PROBLEM 11
Load drum will not reach load drum maximum speed.
POSSIBLE CAUSES
Partial control from handle to controller; Partial control voltage from controller to pump
EDC or motor PCP; Damaged pump or motor.
When moving problem handle fully in both directions, does drum
Diagnostic screen show 100% handle command in raise or lower
direction?
Yes
No
When moving load drum handle fully in both directions, does drum Diagnostic screen show
100% pump or motor control in each direction?
is 28 volts present (full speed) and coil resistance of 17 to 19
ohms at pump EDC or to 26 ohms at Motor PCP. (See
Section 3 - Checking Electrical Inputs/Outputs.)
Yes
Voltage and Coil Ok
Remove plug at motor port M5 and check orifice for obstruction.
(See Section 2 - Motor Components.)
Repair or replace coil or wiring.
Obstruction
No Obstruction
Clean or replace
orifice.
Check pump and motor for leakage. (See Section 2
- Motor Leakage Test.)
Repair or replace pump or motor.
Voltage and/or Coil not Ok
No
Replace control handle or repair wiring.
CHECKS
Check selected load drum speed screen for 100% speed selected.
Yes
No
Make proper adjustment.
Consult Manitowoc dealer or
Crane Care Lattice Team.
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