Threshold Values; Operating Principle - ABB CM-UFS.1 Operating And Installation Instructions

IV Function diagrams
a) Over- and undervoltage monitoring
b) Over- and underfrequency monitoring
c) Phase failure monitoring
d) 10 minutes average value monitoring,
CM-UFS.1 (VDE-Version) / CM-UFS.1x
(VDE-Version VFR2013 / VFR2014) only
Control supply voltage / Three-phase measuring voltage
Threshold value
Measuring value
Threshold value
Output relays 1 + 2
Red LED
Red LED
Yellow LED
Start-up delay t prior to first grid connection and after a
S1
short-term interruption, fixed,
CM-UFS.1 / CM-UFS.1x - 30 s, CM-UFS.2 - 1 s
Restart delay t
S2
CM-UFS.1 / CM-UFS.1x - 30 s fixed, CM-UFS.2 - adjustble
Start-up delay t prior to first grid connection and after a
S1
short-term interruption, 30 s fixed

Threshold values

for CM-UFS.1
Overvoltage > 115 % of U s
Undervoltage < 80 % of U s
Overfrequency > 50,2 Hz
Underfrequency < 47,5 Hz
10 min. average value 110-115 % of U s ,
adjustable
Restart delay t 30 s
S2
fixed
for CM-UFS.13
Overvoltage > 115 % of U s
Undervoltage < 80 % of U s
Overfrequency > 50,4 Hz
Underfrequency < 47,5 Hz
10 min. average value 110-115 % of U s ,
adjustable
Restart delay t 30 s
S2
fixed

Operating principle

Over- and undervoltage monitoring
Applying control supply voltage begins the fixed start-up delay
t . When t is complete and all phases are present with correct
S1 S1
voltage and frequency, the output relays energize.
If the voltage to be monitored exceeds or falls below the fixed
threshold value, the output relays de-energize instantaneously. The
fault type is indicated by LEDs. As soon as the voltage returns to
the tolerance range, taking into account a fixed hysteresis of 5 %,
the output relays re-energize after the restart delay t
Over- and underfrequency monitoring
Applying control supply voltage begins the fixed start-up delay
t
S1
voltage and frequency, the output relays energize.
If the frequency to be monitored exceeds or falls below the fixed
(CM-UFS.1 / CM-UFS.1x) or the set (CM-UFS.2) threshold value,
the output relays de-energize instantaneously. The fault type
is indicated by LEDs. As soon as the frequency returns to the
tolerance range, taking into account a fixed hysteresis, the output
relays re-energize after the restart delay t
Phase failure monitoring
Applying control supply voltage begins the fixed start-up delay
t
S1
voltage and frequency, the output relays energize.
They de-energize instantaneously if a phase failure occurs. The
fault is indicated by LEDs. As soon as all 3 phases are present
again, the output relays re-energize automatically after the restart
delay t
10 minutes average value monitoring
(CM-UFS.1 / CM-UFS.1x only)
Applying control supply voltage begins the fixed start-up delay
t
S1
voltage and frequency, the output relays energize.
The voltages of the individual phases are measured over a
period of 10 minutes and the average value is calculated. If the
10 minutes average value of a phase exceeds the set threshold
CM-UFS.2
value, the output relays de-energize instantaneously. The fault is
indicated by LEDs. As soon as the 10 minutes average value drops
> 120 % of U s
again below the set threshold value, the output relays re-energize
< 80 % of U s
instantaneously.
> 50,3 or 51 Hz
< 49,7 or 49 Hz
-
0 s; 0.1 to 30 s
adjustable
CM-UFS.14
> 115 % of U s
< 80 % of U s
> 50,6 Hz
< 47,5 Hz
110-115 % of U s ,
adjustable
30 s
fixed
is complete.
S2
. When t is complete and all phases are present with correct
S1
. When t is complete and all phases are present with correct
S1
is complete.
S2
. When t is complete and all phases are present with correct
S1
English
is complete.
S2
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