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value
=
M axDeviation
(
U
12
, U
23
, U
31
)
Average
(
U
12
, U
23
, U
31
))
U
imbalance
=
U
xy
/U
e
<
10%
→
0%
value
≥
20
→
20%
value <
20
→
value
U
L1L2
U
L2L3
U
L3L1
Min
U > U high
warn level
U > U high
trip level
U < U low
warn level
U < U low
trip level
U high
warn delay
U high
trip delay
U low
warn delay
U low
trip delay
Imbalance
Calculation
U
imb
> U imb.
warn level
U
imb
> U imb.
trip level
U imb.
warn delay
U imb
trip delay
Delay
1)
Phase
loss
detection
Voltage Phase
Loss
Overvoltage Warn
Overvoltage Trip
Undervoltage Warn
Undervoltage Trip
Voltage Imb. Warn
Voltage Imb. Trip
&
&
&
&
&
&
&
Voltage dip
Disable
>
Max
THD MAX
Calculation
THD >
warn level
THD warn
&
1)
delay = dip duration or dip autorestart delay (the longer time is used for the delay)
Voltage based Protection Functions
The following block diagram provides an overview of the signal flow related to voltage supervision and protection. The different
voltage protection functions are usually always active (also if the motor is in stop mode). There are two exceptions a) if the UMC is
in test position and b) if a voltage Dip was detected.
—
Signal flow of the voltage based protection and monitoring functions
Imbalance
An imbalance can appear because of different reasons. For example because of a network imbalance or because of high contact re-
sistances in the wiring of a phase. Even small voltage imbalances causes high current imbalances. The imbalance value is calculated
as follows (max. deviation (U12,U23,U31) is the maximum deviation phase voltage from the average voltage value):
:
Total Harmonic Distortion
This function measures harmonic distortions in the connected mains and provides a value for Total Harmonic Distortion THD. Har-
monic distortions can be caused by variable speed drives or other electronic devices. High harmonics can result in accelerated de-
gradation of insulation and loss of service life of a motor. In case of distortions above the adjustable warnlevel, it is recommended
to check the supply mains for faults or noisy equipment. The THD is defined as the ratio of the sum of the powers of all harmonic
components to the power of the fundamental frequency.
A threshold can be set to trigger a warning if the THD is too high.
51
CO N FI G U R I N G T H E M OTO R P R OT EC T I O N FU N C T I O N S
Содержание UMC100.3
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