Rapid-Air PALLET MASTER (PMD) HIGH SPEED: 35, 50 & 100 SERIES - Manual (Page 17)

b) If line fuse does not blow but motor will not run:
1) Direction select speed adjust pot or unidirectional speed adjust pot may be defective.
2) Control switches may be defective
IV. Motor will not reach desired speed.
a) MAX SPEED trim pot may be set incorrectly.
b) FWD TORQUE OR REV TORQUE trim pot may be set too low.
c) If in tachogenerator mode, R! may be incorrect value.
V. Motor surges or pulsates.
a) IR COMP trim pot may be set too high.
Tachogenerator Feedback Mode
I. Motor always runs at maximum speed.
a) Tachogenerator output is wired opposite to the correct polarity. Reverse connec-
tions at Terminals 1 and 2
b) Tachogenerator output is interrupted or nonexistent. Check continuity of leads. Re-
place the tachogenerator if defective.
II. Motor oscillates at all speeds.
a) Check that the IR Comp trim pot is fully CCW.
b) Adjust the Current Stab trim pot CW until motor smoothes out.
c) Speed adjust pot may be open.
III. Motor oscillates at low speeds.
a) Very gradually turn the VOLTAGE STAB trim pot CW until the oscillation ceases.
(Unless this trim pot has been accidentally reset from its original calibration, you
should not need to readjust it!)
b) In the unlikely event that the oscillation is not completely eliminated by the voltage
stab trim pot, slight resetting of the current stab trim pot may be necessary. (Unless
this trim pot has been accidentally reset from its original calibration, you should not
need to readjust it!)
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