Emergency Start; Checkback Monitoring; Limit The Number Of Starts - ABB UMC100.3 Manual

C O N F I G U R I N G T H E M OTO R M A N A G E M E N T F U N C T I O N S

Emergency Start

In some special cases a motor must be started even if the thermal overload protection would prevent the start (i.e. cooling time is
still running). To allow the start in such situations the thermal memory of the UMC can be reset to cold state. This enables an imme-
diate restart even after a thermal overload trip.
There are two possibilities for an emergency start: Using the multifunction inputs DI0, DI1 or DI2 an emergency start is carried out
as follows:
1. Set parameter "Emergency Start = On" (default is Off)
2. Parameterise DI0, DI1 or DI2 as emergency start input
3. Switch the signal on the parameterised input to 1:
- 0 -> 1 transition to reset the UMC100.3 thermal memory to "cold motor"
- Continuous 1-signal to ignore fault signals on multi-function inputs (if parameterised as fault inputs)
- Switch on motor
To perform an emergency start from the control system / fieldbus, the following steps must be carried out:
1. Set parameter "Emergency Start = On" (default is Off)
2. Send command PREPARE EMERGENCY START 0->1 transition via fieldbus to reset the UMC100.3 thermal memory
to „cold motor".
A continuous 1-signal ignores fault signals originating from the multi-function inputs (if parametrized as fault inputs)
3. Switch on motor
Caution: Starting a hot motor can cause motor damage or destruction of the motor.
Relevant Parameters:
• Emergency Start
• Multifunction 0,1,2

Checkback Monitoring

Limit the Number of Starts

This function allows to limit the number of starts within a defined time window. The length of the window can be set with the para-
meter "Num Starts Window". The numbers of permissible starts in this window can be set with parameter "Num Starts Allowed".
If there is only one start left a user defined reaction can be triggered. See parameter "Num Starts Prewarn".
If no start is left anymore but a start command is given a user defined reaction can be triggered.
See parameter "Num Starts Overrun".
An optional pause time "Num Starts Pause" can be set to define a waiting time after the motor was stopped that has to pass until a
new start is possible. The running pause time is indicated with a flashing "t" symbol on the LCD panel. The remaining time until a
new start is possible can be also displayed on the LCD panel and sent via fieldbus.
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