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III — OPERATION
Turn the unit on using the front panel POWER switch (see
Figure 1). CAUTION: DO NOT repeatedly toggle the
POWER on/off switch as this may cause unit to fault.
When output voltage is available, the VDC ON LED is on
(green). For 100W and 150W 5V through 48V models the
VDC ON LED lights red to indicate a fan malfunction. The
100W 3.3V model and all 50W models use convection
cooling and do not include a fan.
While monitoring output voltage at the front panel test
points, the Output Voltage Adjust trimmer allows adjust-
ment of the output voltage.
The 3.3V models do not use forced current sharing so the
MASTER ON LED is always off. The MASTER ON LED
for 5V through 48V models goes on under any of the three
following conditions:
• Independent operation.
• Operation in a parallel master/slave configuration
to indicate which unit is the master
• Operation in a parallel master/slave configuration
PS1
3042496
KEPCO, INC.
131-38 SANFORD AVENUE
2
PS2
FIGURE 2. HSF -1UR MODELS INSTALLED IN RA 19-1U RACK ADAPTER
FLUSHING, NY. 11355 U.S.A.
http://www.kepcopower.com
to indicate that a slave unit is no longer within the
proper specifications for paralleled units. Slave 1
should be optimally adjusted to 40mV less than
master, slave 2 adjusted to 40mV less than slave
1, etc. The maximum allowable difference
between paralleled units is 250mv. The minimum
allowable difference between paralleled units is
25mV. If a slave exceeds these limits, the MAS-
TER ON light goes on.
The following features of the HSF -1UR power supplies
are covered in the applicable Operator's manual refer-
enced on page 1.
• Parallel Operation
• Forced Current Sharing
• Current Monitoring (Option C and Y only)
• Remote On/Off (option X and Y only)
• Alarms
• Keying
PS3
TEL (718) 461-7000
email: hq@kepcopower.com
228-1675 REV 1
PS4
Via Acquanera, 29
22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
info@calpower.it
www.calpower.it
FAX (718) 767-1102
061510
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