ABB UMC100-FBP User Manual

- 55 - UMC100-FBP
Universal Motor Controller
UMC100-FBP
Technical Description
FieldBusPlug / Issue: 03.2012
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).
The Voltage DIP function is available for the starter types DOL (Direct Online Starter)
and REV (Reversing Starter).
When using the voltage dip function take care about the availability of the contactor
supply voltage and the contactor fallback. Set the check back delay time > the auto
restart window to avoid trips before the UMC has switched off the contactor if the
dip is longer than the auto restart window.
During a voltage DIP the UMC inhibits low voltage, low cos phi and low power warn-
ings and errors. Nevertheless set a sufficient delay time of e.g. min. 0.5s for these
functions to avoid conflicts with the voltage dip function.
During a voltage dip the supply voltage of the UMC itself must be available!
For special applications where the supply voltage is switched off too you can cre-
ate an own function block application using the function block editor and using the
function block 'Non Volatile SR'. This block allows to save its output state over a
power cycle.
The load shedding logic can be triggered
a) from the VI15x voltage module. See upper part of the diagram below.
b) from an external voltage monitor signalling the low voltage situation to several devices. See lower part
of the diagram below. No VI15x module is needed in this case.
The following diagram shows both solutions.
External
Voltage
Monitor
UMC100
24VDC
UMC100
VI15x
L1/L2/L3
UMC100
UMC100
VI15x
....
....
.. ..
DI0-2 DI0-2
L1/L2/L3
 A low voltage situation can be detected either by the VI15x module or using an external
voltage monitoring relay. In the latter case the low voltage signal has to be wired to all motor
controllers.

ABB UMC100-FBP Specifications

General

Brand	ABB
Model	UMC100-FBP
Category	Controller
Language	English