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2.1
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2.2
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SECTrON rr
SYSTEMS EQUIPMENT DESCRIPTION
EQUIPMENT PURPOSE
The VT-700 Duplex AC Variable Torque Drive is a pre-engineered system
designed for variable torque load application, such as constant pressure
puming, where the torque varies as the square of the speed and the horse-
power as the cube of the speed.
Adjustment of motor speed by primary voltage control by using silicon
controlled rectifiers, allows the driven pump to control system para-
meters, such as pressure, liquid level or flow according to the sensing
device used.
EQUIPMENT FURNISHED - GENERAL
The general purpose VT-700 Duplex consists of one power and control
unit to operate the variable speed motor and a logic unit and a starter
for operation of the constant speed motor.
2.2.1 Power and Control Unit
Input voltage:
one of three:
200, 230 or 460VAC, 3-phase,
60 hertz.
The power unit contains the SCR assembly, the regulator
and the associated power and control components in a floor mounted
enclosure.
2.2.2 AC Drive Motors
Five to fifty horsepower, four rated speed available, specially
designed type KXA high-slip, squirrel cage induction motor with
thermal protection.
The constant speed motor is a super standard
type
K
motor.
2.2.3 Sensor
Normally Honeywell type
L918,
other types, depending upon
application, are available.
2.2.4
Special Purpose Equipment
See Elementary Diagrams.
2.2.5
Receiving, Handling and Storage
2.2.5.1
Receiving
The equipment should be placed under adequate cover
immediately upon receipt, as packing cases are not
suitable for out-of-doors or unprotected storage.
2-1
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