GE DS200SVIAG1A Gas turbine DO module

Zero speed torque RS resistor No resistor is fitted as standard. Mount an RS resistor to adjust the amount of torque current to be applied to the motor when the drive has received a STOP command. The RS resistor value is a function of the following: • Motor characteristics (e.g. armature resistance and temperature) • Brush resistance (changing with wear) To achieve an accurate value, it is advisable to carry out a simple test by fitting a 2.2MΩ potentiometer in the RS location, enable the drive and set the potentiometer to reach the required torque level. It is recommended that when the value of RS is established, you replace the potentiometer with a conventional resistor.

Dynamic calibration

 For modifying the settings, the following equipment is required: Low frequency function generator Frequency range: 0Hz to 10MHz Output voltage: –3.5V to +3.5V Twin-trace storage oscilloscope. 1. Remove the speed reference signal from pins 9 and 10. 2. Connect the function generator output to pins 9 and 10. 3. Set the function generator at the following: Square wave output Amplitude: ±2V Frequency: 0.2Hz 4. Connect oscilloscope channel A to pin 11. 5. Connect oscilloscope channel B to pin 1. 6. Connect oscilloscope ground to pin 8.

Set the oscilloscope as follows

Sensitivity: 1mV per division Timebase: 20ms per division Connect the oscilloscope external trigger input to the function generator output When the motor load is a slide with limited travel, avoid the slide activating the limit switches by increasing the reference signal frequency or decreasing the reference signal amplitude in order to reduce the speed.

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PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module

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