System Options
5-60 Manual # 42-02-7223
Verifying the zero calibration (empty car weight)
It is recommended to verify the zero calibration if:
1. When working with new ropes, the calibration may change slightly as the ropes settle.
After the first 30 days of operation it is recommended to check the empty car weight,
with the car in the middle of the hoistway, using the display on the EMCO Load
Weigher. If the empty car weight has changed (no longer zero), at a minimum the empty
car weight should be re-learned (steps 1 through 5 of the calibration procedure).
2. If the car experiences violent motion, e.g. emergency stop or car / counterweight con-
tacts the buffers, it is recommended to check the empty car weight, with the car in the
middle of the hoistway, using the display on the EMCO Load Weigher. If the empty car
weight has changed (no longer zero), at a minimum the empty car weight should be re-
learned (steps 1 through 5 of the calibration procedure).
Troubleshooting
1. Check for Err codes on the display.
= Bad load cell connection or damaged load cell. Verify that the load cells are
connected to the control unit per the wiring diagram. Inspect the cables for cuts or bro-
ken wires.
= Negative load cell flow. Verify that the load cell connections to the control unit
are per the wiring diagram.
= Positive load cell flow. Load cells are to small for the application and must be
replaced with proper units.
= Polarity error. Verify that the load cell connections to the control unit are per
the wiring diagram. Reprogram the control.
= MB-D display short. Locate the short. Disconnect MB-D display, turn off the
control and reconnect the MB-D display.
= Loss of data in memory. Reprogram the control.
2. Verify that proper voltage is being supplied to the control unit.
3. Check all of the connections to the control unit.
4. Check the fuse. To check fuse: Disconnect power to the control unit. Open the control
unit by removing the five (5) screws that hold the cover. Remove fuse from vertical free
mounting (black) fuse holder next to controller transformer and replace with new fuse if
necessary.
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