KEPCO RA 19-4C Operator Manual - Manual (Page 52)

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RA 19-4C 121013
ment. If optimum performance is expected, certain rules for the interconnection of source,
power supply and load must be observed by the user. These rules are described in detail in the
following paragraphs and in the operating instructions for HSF Series power supplies.
2.11.1 SAFETY GROUNDING
Local, national and international safety rules dictate the grounding of the metal cover and case
of any instrument connected to the a-c power source, when such grounding is an intrinsic part of
the safety aspect of the instrument. The instructions below suggest wiring methods which com-
ply with these safety requirements; however, in the event that the specific installation for the
power system involves differences with the recommended wiring, it is the customer's responsi-
bility to ensure that all applicable electric codes for safety grounding requirements are met.
2.11.2 SOURCE POWER CONNECTIONS
The RA 19-4C rack adapter is designed to be used in conjunction with Kepco HSF series power
supplies. Source power requirements are determined by the HSF power supply (see HSF power
supply Instruction Manual); no adjustment or modification of the rack adapter is required.
Source power is applied to two 3-terminal terminal blocks at the rear panel and distributed as
indicated in Figure 1-3. Slots 1 and 3 are powered from one terminal block, slots 2 and 4 are
powered from the other. When each terminal block receives power from a separate source,
input redundancy for adjacent pairs of power supplies is achieved.
CAUTION
DO NOT EXCEED MAXIMUM TERMINAL BLOCK RATING OF 500V AT 36A.
Source power can also be custom configured via jumpers on the internal PC board, e.g., all
slots can be powered from a single terminal block, or slots 1 and 2 can be powered from one
terminal block and slots 3 and 4 from the other. Contact Kepco Applications Engineering for fur-
ther details.
CAUTION
THE RA 19-4C DOES NOT INCORPORATE ANY SAFETY INTERRUPT DEVICES. PROTEC-
TION OF INPUT WIRING REQUIRES USER-CONFIGURED SAFETY INTERRUPTS.
Wires must be sized according to expected current. Wire size range for each terminal block is
AWG 20-10/IEC, rigid: 0.5 - 6mm
2 , or flexible (stranded): 0.5 - 4mm 2 ; torque to 6 lb-in (0.6 N•M)
maximum. The terminals are labeled L, N, and G. Their functions are:
• Terminal G (Ground) is the safety ground connection for the RA 19-4C. It is connected
to the RA 19-4C 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.