KEPCO BOP 5-20DL, Operator'S Manual

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BOP 5-20DL 081915
1.4.4 LOAD REACTANCE
The BOP 5-20DL power supply is optimized for driving large inductor loads (L suffix). Factory
test were performed with loads up to 1H, however higher values are possible.
CAUTION: When driving heavy inductive loads with high currents, it is possible for the
BOP and the load to be damaged by an A-C input power loss which prevents
the load's stored energy from being dissipated inside the BOP. To avoid pos-
sible damage observe the following:
• Use UPS to supply the BOP.
• Set BOP output current and/or voltage to zero and turn off the BOP after
the output current actually reaches a zero value.
• Use properly rated (voltage and current) bipolar transorbs or a properly
rated bipolar crowbar element connected directly at the output of the
BOP. An alternative is a Normally-Closed Contactor connected across the
output of the BOP. These options may also be combined.
When driving an inductive load, if the system becomes unstable at the crossover between volt-
age limit mode and current mode, the BOP 5-20DL can be further optimized by reducing the
current loop bandwidth. This can be accomplished by connecting a ceramic capacitor across
pins 16 and 18 of the Rear Programming Connector (see Figure 3-1 and Table 1-6). Refer to
Table 1-8 for bandwidths resulting from typical capacitor values.
1.4.5 REMOTE TURN-OFF
Remote turn-off of the BOP, equivalent to tripping the front panel ON/OFF circuit breaker to
OFF, can be accomplished by a contact closure, or by an optically isolated signal.
1.4.6 CIRCUIT BREAKER SHUTDOWN PREVENTION (AT POWER LOSS) CIRCUIT
See PAR. 3.6.2.
1.4.7 REFERENCES
Two reference/bias sources (±10V at 4 mA max.) are provided for control and biasing purposes.
These reference sources are available at the rear programming connector (with reference to the
“COMMON” terminal). Their specifications are tabulated In Table 1-3.
1.4.8 SERIES OR PARALLEL OPERATION
See PAR. 3.6
TABLE 1-8. CURRENT LOOP BANDWIDTH REDUCTION BY ADDING COMPENSATION
CAPACITOR TO REAR PROGRAMMING CONNECTOR (RESISTIVE LOAD)
Ceramic Capacitor Value connected across Rear Programming Connector pins 16 and 18
0.01

F 0.022

F 0.047

F 0.1

F 0.22

F 0.47

F 1.0

F
3dB Bandwidth 2.1KHz 1.7KHz 1.1KHz 0.6KHz 0.31KHz 0.12KHz 0.06KHz
!