Drive Startup (System 12 SCR Drive)
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iControl DC
Running on Machine Room Inspection
Once you are satisfied that the brake is picking properly, you need to verify proper car move-
ment and motor current, troubleshoot if car movement is not as it should be, and calibrate
speed using a handheld tachometer.
Verifying Car Movement (System 12 SCR Drive)
1. On the Pattern > Common tab, set Pattern scaling = 100%.
2. Set the iBox Inspection switch to INSP and run the car using the Enable and Up (or
Down) switches.
If the car runs satisfactorily, but in the opposite direction commanded:
1. Display the Configuration > Drive > General tab and change the Rotational direction
parameter in the Speed Reference section.
2. If you have not yet done so, select Acquire under the Write privilege menu and press the
“Yes” softkey on the iBox to grant yourself write permission. In iView, click the Send
button to send the changed value to iControl.
3. Reverse the motor field wires at MF1 and MF2.
4. Run the car using the Enable and Up (or Down) buttons. Verify that it travels in the
direction commanded.
If the Car “Runs Away”
1. If using an encoder, reverse the Rotational direction as described above.
2. If using a tachometer, swap the TS (+) and TC (-) connections as described above.
Feedback from the encoder or tach controls car speed. If the tach is incorrectly connected or the
encoder speed reference set incorrectly, the car is continuously accelerated rather than con-
trolled.
If the Current Limit LED Lights
If the Current Limit LED on the System 12 SCR Drive turns ON:
1. Increase the value of Armature current limit on the Configuration > Drive > Safety tab
slightly (10% increments) to allow more torque output.
If any of the System 12 SCR Drive protective devices trip, the DRIVE READY light will go OFF.
Push the Fault Reset button on the iBox and the READY light will turn ON again after a few sec-
onds (if there is no fault in the System 12 SCR Drive).
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