Y LOCKED ROTOR STATE TEST FOR 4
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CIPPERT POWER GEAR’ CONTROL BOXES a
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Purpose

This test will check for the Step Control Box being in the Locked Rotor State. This is when the Step Control

Box does not send out voltage to the Step motor on the 2-wire motor plug.

Perform the testing of the 4-way connector in Kwikee Step Control Testing Procedures, document # 82-

ST0500, before proceeding with this test.

This Tl affects the following Power Gear Control Boxes:

+ 9090510000
+ 909510001 Power Gear Documentation
; 151000040 ec
| azstosorn =| si Step Identification Guide Tip Sheet
Removal and replacement of the step motor
Resources 82-0502 for 9010000462, 9010000464, 9010000465 and
+ Voltmeter 9010000466 Revolution Series
Owner's Manual for Revolution Series
I . 30100002262 Steps with control boxes 1510000140 and
Instructions 1510000172
Locked Rotor State

The control box provides operational power to start, stop and reverse the motor. Current sensing

determines the end-of-cycle.

A secondary time-out feature stops the motor in the event that the Step Control Box does not reach and

sustain the current limit.

After the Step Control current limits, or times out, the Step Control will electrically lock the motor’s rotor.

The Step Control Box will remain in the Locked Rotor State until the next Step Control actuation signal

conditions are met.

Unlocking the Step Control Box From the Locked Rotor State

1. Unplug the 2-step Control plug from the motor.

2. Verify the Step Control Box's lockout switch is in the correct position (no voltage on the white wire) for
this test. Verify voltage status by checking the white wire at the 4-way connector for voltage. If there is
voltage, move the switch to the other position and recheck.

3. Using a voltmeter set on DC Voltage, check for voltage on the 2-pin Step Control plug that was
unplugged in step 1. There will be voltage on the red lead and ground on the yellow lead during Step
Extension (door open). This condition is reversed on Step Retraction (door closed).

4. Cycle the entry door open and closed a minimum of six cycles, pausing 3-5 seconds between each
complete cycle. This gives the step control internal relays enough time to reset.

5. When voltage is detected on the 2-pin motor plug, the Step Control Box is now out of the Locked Rotor
State. Plug the 2-pin Step Control plug back into the motor.

If after the six cycles there is still no voltage detected on the 2-pin connector, replace the Step Control Box.

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