KEPCO BOP 5-20DL, Operator'S Manual

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BOP 5-20DL 081915
3-23
• A manual, non-isolated turn-off is provided which, when implemented with an external
switch contact as shown in Figure 3-25, will energize the diode in the first optocoupler
(LC-1). thus providing the SCR turn-on.
• If it is not desired to trip the circuit breaker (CB101) upon a-c line power loss, it can be
prevented by a jumper wire or an external switch across terminals 24 and 25 on the Rear
Programming Connector. In this manner, Q1 is inhibited from providing a turn-on signal
for Q2, thus avoiding triggering the SCR and tripping the circuit breaker.
FIGURE 3-25. CIRCUIT BREAKER CONTROL CIRCUIT, SIMPLIFIED DIAGRAM.
3.6.3 PARALLEL CONNECTION, MASTER/SLAVE OPERATION
BOP power supplies can be connected in parallel to increase output current. One parallel-con-
nection limitation is the load-wire size required for larger output current. Contact Kepco if more
than three units in parallel are required.
+
+
DRIVER
COLLECTOR
SUPPLY
CR4
COM
LC1
+5V
FAST
TURN OFF
ON
POWER LOSS
Q1
Q2
COMMON
PART OF
CB101
COMMON
26 36 24 25 47 49 23 41
LC2
TO
DRIVER
ASSEMBLY
(A3)
THERMO
SWITCH
ON A4
PART OF
REAR PROGRAMMING
CONNECTOR
TURN-OFF
SIGNAL
OUTPUT
ISOLATED
TURN-OFF
( ) (+)
MANUAL
NON-ISOLATED
TURN-OFF
EXTERNAL SWITCH CLOSURE
PREVENTS CIRCUIT BREAKER
TRIP UPON POWER FAILURE
(+) ( )
FROM ANOTHER BOP
THIS SIGNAL, APPLIED AS SHOWN,
WILL CREATE A FAILURE DETECTION LOOP
CIRCUIT BREAKER
CONTROL
3043714
R4