HSMSERIES OPR 052912
1-1
SECTION I - INTRODUCTION
1.1
SCOPE OF MANUAL
This manual contains instructions for the installation and operation of the HSM series of voltage
and current stabilized d-c power supplies manufactured by Kepco, Inc., Flushing, New York,
U.S.A.
1.2
GENERAL DESCRIPTION
The HSM power supply is basically a voltage and current stabilized d-c source with a relatively
sharp crossover between voltage and current mode operation. This permits HSMs to be used
both as conventional regulated voltage sources and in applications such as battery chargers,
where automatic crossover between constant voltage and constant current operation is
required.
HSM power supplies are supplied in a single mechanical size and are nominally rated at either
1000 or 1500 watts of output power. HSM 1000 watt power supplies are designed to operate
over the universal a-c power mains voltage range of 90-277V (47-63Hz), with operation from
125-420V d-c also available. HSM 1500 watt products provide full power over the a-c mains
range of 180-277V a-c, with output power derating linearly to 1000 watts as a-c mains voltage
drops from 180 to 90V a-c. Active power factor correction circuitry limits source current harmon-
ics to negligible levels, significantly improving source power utilization. Cooling is provided via
an internal d-c fan.
The HSM permits adjustment of both output voltage (VO) and current limit (IMAX), either by
internal (pot) or external (resistance or voltage) methods; programming method is selected via
DIP switches accessed through the top of the unit. Independent circuitry provides protection
against overvoltage, overcurrent and overtemperature failures; fault detection circuitry monitors
performance of the output and critical internal functions, providing both visual and electrical indi-
cators. A switch-selectable "current walk-in" circuit and optional float/equalize functions
enhance the performance of HSM power supplies for such applications as battery chargers
The HSM power supply is designed for fixed installation applications where the load connec-
tions are hard-wired to the power supply. Forced current sharing and unique internal fault detec-
tion circuitry permits straight paralleling in redundant power applications with or without output
blocking diodes. Kepco RA 58 (or similar) rack adapters are available for EIA standard rack
mounting. For applications requiring plug-in or hot-swap power supply modules refer to Kepco
HSP Series power supplies.
1.3
SPECIFICATIONS
Table 1-1 below indicates specifications for parameters that vary for different HSM models;
Table 1-2 lists general specifications that apply to all HSM models.
TABLE 1-1. MODEL PARAMETERS
MODEL
OUTPUT VOLTAGE
(Volts)
OVP
SETTING
(Volts)
OUTPUT CURRENT
(Amps)
RIPPLE
(mV p-p)
NOISE
(mV p-p)
EFFICIENCY
(Percent)
(See Note 1.)
Nominal
(Factory
Set)
Adjust-
ment Range
Factory
Setpoint
50 ° C
60 ° C
71 ° C
Source
max
Switching
max
(Spike)
20MHz
100% Load
115V a-c
HSM 3.3-230
3.3
0.7-3.6
4.29
230
173
105
20
30
100
71
HSM 5-200
5
1.0-5.5
6.5
200
150
95
20
30
100
72
HSM 12-84
12
2.4-13.2
15.6
84
63
40
20
40
120
73
HSM 15-66
15
3.0-16.5
19.5
66
49.5
31.4
20
40
150
76
HSM 24-42
24
4.8-26.4
31.2
42
31.5
20
20
60
240
77
HSM 28-36
28
5.6-30.8
36.4
36
27
17
20
60
280
78
HSM 48-21
48
9.6-59.2
62.4
21
16
10
20
60
480
80
HSM 24-60
24
4.8-26.4
31.2
60
45
28.6
20
60
120
77
HSM 28-53
28
5.6-30.8
36.4
53
39.8
25.2
20
60
140
78
HSM 48-30
48
9.6-59.2
62.4
30
22.5
14.3
20
60
240
80
1. “R” Model efficiency is typically 2-3% lower.
10
00 W
a
tts
1500
W
a
tts
Summary of Contents for HSM 12-84
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