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HOLLISTER-WHITNEY "ROPE GRIPPER
NORMAL OPERATION
Power to the "ROPE GRIPPER
•
DZ2 provide power to the gripper; when the doors close, RG1 and RG2 energize. As the car
leaves the floor DZ1 and DZ2 de-energize, power to the "ROPE GRIPPER
through RG1 and RG2. When approaching a new floor DZ1 and DZ2 again energize, when
the doors open RG1 and RG2 de-energize.
OVERSPEED
•
When an overspeed is detected, the Governor overspeed switch opens. Additional overspeed
can be detected by use of an encoder or tachometer that detects the speed of the elevator.
(Not the motor or worm shaft of a geared elevator.) When detected, relays RG1, RG2, DZ1
and DZ2 de-energize. This removes power from the "ROPE GRIPPER
and stopping the car.
OVERSPEED RESET
•
Overspeed reset is accomplished by resetting the Governor overspeed switch and possibly the
elevator control circuits. Refer to and follow the controller manufacturer's instructions for
"ROPE GRIPPER
IMPORTANT: The code requires that the "ROPE GRIPPER
triggered by fault. It is intended that a qualified technician inspect for, and correct any,
malfunction before the car is placed back into service. A dangerous situation can be
produced if a gripper is manually reset without first correcting the cause of the fault.
e.g.: If there has been a brake failure that has not been corrected, when the gripper is
reset, it is very likely that the car will fall either up or down.
UNINTENDED MOTION
•
When at the floor with the doors not in the closed position, relays RG1 and RG2 are de-
energized and relays DZ1 and DZ2 are energized. If the car leaves the floor, DZ1 and DZ2
de-energize, removing power from the "ROPE GRIPPER
the car.
UNINTENDED MOTION RESET
•
Unintended motion reset is accomplished through elevator control circuits. Refer to and
follow the control manufacturer's instructions for "ROPE GRIPPER
IMPORTANT: The code requires that the "ROPE GRIPPER
triggered by fault. It is intended that a qualified technician inspect for and correct any
malfunction before the car is placed back into service. A dangerous situation can be
produced if a gripper is manually reset without first correcting the cause of the fault.
eg: If there has been a brake failure that has not been corrected, when the gripper is reset,
it is very likely that the car will fall either up or down.
MANUAL OPENING
During a power failure the "ROPE GRIPPER
•
gripper will automatically reload and put the elevator back into service. If the car is to be
moved during a power outage, a manual pump is provided to open the "ROPE GRIPPER
•
Turn the valve stem (Figure 4) in the pumping unit to MANUAL. Use the hand pump to
move the "ROPE GRIPPER
hydraulic valve is left in the manually closed position, when power is restored a microswitch
contact will prevent the elevator from running.
CAUTION:
" is constantly maintained. When in the door zone DZ1 and
®
" reset.
®
" towards the loaded position releasing the ropes. If the
®
DURING THE FOLLOWING TESTS PASSENGERS SHOULD BE
PREVENTED FROM ACCESS TO THE ELEVATOR
" OPERATION
®
®
", gripping the ropes and stopping
®
®
" will activate. When power is restored the
®
" is maintained
®
", gripping the ropes
®
" be manually reset if it is
" reset.
®
" be manually reset if it is
®
BULLETIN 1144
Page 15 of 29
11/12/19
".
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