KEPCO RA 19-1U Operator Manual - Manual (Page 41)

RA 19-1U 020413
2-25
2.10.1 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.
2.10.2 SOURCE POWER CONNECTIONS
When used in conjunction with Kepco 1U 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. Slots 1 and 3 are powered from one terminal block, slots 2
and 4 are powered from the other.
CAUTION
THE RA 19-1U DOES NOT INCORPORATE ANY SAFETY INTERRUPT DEVICES. PROTEC-
TION OF INPUT WIRING REQUIRES USER-CONFIGURED SAFETY INTERRUPTS.
The terminals are labeled L, N, and G. Wires must be sized according to expected current. Wire
size range is 24-14 AWG; torque to 4 lb-in (0.4 N•M) maximum. Their functions are as follows:
• Terminal G (Ground) is the safety ground connection for the RA 19-1U. It is connected
to the RA 19-1U 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 1U 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.
When each terminal block receives power from a separate source, input redundancy for adja-
cent pairs of power supplies is achieved.
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.
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 RA 19-1U 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.