7
P-3026 • Doc. No. 60881 • Boston Gear
®
Ratiotrol
®
DC Motor Speed Control
Installation
AC Power Connections
Connect the AC input power wires to controller
Terminals L1 and L2 on Terminal Board TB1.
(
See Figure 5
)
If one of the power wires is a neutral wire
(grounded potential), connect the hot wire (H) to
Terminal L1 and the neutral wire (N) to Terminal
L2. Connect the controller Ground Screw
(GND) to an earth ground according to
applicable electrical codes. Ground Screw
(GND) is located near the bottom of the
controller enclosure. (
See Figure 5
)
If the neutral wire (Terminal
L2) is not grounded, the
controller remains electrically "hot" when the
AC power ON/OFF switch is turned off.
Motor Connections
Check the connection diagram supplied on or
with the motor. If the motor has dual voltage
shunt fields, connect the field terminal straps (or
leads) for low field voltage.
Connect the motor field and armature terminals
(or leads) to controller Terminals F+, F-, A+, and
A-, respectively, on Terminal Board TB1.
Do not ground the motor
wiring. Grounded wiring can
cause controller damage.
Connect the motor thermal guard, if applicable,
to Terminals 2 and 3 on Terminal Board TB2.
Be sure to remove the jumper wire from
Terminals 2 and 3 if a thermal overload is used.
(
See Figure 5
)
Initial Startup
Before energizing the controller for the first
time, be familiar with any installed options.
See the option selection table on the controller
data label.
The controller has been factory tested and
adjusted with a motor under simulated
operating conditions. Therefore, startup
adjustments should not be needed. However,
the following startup procedure should be
performed for proper operation, system
compatibility, and safety.
1. Be sure all interconnection wiring is correct,
and all wiring terminations are tightened
securely. Wiring errors and accidental
grounds can cause controller and/or
motor damage.
2. For 50 Hertz operation, be sure the 60 Hz
jumper wire is removed (cut out) from the
control board. (
See Figure 5
)
3. Close and latch the enclosure cover.
4. Turn the MOTOR SPEED potentiometer fully
counterclockwise to zero.
5. If so equipped, place the RUN/JOG switch in
RUN position and the FWD/REV switch in
FWD position.
6. Couple the motor to the machine (load).
7. Turn on the AC input power and the AC
POWER ON/OFF switch.
8. Depress the RUN button, and slowly turn the
MOTOR SPEED potentiometer clockwise
until the motor rotates. If motor rotation is
opposite to that desired, stop the motor with
the STOP button, turn off the AC POWER
ON/OFF switch and the AC input power, and
interchange the motor armature leads.
Never use line switching to
start and stop the motor.
Resulting transients may cause controller
damage.
9. Turn the MOTOR SPEED potentiometer fully
clockwise to 100 and observe motor rotation.
The motor should run at its rated (base)
speed.
10. Turn the MOTOR SPEED potentiometer
fully counterclockwise to zero and depress
the STOP button.
Section II
CAUTION
CAUTION
WARNING