Basler Electric MVC301 User Manual
INSTRUCTION MANUAL
FOR
ELECTRONIC MANUAL VOLTAGE CONTROL
Model: MVC 301
Part Number: 9 1210 00 107
Publication Number: 9 1210 00 994
Revision B: 12/99
WARNING
To prevent personal injury or equipment damage, only qualified technicians/operators should install, operate, or service
this device.
CAUTION
Meggers and high potential test equipment should be used
with extreme care. Incorrect use of such equipment could
damage components contained in the device.
CONFIDENTIAL INFORMATION
of Basler Electric Company, Highland, IL. It is loaned for
confidential use. Subject to return on request and with the
mutual understanding that it will not be used in any manner
detrimental to the interests of Basler Electric Company.
It is not the intention of this manual to cover all details and
variations in equipment, nor does it provide data for every
possible contingency regarding installation or operation.
The availability and design of all features and options are
subject to change without notice. Should further information
be required, call Basler Electric Company, Highland, IL.
SECTION 1
GENERAL INFORMATION
1-1. PURPOSE
The Electronic Manual Voltage Control (MVC-301) is used as a back-up control device to provide
manual voltage control in case of voltage regulator failure. The un i t can be mounted on a control
panel in ground vehicles, stationary equipment or shipboard locations.
1-2. OVERALL DESCRIPTION
The MVC-301 is a solid-state device enclosed in a metallic dark grey chassis and designed to be
'through-the-panel' mounted with the control accessible to an operator from the front of the panel.
A terminal strip located on the rear of the device facilitates installation and operation. An
AUTO-OFF-MANUAL
1-3. SPECIFICATIONS
Table 1-1 provides the electrical and physical specifications of the MVC 301.
voltage control mode switch is provided on the front panel.
Table 1-1. Specifications.
Input Power:
Output Adjustment
Range:
120 Vac Input:
240 Vac Input:
Watts Dissipated:
Minimum Residual
Voltage for Buildup:
Ambient Operating
Temperature:
Ambient Storage
Temperature:
Shock
Vibration:
Weight:
120 Vac, Single-Phase.
240 Vac, Single-Phase.
1 to 32 Vdc or 1 to 63 Vdc.
1 to 63 Vdc or 1 to 125 Vdc.
30 W maximum.
6 Vac.
-40 F (-40 C) to +158 F (+70 C)
-85 F (-65 C) to +212 F (+100 C)
Withstands up to 15 G's in each of three mutually perpendicular
axes.
Withstands the following:
5 - 27 Hz @ 1.3 G's,
27 - 52 Hz @ 0.036" double amplitude,
52 - 500 Hz @ 5 G's.
3.0 lbs. (1.36 kg) net, 5 lbs. (2.26 kg) shipping.
1-1
SECTION 2
PRINCIPLES OF OPERATION
2-1. GENERAL
a. The Electronic Manual Voltage Control (MVC-301) is a phase-controlled, silicon-controlled,
rectifier (SCR) bridge. By adjusting the external
angle of the SCR change providing an adjustable voltage level to the exciter field.
b. During start-up, the build-up circuit holds the SCRs power bridge at maximum output. When the
voltage has built-up to approximately 30 Vac, the internal build-up circuit relinquishes control to the
external
MANUAL VOLTAGE ADJUST
.
MANUAL VOLTAGE ADJUST
control, the firing
c. The
the Manual Voltage Control or from Manual Voltage Control to voltage regulator. A free wheeling
diode remains connected to the field to allow safe switching without arcing.
d. The MVC-301 is designed to operate from 120 or 240 Volt nominal sources without any electrical
changes such as tap selection or terminal connections. Taps are provided to select 32, 63, or 125
volt maximum outputs.
AUTO-OFF-MAN
voltage control mode switch allows transfer from the voltage regulator to
2-1
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