Rapid-Air PALLET MASTER (PMD) HIGH SPEED: 35, 50 & 100 SERIES - Manual (Page 14)

IMPORTANT:
A non-metallic screwdriver must be used when setting the trimpots to avoid any possibility of
the screwdriver’s blade contacting live circuitry and shorting the circuitry or allowing contact
with any dangerous or fatal voltages.
Eight trim pots, located on the PC board, are provided for tuning the control to obtain optimum
performance.
Two unlabeled trimpots have been added to the logic board. They are used only in the factory
calibration procedure. Any changes made to these settings may seriously degrade the perform-
ance of the control and void its warranty.
MAX SPEED ADJUSTMENT
This feature is provided to allow maximum motor speed to be adjusted between 70 to 100% of
motor nameplate rated speed when the direction select adjust pot is set at maximum for either
rotation.
IR COMP ADJUSTMENT
Regulation is obtained by circuitry which raises the armature voltage to minimize speed loss
with increased loading. This trim pot is factory preset fully CW.
FWD TORQUE AND REV TORQUE ADJUSTMENTS
These are provided for protection against excessive armature current, with current limited to ap-
proximately 120% of full load rating with factory set trim pots. Since current draw is usually
highest upon start-up and acceleration, the setting of these trim pots can extend the acceleration
time. IMPORTANT: Do not adjust either torque trim pot to a value higher than 130% of full
motor current.
FWD ACCEL AND REV ACCEL ADJUSTMENTS
These trim pots set the amount of time required for the motor to accelerate from some speed to
a greater speed in either direction. These are settable from 0.1 second through 15 seconds
(approximately) from zero to full speed, depending on motor inertia. The actual minimum ac-
celeration rate is dependent upon available torque. When operating in the reverse direction, the
forward acceleration trim pot controls the deceleration time. When in the forward direction, re-
verse acceleration acts as forward deceleration. Turning the trim pots CW increase the Accel/
Decel time.
CURRENT STAB ADJUSTMENT
The effect of the adjustment is most apparent in the DC tachogenerator feedback operating
mode. Current Stab is factory set at 50% of CW and should not required adjustment unless the
tachogenerator signal has considerable ripple. Then, you should turn this pot CW until motor
stabilizes.
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