ABB UMC100-FBP Technical Description page 53

Universal Motor Controller
UMC100-FBP
Technical Description
Power Factor and Power Supervision
The power factor and the active power are important values to detect underload or no-load situations
in applications where a change of the load is not equally reflected in a change of the motor current (e.g.
small pumps, conveyor belts etc.). For the supervision of the power factor a warning and a trip threshold
is available.
The power factor together with the motor current and the supply voltage are the basis to calculate the real
power consumed by the motor. Warning and trip thresholds can be set both for overpower and under-
power supervision.
The power factor and power supervision functions are disabled in test position and if a voltage dip was
detected.
An adjustable inhibit time is available to inhibit the load supervision functions after load start. This can be
used for example to allow a pump to built up pressure before the power protection becomes active. The
diagram below shows the startup of a motor and the activation of the underload protection function.
 The load startup delay time allows to delay the low-power protection functions at start-
up. This can be used for example to allow a pump to built up pressure before the low power
protection becomes active.
FieldBusPlug / Issue: 03.2012
It is not necessary to specify the nominal power of the motor. The UMC100 internally
calculates it as follows:
P = I * U * cosphi
nominal e e
The warning and trip tresholds for the under - and overpower protection are therefore
defined as percentage in relation to P
Trip Level' is set to 80%' the motor will be tripped if the measured real power falls
below 1.6kW.
Use either the cos phi or the active power for low load supervision. It is not recom-
mendet to use both at the same time.
I/I
n
100%
Motor start
Motor running
Load startup delay
* 1,732
nominal
. Example: P = 2kW. If the parameter 'P Low
n n
Power and
cosphi supervision
active
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UMC100-FBP