Prepare for Inspection Operation
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2
Motion 4000
Seismic Equipment
A “ring and string” circuit detects excessive counterweight motion caused by a seismic distur-
bance. When motion is detected, the car will make a full stop. After stopping, the car will move
to and level at the next available floor in the direction away from the counterweight. After level-
ing, the car will open its doors and allow passengers to exit.
Modes of operation other than Automatic, for example Fire Phase II or Attendant mode, allow
different operating options when potential counterweight derailment has been detected.
Your job may also use a lateral and/or vertical acceleration sensor to detect seismic activity. At
this point, you should install counterweight movement detection and seismic sensors in accor-
dance with your job prints and seismic monitor manufacturer instructions.
Figure 2.14 Seismic Equipment
Counterweight Displacement
Kit:
Two steel cables run parallel
to counterweight guide rails,
passing through a pair of
eyebolts on the counter-
weight. If the counterweight
moves laterally, the cable
touches the ring, completing
the circuit and providing an
alert to the controller.
Seismic Detector:
Detects and records vertical and hori-
zontal seismic movement. Peak accel-
eration along each axis is detected
and stored for up to 15 seismic
events. The easy to read LCD displays
real time acceleration and angle of
deflection.
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