11
An unwanted operation of the undervoltage
stage when the miniature circuit breaker trips
has been inhibited by routing a control voltage
from the auxiliary contact of the MCB to the
relay's control input 10-11. Switch SGB/5 on
the printed circuit board must be in position 1
as also switch SGR/1.
The selector switches of the voltage relay SPAU
130 C can be set as follows:
Switch SG1/SPCU 3C14 SGB/SPCU 3C14 SGR
1 0 three-phase 0 not in use 1 control signal from minia-
ture circuit breaker (MCB)
2 1 U> start time = 30 s 0 not in use 1 start signal of stage U< to
output relay D
3 1 U> inverse charact. 0 not in use 1 start signal of stage U> to
output relay D
4 0 0 not in use 0 no trip signal of stage U< to
curve A output relay D
5 0 1 blocking of stage t< 1 trip signal of stage U< to
output relay C
6 1 U< stage blocked, 0 not in use 0 no trip signal of stage U< to
if U < 20% x U
n
output relay A
7 1 U< start time = 30 s 0 not in use 1 trip signal of stage U> to
output relay C
8 1 t< = 10...120 s 0 not in use 0 no trip signal of stage U> to
output relay B
Σ 230
When the switches are set as above, the output
relays of the voltage relay SPAU 130 C provide
the following signals:
Contact Function
65-66 Tripping of the circuit breaker on the high-voltage side of the transformer (U>)
68-69 Tripping of the circuit breaker on the low-voltage side of the transformer (U<)
80-81 Signal on tripping (U> and U<)
77-78 Starting (U> and U<)
70-71-72 Self-supervision
A prewarning of a voltage disturbance is ob-
tained over the contact interval 77-78 and a
signal on tripping of stage U> or U< is obtained
over the contact interval 80-81. When the over-
voltage stage or the undervoltage stage starts or
operates the start indicator (yellow) or operation
indicator (red) of the concerned stage is lit. If the
indicators are selfreset they are switched off
when the measured voltage returns. If the indi-
cators are latching they have to be reset manually
with the reset push-button on the front panel or
by remote control via the serial port.
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