KEPCO RA 19-4B - Manual (Page 32)

2-22
RA 19-4B 011409
2.8.2 SOURCE POWER CONNECTIONS
CAUTION
THE SERIES RA 19-(X)B DOES NOT INCORPORATE ANY SAFETY INTERRUPT DEVICES.
PROTECTION OF INPUT WIRING REQUIRES USER-CONFIGURED SAFETY INTERRUPTS.
When used in conjunction with Kepco HSF series power supplies, these rack adapters can be
operated from single phase 95-264V a-c or 125-370V d-c source power without adjustment or
modification. Source power is applied to two 3-terminal terminal blocks at the rear panel and
distributed as indicated in Figure 1-3. Wires must be sized according to expected current. Wire
size range is 20-10 AWG; torque to 6 lb-in (0.6N•M) maximum. The terminal positions are
labeled L, N, and G. Their functions are as follows:
• Terminal G (Ground) is the safety ground connection for the Series RA 19-(X)B. It is
connected to the Series RA 19-(X)B chassis and to the safety ground terminal of the
input power connector for each of the power supply mounting positions via the PCB
backplane. Terminal G must be connected to safety ground in order to ensure proper
grounding of the HSF power supplies.
• Terminals L (Line Phase) and N (Neutral) are connected to the input power entry con-
nectors. Source power is provided to the power supplies indicated by the label on the
rear panel. The source power connectors are independent of each other, allowing the
user complete flexibility in wiring for common or redundant input power configurations.
The following standard wiring configuration is recommended by Kepco as being compliant with
applicable national and international safety standards. Please consult local electrical codes for
wire current ratings and other specific requirements:
• Connect Terminal G of each Series RA 19-(X)B input power terminal block to safety
ground
• Connect a separate wire pair from each side of the input power to the L/N terminal pair of
the input power terminal block.
• Where 115V a-c source power is used, Kepco recommends the use of the line cords,
P/N 118-0506 supplied (North American style plug, 15A maximum, 6 ft. long).
• Wire size is determined by the maximum rated source current for each HSF power sup-
ply and the number of power supplies installed. For lower system power configurations,
smaller wire can be used; contact Kepco Applications Engineering for assistance.
2.8.3 CONTROL SIGNAL CONNECTIONS
Access to the control signal (I/O) connector for each HSF power supply is provided via the 15-
pin D-subminiature connectors on the rear panel of the rack adapter (see Figure 1-4). Two mat-
ing connectors (Kepco P/N 142-0449) are provided in a plastic bag. Consult PAR. 2.4 and the
HSF operator's manual for instructions on wiring and use of these control lines.