HSF(A) 600W 040215
11
FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
3.5
REMOTE ON-OFF
When power is ON at the source, the output may be turned ON or OFF using the ±RC signals if
the remote ON-OFF feature is enabled. Note that when remote ON-OFF is enabled, the RESET
OUTPUT switch does not function. Remote ON-OFF is enabled by setting DIP switch positions 3
and 4 as shown in Figure 8B. The +RC and –RC signals (at the rack adapter I/O connector, pins
15 and 8, respectively) then turn the unit on or off.
These pins accept a logic level (2.4V to 12V maximum for “high” and 0.0 to 0.8V for “low”), or a
contact closure. When the ±RC pins are open, using either a mechanical switch or a high level
logic signal, the HSF (A, AM) 600W output is cut OFF. When the ±RC pins are shorted, the output
returns to within specifications. At low level logic, the maximum sink current is 3.5mA.
Positions 3 and 4 of both DIP switches must be restored to the factory default setting (Figure 8A)
if remote ON-OFF is not used.
NOTE: The +RC pin is not isolated from DC output. –PF and –RC are connected together
and cannot be isolated from each other (unlike earlier (non A) HSF 600W models).
This return is connected to the power supply –OUTPUT. Please contact Kepco if appli-
cation requires remote control to be isolated from DC output or from PF signal.
TABLE 5. MINIMUM CONDITIONS FOR RELAY, METER AND LED OPERATION
HSF A, AM MODEL
12-53A, AM
15-43, AM
24-27A, AM
28-23A, AM
48-13A, AM
For HSF A and AM models, minimum output voltage
required for continuous alarm relay, meter (AM Models
only) and VDC ON indicator functioning (Volts d-c)
(1)
7
7
7
7
7
Minimum resistance of Limit resistor R (Figure 7A) in
series with 20K ohm Trimpot to ensure proper operation of
alarm relay, meter (AM Models only) and VDC ON indica-
tor (Ohms).
(1)
11.2K
9.76K
5.36K
5.36K
2.49K
Minimum external voltage (Figure 7B) to ensure proper
operation of alarm relay, meter (AM Models only) and VDC
ON indicator (Volts d-c).
(1)
2.5
2.33
1.46
1.46
0.73
Voltage source range (Volts d-c)
0 - 6
0 - 6
0 - 6
0 - 6.25
0 - 5.5
(1)
If operating below minimums listed, see PAR. 3.7.2.2 to implement ±PF alarm signals to monitor power supply status.
REMOTE VOLTAGE
CONTROL USING
EXTERNAL RESISTANCE
RA 19-4C
RA 19-4C
HSF SLOT 1
RV REF -COM
10
2
12
I/O 1
R
(SEE TABLE 5
FOR VALUES)
LOAD
J2
RV REF -COM
J2
I/O 1
10
12
2
VOLTAGE
SOURCE
(SEE NOTE)
LOAD
REMOTE VOLTAGE
CONTROL USING
EXTERNAL VOLTAGE
NOTE: SEE TABLE 5 FOR
MINIMUM VALUE.
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