KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
http://www.kepcopower.com
email: [email protected]
083013
228-1563 REV 10
3
FIGURE 2. HSF-1UR 50 WATT POWER SUPPLIES (4) INSTALLED IN RA 19-1U RACK ADAPTER
REMOTE ON-OFF.
Remote on-off (X and Y models
only) is via ±RC assigned to pins of the RA 19-1U I/O con-
nector: off = no voltage, short circuit, or 0 to 0.8V, on = 4.5
to 12.5V (or 12.5 to 24.5V via 1.5K Ohms). To reverse on-
off polarity contact Kepco. There is no isolation between
±RC, d-c output and alarm circuit. Refer to the RA 19-1U
Manual for details. NOTE: POWER switch must be ON for
remote control to be active.
CURRENT MONITOR.
Current monitor (C and Y mod-
els only) is via ±IMON assigned to pins of the RA 19-(X)B
I/O connector. Monitored Output Current (Amps) = Voltage
drop across R
EQ
(mVolts) / R
EQ
(mOhms) where R
EQ
is the
sum of R
S
(see Table 1) + trace resistance to point where
current monitor is connected, approximately 4mOhms. The
voltage drop across R
EQ
is measured across ± IMON pins
(requires millivoltmeter, range 0 to 250mV). Accuracy is
±10%; contact Kepco if greater accuracy is required. There
is no isolation between ±IMON, alarm circuit and d-c out-
put. Refer to the applicable RA 19-1U Manual for details.
ALARM CIRCUIT.
The HSF-1UR includes an isolated
internal relay offering normally closed and normally open
contacts referenced to an isolated common (see above for
isolation restrictions for remote on-off or current monitor
options. These contacts may be used to configure “close
on failure” or “open on failure” alarm circuits (“close on fail-
ure” not available for X and Y models). (Refer to the
RA 19-1U Manual for alarm configurations for multiple
HSF-1UR power supplies.)
KEYING.
Keying of the HSF-1UR is established at the
factory (see Figure 3). The output voltage determines
which key pins are installed. When the proper holes in the
rack adapter are blocked by keying screws installed by the
user, only a power supply of the correct voltage can be
inserted in the rack adapter slot. (Refer to the RA 19-1U
Manual for rack adapter keying instructions.)
FIGURE 3. REAR CONNECTOR AND KEYING
PS2
PS1
3042496
PS4
PS3
