Section | Seies | 1570-1015 | Rev | 2022-03-01 | e-mail csd@pow.com
Section 9 | Sequence of Operation
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5. If there is excessive motor current draw that causes motor overheating, the
overcurrent sensor (OCS) in the control panel will protect the li motor by cutting
o the power to the control circuit. This will happen when the carriage is loaded
beyond its rated capacity. See Section 15 for more information.
6. If the either of the drive chains or li chains break or becomes slack, the sensor
limit switch activates to shut o power to the motor and apply the brake. The
carriage stops. The VRC will not operate until the chain is repaired and the chain
sensor readjusted. See Figure 9-5 and Figure 9-6.
7. The li chain tensioner limit switch is typically mounted at the bottom of the li
column. If a li chain becomes slack or broken, the chain tensioner limit switch
activates to shut o power to the motor and apply the brake. The safety cam
rotates and sets on the column. The carriage stops. The VRC will not operate until
the li chain is repaired and the chain tensioner readjusted. See Figure 9-6.
Sequence
(continued)
Drive Chain
10308-0002.SMG
PFL-180718-2
Drive Chain Tensioner Figure 9-5
Lift
Chain
10308-0002.SMG
PFL-2161-1
Li Chain
Figure 9-7
Li Chain Tensioner
Figure 9-6
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