LEESON NEMA 4X SCR Control: 174903.00 (Obsolete) - Manual (Page 4)

INTRODUCTION
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Q. CAN I RUN TWO OR MORE MOTORS FROM THE SAME DRIVE?
A. Not recommended. The IR Comp (regulation) and Current Limit would have problems
sensing the different load on each motor.
Q. CAN I CHANGE THE HORSEPOWER OF MY MOTOR AND STILL USE THE SAME
CONTROL?
A. Yes, provided you do not deviate outside the horsepower range for the input voltage you
are using. The trimpots would need to be readjusted; see TRIMPOT CHART on page 11
for approximate settings.
Q. CAN I START AND STOP THE SPEEDMASTER WITHOUT BREAKING AC LINES?
A. Yes. Use the inhibit wiring instructions on page 12.
Q. CAN I USE THE SPEEDMASTER TO FOLLOW A VOLTAGE OR AS A TACH
FOLLOWER?
A. Yes, the signal must be ungrounded. See TERMINAL STRIP on page 7.
Q. CAN I USE A MOTOR WITH A 90 VOLT ARMATURE WITH 240 VAC INPUT?
A. Not recommended. Motor or control damage could result from peak voltages.
COMMONLY ASKED QUESTIONS
• LEESON'S Speedmaster variable speed DC motor control is a versatile, general purpose
control rated to 2 HP.
• The Speedmaster model has a dual voltage input (may accommodate either 120 or 240 VAC).
It is available with an adjustable HP range of 1/8 thru 1 HP for 120 VAC, and 1/4 thru 2 HP
for 240 VAC input.
• The control is designed for DC Permanent Magnet motors.
• Incoming AC voltage is also converted to adjustable full wave rectified DC voltage (via a
packaged bridge) to operate the DC motor.
• The control incorporates transient voltage protection with adjustable current limit and an AC
fuse for protection. It features adjustable minimum and maximum speeds along with adjust-
able acceleration and IR Compensation. Tach feedback is accomplished thru a connection
to a pin (P2) on the printed circuit board.
• The Speedmaster Series has a linear acceleration/deceleration ramp.
• The control also has a barrier type terminal strip for all power and control wiring.
• The enclosed model uses a gasketed cover assembly that is rated NEMA 4/12.