MAT FULL RACK 022300
1-1
SECTION 1 - INTRODUCTION
1.1
SCOPE OF MANUAL
This manual contains instructions for the installation, operation, and maintenance of the Full
Rack size MAT series of voltage and current stabilized DC Power Modules manufactured by
Kepco, Inc. Flushing, New York, U.S.A.
1.2
GENERAL DESCRIPTION
The Kepco MAT Power Module with overvoltage, overcurrent, overtemperature, polarity rever-
sal, and power loss protection is a digitally controlled precision stabilized Power Module that
delivers either stabilized voltage or current. A single front panel meter with a selector switch
constantly monitors the output voltage or the output current. The prevailing operating mode is
indicated by LED mode indicators on the front panel. Operating mode crossover is dependent
on commands from a Host Computer and the value of the load. The Power Module has a linear
and fully dissipative NPN pass transistor driven by high gain integrated circuit amplifiers. The
output of the Power Module is fully programmable
The Power Module features full range output control by means of a compatible Kepco Power
Module Controller. Control of the MAT Power Module is via the IEEE 1118 2-wire serial bus
operating at 375KHz; as many as 27 separate modules of either the MAT, MST, MBT or BOP
Series design can be addressed via the bus (see Figure 1-1). Decoders for RS232, IEEE-488
and VXI are available in modular form and stand-alone types. As shown in Figure 1-1, the fol-
lowing controllers are available to control of MAT Power Modules directly from a computer.
a. Controller Model TMA PC-27 plugs into a half-card slot of a DOS-based PC and allows key-
board control of the MAT via the IEEE 1118 bus.
b. Controller Model TMA 4882-27 is free-standing and allows host computers designed for
RS232 or IEEE 488 bus communication to control the MAT via the IEEE 1118 bus.
c. Controller Model TMA-VXI-27 plugs into a slot in a VXI chassis and allows VXI-based com-
puters to control the MAT via the IEEE 1118 bus.
d. Controller Model MST 488-27 plugs into a slot in a Model RA 55 Rack Adapter and allows
host computers designed for RS232 or IEEE 488 bus communication to control the MAT via
the IEEE 1118 bus.
e. The MAT Power Module can also be directly controlled via the keypad of the MBT Series
(“G” Option) Power Supply via the IEEE 1118 bus.
An important feature of the MAT Series Power Module is the overvoltage and overcurrent pro-
tection circuits. This protection is provided by two autotracking amplifiers that have an overvolt-
age and overcurrent tracking range of 10% ± 3% of the nominal values above the programmed
Power Module output voltage or current (e.g., for 55V MAT which has been programmed to 2V,
the overvoltage will trip at 7.5 V (5.5V, 10% of n 2V, programmed).
The MAT series Power Modules are built in several mechanical sizes according to their approx-
imate output power rating 1/3 Rack, 2/3 Rack and Full Rack (see Mechanical Outline Drawing of
the Power Module Chassis, Figure 1-2).
Power transistors and drivers on all Power Module designs are mounted on highly efficient pat-
ented heat sink assemblies that are cooled by fans.
MAT 1/3 and 2/3 Rack size modules are designed to operate in either one of two housings
called RA 50 and RA 51. RA 50 is 5-1/4" x 19" x 25" and accepts up to three 1/3 Rack Power
Modules. RA 51 is similarly sized, but configured for one 1/3 Rack Module and one 2/3 Rack
Module. Full Rack MAT Power Modules mount directly into a standard 19 inch Equipment Rack.
