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Front panel
Operation
indicators
Indicators for measured values,
voltages U1, U2 and U3
Indicators for:
Threshold voltage setting U
Threshold voltage setting U
Voltage difference setting ∆U
Phase angle difference setting ∆ϕ
Frequency difference setting ∆f
Operation time setting t
VC
the settings t
and t
check
pulse
Operation time setting t
CB13
Operation time setting t
CB23
Checksum of SGF
Checksum of SGB
Checksum of SGR
Fig.11. Front panel of the synchro-check module type SPCU 3D45.
Both stages have their own operation indica-
tors shown as a number on the digital display.
Further both stages have a common LED op-
eration indicator glowing yellow when the mod-
ule has delivered a closing signal. The indicator
for closing is lit only when the closing signal is
active.
Together with the LED operation indicator a
red operation number 1 or 2 on the display is
indicating which stage has activated the closing
signal. The operation indicator and the opera-
tion number on the display are automatically
Operation Explanation
indication
1
CB13 Active closing signal CB13 from stage 1 to the CB
2
CB23 Active closing signal CB23 from stage 2 to the CB
3
NC13 Failed CB closing attempt from stage 1 (command mode operation)
4
NC23 Failed CB closing attempt from stage 2 (command mode operation)
5
CSF13 Alarm of external command signal CS13 (command mode operation)
6
CSF23 Alarm of external command signal CS23 (command mode operation)
The self-supervision alarm indicator IRF indi-
cates that the self-supervision system has de-
tected a permanent fault. The red LED indica-
tor is lit about one minute after the fault has
been detected. At the same time the plug-in
module delivers a signal to the output relay of
the self-supervision system in the protection
max
min
, the submenu includes
of the circuit breaker
of the circuit breaker
switched off when the stage resets. The alarm
numbers 3, 4, 5 and 6 remain lit on the display
when the alarm situation resets. The alarm num-
bers are acknowledged by the RESET/STEP
push-button. An operation indicator that has
not been acknowledged has no influence on the
relay module operation and the module is con-
tinuously ready for operation.
The following table shows the operation indi-
cations with explanations used in the synchro-
check relay module.
relay assembly. Additionally, in most cases, a
fault code showing the nature of the fault ap-
pears on the display of the module. The fault
code consists of a red digit one and a green code
number. When a fault occurs, the fault code
should be recorded and stated when service is
ordered.
∆
U
Simplified module symbol
∆
f
ϕ
∆
U
U
U
Self-supervision alarm
IRF
2
3
1
indicator
Numerical display
RESET
U
/
U
max
n
STEP
Reset and display step
U
/
U
min
n
push-button
∆
/
U
U
n
ϕ
∆
∆
f
t
VC
t
CB13
t
CB23
PROGRAM
SGF
Setting push-button
SGB
SGR
Closing indicator
Type designation of
SPCU 3D45
the relay module
13
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