13
Front panel
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
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.
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
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.
Operation
indicators
Fig.11. Front panel of the synchro-check module type SPCU 3D45.
Indicators for measured values,
voltages U1, U2 and U3
Indicators for:
Threshold voltage setting U
max
Threshold voltage setting U
min
Voltage difference setting ∆U
Phase angle difference setting ∆ϕ
Frequency difference setting ∆f
Operation time setting t
VC
, the submenu includes
the settings t
check
and t
pulse
Operation time setting t
CB13
of the circuit breaker
Operation time setting t
CB23
of the circuit breaker
Checksum of SGF
Checksum of SGB
Checksum of SGR
SGB
SGF
SPCU 3D45
PROGRAM
RESET
STEP
IRF
1
U
0108A
2
U
3
U
U
∆
f
∆
ϕ
∆
U
∆
ϕ
∆
f
∆
max
U
n
U
/
min
U
n
U
/
t
n
U
/
VC
SGR
t
CB13
t
CB23
Simplified module symbol
Self-supervision alarm
indicator
Numerical display
Reset and display step
push-button
Setting push-button
Closing indicator
Type designation of
the relay module
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