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Section 1
General Information
5-6 Set-Up Information MN770
Recommended Power Up/Down Sequence for Elevators Using Inverter Controls
The following is a recommended sequence for turning on and off the elevator drive and
external OEM controller. Figure 5-5 shows this sequence.
1. Close the M-Contactor.
2. Close the drive ENABLE.
3. Use the DRIVE ON opto output to energize an external coil for a relay to
perform the following:
a. Signal the OEM elevator controller, computer or PLC to engage or
disengage the holding brake and feed the speed command reference
(pattern generator) signal into the drive. There should be a 50 mSec
(milli-second) delay between the brake release signal and the speed
command signal. This allows time to release the brake mechanically.
b. The time between DRIVE ON and the ENABLE signal allows flux to build
up in the AC motor. This delay should be at least 20 mSec.
4. An inverter drive will not hold the car in position until the brake is set. When the
car reaches the floor, open the J4-8 ENABLE and J4-11 STOP inputs at the
same time.