay timer is over, the switch will first switch to the double position. When the power generation group comes in, the controller will execute the generator warm-up delay timer. After the delay, the switch will automatically switch to the standby power supply side. During the standby side power supply process, when the main power supply is restored, if it is normal, the controller will control the switch to transfer to the main power supply after the return delay timer.
• After the main power is ON, 502-501 will be closed after the generator stops the delay timer. At the same time, 502- 503 will be disconnected and send a signal to stop the generator. Action flow can be referred to as 8.2 Grid-generator mode.

601- 603: RS485 communication port.
601 A+; 602 B; 603 GND; communication protocol MODBUS-RTU.

USAGE AND MAINTENANCE

1. The switch should be installed correctly. Check whether the content of the nameplate meets the requirements before installation, and confirm that the switch is in the off state.
2. When wiring the switch, it should be connected strictly under the signs. For three-pole products, the neutral wire should be connected to the neutral terminal. Connect the fire linkage and power generation control according to the actual situation, and make sure the product is well grounded.
3. When the switch is working normally, the “Run/Stop” button needs to be set to the “Run” position. When the controller needs to be locked, it can be set to the “Stop” position. The controller cannot be operated in the “Stop” position.
4. Please regularly check (recommended every three months) that the product is working properly. Clear the dust on the surface of the enclosure to maintain good insulation. Pay attention to moisture-proof and dust-proof switches that have not been used for a long time. Before use, operate the ATS manually or automatically to debug.

COMMON FAULTS & TROUBLESHOOTING METHODS

WARRANTY

To serve every customer well, Craig & Derricott makes the following instructions on the warranty period and after-sales service. When the user follows the storage and use conditions, the product will be covered under warranty for 12 months from the date of delivery. During this period, users need to use and maintain the instructions. When the product is damaged or cannot be used normally due to quality problems, Craig & Derricott will repair or replace it free of charge.

If the failure is caused by the following reasons, it can be repaired or replaced for a fee even within the warranty period:

1. Failure caused by improper use, self-modification and unauthorized disassembly;
2. Damage caused by dropping or bad installation;
3. Exceed the standard specifications for product use;
4. Due to factors: such as earthquakes, fires, lightning strikes, other natural disasters and secondary disasters.

When this product is at the end of its service life, to protect our environment, please recycle the product or its parts and materials.

For full details, please visit our website:
https://craigandderricott.co.uk/customer-services/ats-warranty/.

LEARN MORE AT
WWW.CRAIGANDDERRICOTT.COM.

© Craig & Derricott Limited 2023 – CDPD270 Issue 1.

References

• Home - Craig & Derricott
• ATS Warranty - Craig & Derricott

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