HSF (M) 300W 042315
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1.
INTRODUCTION
1.1
SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco HSF 300W Series,
Models M and MZ, of Metered Switching Power Supplies. For service information, write directly to:
Kepco Inc., 131-38 Sanford Avenue, Flushing, New York, 11355, U.S.A. Please state Model Des-
ignation and Serial Number of your HSF Power Supply. This information can be found on the
nameplate of the unit.
1.2
DESCRIPTION
The Kepco HSF 300 Watt Series M and MZ models are hot swappable, high frequency switching,
plug-in power supplies that are completely interchangeable with the non-metered HSF Series. Six
models may be selected for outputs of 5V, 12V, 15V, 24V, 28V or 48V. They employ forward con-
version and power factor correction and are designed to operate in a fault tolerant power system
with a nominal a-c input of 100V a-c to 240V a-c (input voltage range 85 to 265 Va-c), 50-60 Hz
(input frequency range 47-440Hz). A built-in current balancing circuit and OR-ing diodes allow
configuration for hot-swap and parallel-redundant N+1 operation.
NOTE: HSF 5-60M functions the same as MZ models. Throughout this manual, where there
are differences between M and MZ models, refer to the MZ model information for HSF
5-60M.
The HSF M Models (except for HSF 5-60M) use the HSF output to power the VDC ON indicator,
internal alarm relay, and the meter. A minimum HSF output voltage is needed to maintain function-
ality for these components.
The HSF MZ Models, as well as the HSF 5-60M, use an auxiliary internal power supply to power
the internal relay and the meter, allowing the output voltage to be adjusted down to zero without
affecting meter or alarm performance. The default configuration of MZ models uses an internal
reference voltage to power the VDC ON indicator. An option is provided which allows the VDC ON
indicator to be powered by the HSF output, requiring a minimum voltage to maintain functionality
of the indicator.
These power supplies are designed to be used with Kepco's Series RA 19-4C rack adapters. The
RA 19-4C rack adapter accepts up to four 300W modules. All input/output connections are
through a 24-pin connector that plugs in to the rack adapter. All external connections described in
the following paragraphs are made through the rack adapter’s I/O connector (see Figure 1).
FIGURE 1. HSF REAR PANEL CONNECTOR AND RA 19-4C RACK ADAPTER I/O CONNECTOR
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