2
228-1532 REV 16
081721
KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
www.kepcopower.com
email: [email protected]
FIGURE 1. 24V MODEL PEAK CURRENT REQUIREMENTS
REMOTE ON-OFF.
Remote on-off (X and Y models
only) is via ±RC assigned to pins of the RA 19-(X)B I/O
connector: 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
applicable RA 19-(X)B Manual for details.
CURRENT MONITOR.
Current monitor (C and Y
models 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 2) + 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 output. Refer to the applica-
ble RA 19-(X)B Manual for details.
ALARM CIRCUIT.
Any condition which causes the
unit to be out of specified voltage/current ranges (includ-
ing overvoltage, overcurrent, overtemperature, open
sense line, ac input line failure, etc.) results in an alarm.
All models include an isolated internal relay offering nor-
mally closed and normally open contacts referenced to an
isolated common. These contacts are rated for 1A at 30V
d-c and 0.5A at 125V a-c. These contacts may be used to
configure “close on failure” or “open on failure” alarm cir-
cuits (see Figure 3 for typical alarm circuits). Refer to the
applicable RA 19-(X)B Manual for details about the follow-
ing: 1) normally open (close on failure) contacts are not
available if ±RC is used on X and Y suffix models, 2)
alarm signals are not isolated on C, X and Y models and
3) alarm configurations for multiple power supplies.
KEYING.
Keying of the power supply is established at
the factory. The output voltage determines which keyway
is open. When the corresponding rack adapter key (pin) is
installed by the user, only a power supply of the correct
voltage can be inserted in the rack adapter slot.
FIGURE 2. HSF-PFC 50 WATT POWER SUPPLIES (8) INSTALLED IN RA 19-8B RACK ADAPTER
3043527
I
1
I
2
T
t
D=(t/T)
The standard 24V Model (no options) can supply Peak
current listed in Table 1 if the four conditions listed below
are met. These models include thermal protection, volt-
age shutdown type. Restart by removing a-c input; after
sufficient cooling, reapply a-c input (wait at least 30 sec-
onds).
1. Time: t
10 Seconds
2.
I
1
Peak Current (Amperes)
3. Effective Current:
Rated current (Amperes)
4. Effective Power P
Maximum Power (Watts)
(output RMS current x output voltage)
DI1
2
I
D
–
I2
2
+
