BULLETIN 1166
9/4/2015
Page 12 of 20
DZC1 DESCRIPTION
DZ1 is energized in the door zone and de-energized outside of the door zone (See Diagram
3
NOTE). Maximum door zone is 10"
DZC2 DESCRIPTION
Circuits for DZ2 function are identical to DZ1 except a separate door zone signal is utilized.
If the above circuits (Diagram 3
)
do not make contact when required, the elevator must be
prevented from running. If other types of relays are used, circuits must prove that contacts from
RG1, RG2, DZ1 and DZ2 are functioning properly and when a failure is detected the elevator
must be prevented from running.
HOLLISTER-WHITNEY “ROPE GRIPPER™” OPERATION
NORMAL OPERATION
Power to the “ROPE GRIPPER™” is constantly maintained. When in the door zone DZ1 and
DZ2 provide power to the “ROPE GRIPPER™” RG1 and RG2 energize when the doors
close. As the car leaves the floor DZ1 and DZ2 de-energize, power to the “ROPE
GRIPPER™” is maintained 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™”, clamping the ropes
and stopping the car.
OVERSPEED RESET
Overspeed reset is accomplished by resetting the Governor overspeed switch and the elevator
control circuits. Refer to and follow the controller manufacturer’s instructions for “ROPE
GRIPPER™” reset.
IMPORTANT:
The code requires that the “ROPE GRIPPER™” be manually reset if it
is 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 “ROPE 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
“ROPE 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 open, 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™”, clamping the ropes and stopping 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™” reset.
IMPORTANT:
The code requires that the “ROPE GRIPPER™” be manually reset if it
is 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 “ROPE 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
“ROPE GRIPPER™” is reset, it is very likely that the car will fall either up or down.
