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Operating principle
The voltage window monitoring relay CM-EFS.2 can be used for the
simultaneous monitoring of over- ">U" and undervoltages "<U" in
single-phase AC or DC systems. Depending on the configuration,
i
one c/o contact each
or both c/o contacts in parallel
be used for the over- and undervoltage monitoring. The voltage to
be monitored (measured value) is applied to terminals B-C. Open
h
or closed-circuit principle
A
B
or OFF
tripping delay are selectable.
ON-delayed A voltage window monitoring with parallel
switching c/o contacts j
If the measured value exceeds or drops below the adjusted
threshold value, the tripping delay T
configured. If T
is complete and the measured value is still
v
exceeding or below the threshold value minus / plus the fixed
hysteresis (5%), the output relays energize
If the measured value exceeds or drops below the threshold
value plus / minus the hysteresis and the latching function is not
e
activated
, the output relays de-energize
With activated latching function
h
energized
and de-energize only, when control supply vol tage
is interrupted / the output relays remain de-energized
energize only, when control supply voltage is switched off and then
again switched on = Reset.
OFF-delayed B voltage window monitoring with parallel
switching c/o contacts j
If the measured value exceeds or drops below the adjusted
threshold value, the output relays energize
B
when
is configured, and remain in this position during the set
tripping delay T
.
v
If the measured value exceeds or drops below the threshold value
plus / minus the fixed hysteresis (5%) and the latching function is
e
not activated
, the tripping delay T
of T
, the output relays de-energize
v
that the latching function is not activated
f
latching function
the output relays remain energized
de-energize only, when control supply voltage is interrupted / the
output relays remain de-energized
control supply voltage is switched off and then again switched on
= Reset.
i
When
is adjusted on the device, the functionality is equivalent
to the one described above. There is only to consider that in this
case, instead of both output relays, only one output relay each will
be switched.
">U" = 11
-12
/14
; "<U" = 21
15
16
18
j
g
as well as an adjustable ON
A
starts, when
v
h
/de-energize
h
/ energize
f
the output relays remain
g
h
/ de-energize
starts. After completion
v
h
g
/ energize
, provided
e
. With activated
h
g
and energize only, when
-22
/24
25
26
28
Function diagrams
V
Voltage window monitoring, 1 x 2 c/o
ON-delayed
VI
Voltage window monitoring, 1 x 2 c/o
can
OFF-delayed
VII
Voltage window monitoring, 1 x 2 c/o
ON-delayed
VIII Voltage window monitoring, 1 x 2 c/o
OFF-delayed
IX
Voltage window monitoring, 2 x 1 c/o
ON-delayed
is
X
Voltage window monitoring, 2 x 1 c/o
OFF-delayed
g
.
XI
Voltage window monitoring, 2 x 1 c/o
ON-delayed
XII
Voltage window monitoring, 2 x 1 c/o
g
.
OFF-delayed
Control supply voltage
and
Threshold value max.
Hysteresis
Measured value
Hysteresis
Threshold value min.
Open-circuit principle
g
,
Output relay 1
Output relay 2
green LED
red LED
yellow LED
Closed-circuit principle
and
If the adjusted „threshold value max." minus the hysteresis is
< „treshold value min." plus the hysteresis, all LEDs flash
synchronously. The function of the output relays remains
unchanged.
j
A
e
without latching
j
B
e
without latching
j
A
f
with latching
j
B
f
with latching
i
A
e
without latching
i
B
e
without latching
i
A
f
with latching
i
B
f
with latching
h
g
English
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