ABB CM serie Betriebs- Und Montageanleitung Seite 11

Operating principle
The current window monitoring relays CM-SFS.2 can be used for
the simultaneous monitoring of over- ">I" and undercurrents "<I" 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 undercurrent monitoring.
The current to be monitored (measured value) is applied to
terminals B1/B2/B3-C. Open
as well as an adjustable ON
selectable.
ON-delayed A current window monitoring with parallel
switching c/o contacts j
If the measured value exceeds or drops below the adjusted
threshold value before the set start-up delay T
output relays do not change their state.
If the measured value exceeds or drops below the adjusted
threshold value when T is complete, the tripping delay T
S
A
when is configured. If T
is still exceeding or below the threshold value minus / plus the
fixed hysteresis (5%), the output relays energize
g
.
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 voltage
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 current window monitoring with parallel
switching c/o contacts j
If the measured value exceeds or drops below the adjusted
threshold value when the set start-up delay T
h
output relays energize
gured, and remain in this position during the set tripping delay T
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.
">I" = 11 -12 /14 ; "<I" = 21
15 16 18
h
or closed-circuit principle
A B
or OFF tripping delay are
is complete, the
S
is complete and the measured value
V
h
/de-energize
h
/ energize
f
the output relays remain
is complete, the
S
g B
/ de-energize , when
starts. After completion
V
h g
/ energize
e
. With activated
g
and energize only, when
-22 /24
25 26 28
Function diagrams
V
Current window monitoring, 1 x 2 c/o
ON-delayed
VI
Current window monitoring, 1 x 2 c/o
j
can
OFF-delayed
VII
Current window monitoring, 1 x 2 c/o
g
ON-delayed
VIII Current window monitoring, 1 x 2 c/o
OFF-delayed
IX
Current window monitoring, 2 x 1 c/o
ON-delayed
X
Current window monitoring, 2 x 1 c/o
OFF-delayed
XI
Current window monitoring, 2 x 1 c/o
ON-delayed
starts,
XII
Current window monitoring, 2 x 1 c/o
V
OFF-delayed
Control supply voltage
Threshold value max.
Hysteresis
Measured value
g
.
Hysteresis
Threshold value min.
Open-circuit principle
g
and
Output relay 1
Output relay 2
green LED
red LED
yellow LED
Closed-circuit principle
is confi-
.
V
If the adjusted „threshold value max." minus the hysteresis is
< „threshold value min." plus the hysteresis, all LEDs flash
synchronously. The function of the output relays remains
unchanged.
, provided
h
and
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
11