SCS 975 Ionized Air Blower User Guide

SCS 975 Ionized Air Blower

975 Ionized Air Blower

Description

The SCS 975 Ionized Air Blower is used for neutralizing electrostatic charges on insulators and ungrounded conductors. Its fast discharge times (< 1 second at 12 inches) and ±10 volt offset voltage exceed the required limits of ANSI/ESD S20.20 and ESD TR53. The 975Ionized Air Blower monitors its offset voltage (balance), and it alarms when emitter cleaning is required. A built-in automatic emitter point cleaner periodically brushes away dust and minimizes maintenance. The emitters may be accessed for thorough cleaning with the use of a single thumb screw. The 975 Ionized AirBlower features a powder-coated steel enclosure, multi-mount stand, and terminal block with alarm output for machine integration.
The SCS 975 Ionized Air Blower operates on Steady-state DC. Steady-state DC systems consist of separate negative and positive ion emitters connected by a pair of high-voltage cables to their respective high-voltage power supplies. DC power is constantly applied to the emitter points. The ionizer utilizes sampling from its inner fan grill to continuously adjust the output and maintain its offset voltage.

The primary method of static charge control is a direct connection to the ground for conductors, static dissipative materials, and personnel. A complete static control program must also deal with isolated conductors that cannot be grounded, insulating materials (e.g., most common plastics), and moving personnel who cannot use wrist or heel straps or ESD control flooring and footwear. Air ionization is not a replacement for grounding methods. It is one component of a complete static control program. Ionizers are used when it is no possible to ground everything properly and as a backup to other static control methods. In clean rooms, air ionization may be one of the few methods of static control available.” [ESD Handbook ESD TR20.20Ionization, section 5.3.6.1 Introduction and Purpose / General Information] The 975 Ionized Air Blower and its accessories are available as the following item numbers:

975A| Ionized Air Blower with North America Power Adapter
975N| Ionized Air Blower without Power Adapter
975P| North America Power Adapter

Packaging

• 1 Ionized Air Blower
• 1 Ground Wire
• 1 Power Adapter (975A only)
• 1 North America Power Cord (975A only)
• 1 Certificate of Calibration

Features and Components

Figure 2. 975 Ionized Air Blower features and components

• A. Fan Grill Thumb Screw: Loosens the fan grill, so it may be swung to the side and grant access to the emitter points for cleaning.
• B. Power Switch: Powers the ionizer ON and OFF.
• C. Ion Balance Dial: Use a flat-blade screwdriver to rotate the dial clockwise to change the ion balance in the positive direction and counterclockwise to change the ion balance in the negative direction.
• D. Status LED: Provides 6 different indications. See the table below.

is not set to 0V
Blinking red once per

1.6 seconds

| Fan does not rotate
Blinking red twice per

1.6 seconds

| High-voltage module failure
Blinking red three times per 1.6 seconds| Ion balance out of control
Blinking red four times per 1.6 seconds| Drive failure in emitter point cleaner

• E. Fan Speed Dial: Use a Phillips-head screwdriver to rotate the dial clockwise to increase the fan speed or counterclockwise to decrease the fan speed.

• F. Terminal Block: Wires to external power providedby a machine and outputs an alarm signal. See
  “Terminal Block Setup” on page 3 for more information.

• G. Power Inlet: Connect the included power adapter here.

Installation

Hardware Setup
Install the included ground wire to Terminal 7 at the back of the ionizer. Connect the opposite end of thewire to equipment ground. Place the 975 Ionized Air Blower at a desired location where the airflow will not be restricted. Ensure a space of at least 4 inches (10 cm) at the rear and on both sides of the ionizer to providesufficient airflow. Use the tilt lock knobs to aim theionizer at the area to be neutralized. Ensure that thepower switch is set to OFF. Connect the ionizer’s power cord into an appropriate AC power source. Note that placement of the ionizer is important in determining its effectiveness. The distance from the targeted object and fan speed affect the ionizer’sperformance. The discharge time will increase as thedistance increases or fan speed is reduced.

Terminal Block Setup
Use insulated wires in 18-24 AWG size for wiring to the terminal block.

Terminals 1 and 2 are for power input from a 24 VDC supply when not using the included power adapter. Terminals 3 and 4 are for alarm output. They are used for open collector output (up to 30 V and 100 mA). Current flows between terminals 3 and 4 (GND) on thterminal block when an alarm is output.

Terminals 5 and 6 control the timing of the emitter point cleaner. When multiple units are fed from the same power supply, the rated power of the supply maybecome insufficient if cleaning occurs simultaneously.To avoid this situation:

• Prepare a power supply that can provide the total power needed for simultaneous cleaning. Terminals 5 and 6 are not used in this case.
• Make connections between the terminal blocks on multiple units to avoid a peak of power consumptionat one time by allowing cleaning to occur in sequence. See below.

Connect the ionizers as shown below. This will make Unit I work as a master and Units II, III, and IV as slaves so that the four sets of emitter points are cleaned oneafter the other.

Terminal 7 is for grounding the ionizer. Grounding is required for optimal performance of the ionizer.

Operation

1. Position the ionizer so that maximum airflow is directed towards the items or area to be neutralized.
2. Rock the power switch to the ON position. The status LED will illuminate green during normal operation.
3. Set the fan speed dial to the desired setting. Higher airflow will result in faster discharge times.

Maintenance

Occasional cleaning of the case and of the ionizing electrodes are the only routine maintenance procedures required.
Cleaning the Enclosure
Wipe the enclosure with a soft cloth moistened with water. If a stronger cleaning solution is required, mild soap with water may be used. The use of any othercleaning solutions is not recommended.
Cleaning the Emitter Points
CAUTION: Disconnect the power to the ionizer whenever cleaning the emitter points. When the emitter points become dirty, the internal circuitry of the ionizer will be automatically adjusted to emit an equal amount of positive and negative ions. The automated brushes will keep the emitter points clean by brushing them 8 times per cleaning cycle. The cycle runs hourly. Particulates on the emitter point may, however, inhibit ionization to a limited degree. Theemitter points are located behind the front grills. A jetof clean, compressed air can be used to remove dirt  on emitter points. If a more rigorous cleaning method isneeded to remove particulate, clean the points with acotton swab dampened with isopropyl alcohol. Accessto the points is available through the front grill. Loosen the thumb screw to disconnect the fan grill and swing i to the side. Be careful not to damage the points during cleaning

Figure 9. Swinging the front fan grills to access the emitter points inside the ionizer

Calibration

The SCS 975 Ionized Air Blower is factory adjusted to provide optimum performance. Further adjustment in thefield is not possible. However, the following instructionscan be followed to determine whether the Ionizer is performing to specifications. The testing follows theprocedure outlined in the standard for Ionization, ANSI/ESD STM3.1. Please refer to this standard for morecomplete information.
Frequency of recalibration should be based on the critical nature of those ESD sensitive items handled andthe risk of failure for the ESD protective equipment and materials. In general, SCS recommends that calibrationbe performed annually. Periodically measure the balance and neutralization times of the ionizer to verify that it is performing within specifications. These measurements should be taken using a charged plate monitor. Calibration should be performed in accordance with the ESD Association ionization standard ANSI/ESD STM3.1. With the ionizer positioned a distance of 12 inches (30 cm), the  neutralization (discharge) time of ±1000V to ±100V  should be less than 1.5 seconds, and the balanceshould be ±10V or better.

Neutralization (Discharge) Times
The comparative efficiency of bench top ionizers is determined by a standard test published by the ESDAssociation: ANSI/ESD STM3.1. Typical positive and negative decay times (±1000V to ±100V) measuredusing this standard are shown in Figure 11.
NOTE: All discharge times are in seconds and representative only. They are not a guarantee. Thedischarge times were recorded in a factory ambient environment.

Specifications

Input Voltage and Frequency
(External Adapter):

• Power Input: 100-240 VAC, 50/60 Hz
• Power Output: 24 VDC, 2.7 A
• Power Adapter Cable Length: 5.0′ (1.5 m)
• Power Cord Length: 6′ (1.8 m)
• Operating Environment: 50° to 104° F (10° to 40° C) 20 to 70% R.H.
• Neutralization (Discharge) Time at 12″: < 1 second
• Offset Voltage (Balance) at 12: ±10 V typical
• Ion Emission: Steady-state DC
• Airflow: 128 CFM max. (3.63 m³/min)
• Ozone: <0.05 ppm
• Power Consumption: 20 W
• Emitter Points: Tungsten
• Dimensions (without stand): 7.9″ H x 6.7″ W x 2.8″ D (200 mm x 170 mm x 72mm)
• Weight: 3.2 lbs (1.5 kg)
• Country: of Origin Japan

Warranty

• Limited Warranty, Warranty Exclusions, Limit of Liability and RMA Request Instructions
• See the Desco Asia Warranty –
• DescoAsia.com/Limited-Warranty.aspx.
• Desco Asia – 193-12 Yachimata-i, Yachimata-shi, Chiba, 289-1143, Japan
• Phone: +81 43-309-4470
• Website: DescoAsia.com.

References

• Desco Asia - Manufacturer of ESD Static Control Products
• Desco Asia - 975A IONIZED AIR BLOWER, NORTH AMERICA
• Desco Asia - 975N IONIZED AIR BLOWER, WITHOUT POWER ADAPTER
• Desco Asia - 975P POWER ADAPTER, 100-240VAC IN, 24VDC 2.7A OUT, NORTH AMERICA
• Desco Asia - Limited Warranty

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