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Universal Motor Controller
UMC100-FBP
V 6
Technical Description
Voltage Dips, Load Shedding
Motors switched off during voltage dips or power failure can be restarted on power resumption sequen-
tially to prevent simultaneous switch-on of the motors and thus prevent another mains failure on the
network. The tripping of motors due to undervoltage of short duration can be bypassed. It is also possible
to restart the process on power resumption by sequentially starting the motors (staggered start).
External
Voltage
Monitor
The following diagram shows different cases. In case a) where the voltage dip is shorter than the Auto
Restart Time the UMC output relay does not open. The motor keeps running.
In case b) the voltage dip takes longer than the conigured Auto Restart Time which means the UMC
switches off the relay output. The dip is shorter than conigured with parameter 'Max. Voltage Dip Durati-
on' so the motor gets started automatically after an optional restart delay time (Parameter 'Dip Autorestart
Enable=On).
In case c) the voltage dip takes longer than the Max. Voltage Dip Duration time. Therefore an error is gen-
erated as soon as the dip duration exceeds the allowed dip duration time.
Case a)
UMC Relay Out
DIP signal at
digital input
FieldBusPlug / Issue: 11.009
The Voltage DIP function is available for the starter types DOL (Direct Online Starter)
and REV (Reversing Starter).
L1
L
L3
U
Lmin
Reset
Level
Trip
Level
Undervoltage situation
UMC100
DI0-
Auto Restart Window
- 43 -
UMC100-FBP
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