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G R A H A M M O T O R S A N D C O N T R O L S V A R I S P E E D
®
A 2 0 0 0R E L I A B I L I T Y + C O M P A T I B I L I T Y S I N C E 1 9 3 5
INSTALLATION AND WIRING (CONTINUED)
WIRING (STANDARD AND ENCLOSED UNITS)
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TYPICAL WIRING DIAGRAM
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3. The National Electrical code requires a separate fused disconnect
be installed in the incoming AC poser line. See Ratings Chart and
Fuse Chart for proper sizing.
4. All components on the printed circuit board are at line potential.
Extreme caution should be exercised when working on unit.
Power should always be disconnected from the unit, before any
work is attempted, except where required for set-up.
5. DO NOT apply AC line voltage to any terminal except L1 and L2.
Failure to comply will cause permanent damage to the control.
6. Automatic restart of the control may occur if line power has been
temporarily lost. Caution should be exercised under such
circumstances.
Motor overload protection must be provided by the equipment
manufacturer or person installing controls per the National Electrical
Code.
1. Refer to Rating Chart for incoming line current and voltage. It is the
responsibility of the user or person installing the controller to provide
branch circuit protection according to the NEC and local codes. On
controllers using 120VAC input, be sure that the incoming hot lead is
connected to L1 and common is connected to L2.
2. A full wave field is provided for use with shunt wound motors when
required. Field voltage on 120VAC line is 100VDC. If the motor
requires a 50VDC (half wave) field voltage, connect field windings from
F1 to L2. Field voltage on 240VAC line is 200VDC. If the motor
requires a 100VDC field, follow the procedure outlined above.
3. Be sure that rated motor current and voltage do not exceed the ratings
label on the control. If using a motor with a lower rating than the
control, see Recommended Fuse chart for fuse size.
4. A chassis ground terminal has been provided to facilitate grounding of
the controller.
Be certain that a ground wire form the incoming
AC power line is properly connected to the
provide terminal. Failure to do this could result
in serious injury, equipment failure, or both. Conduit to enclosed units
cannot be used for grounding purposes since the enclosure is not metal.
5. The switch provided on enclosed models is RUN/STOP/JOG. Jog
speed is determined by speed pot setting.
RUN/STOP/JOG switch is for signal switching
only. Be certain, before working on either the
controller or machine, that AC power is
disconnected from L1 and L2 terminals. Failure to do so could result in
serious injury or death.
1
Switch
S1 (13)
TB1
L1
F1
A2,F2TB3
Run/Stop Switch (5,6)
Speed Potentiometer (7,8)
Tachometer (9,10)
(3)
Ground Terminal (4)
Motor Field (2)
A1
AC Input (1)
Enclosure with Operator (when used)
TB2 (11,12)
2
3
4
5
6
T
+–
+
–
Switch
Pot Hi
Wiper
Pot Lo
L2
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