Troubleshooting - Groen TDB-20 TA/2 Operator's Manual

Your Groen Mixer will operate smoothly and efficiently if properly maintained. However, the following is a list
of checks to make in the event of a problem. If the actions suggested do not solve the problem, call your
authorized Groen Service Representative. For the phone number of the nearest agency, check the Groen
web site at www.groen.com, ask your area Groen representative or call the Groen Parts and Service
Department. If an item on the list is followed by X, the work should only be performed by a qualified service
representative.
USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY GROEN OR THEIR
AUTHORIZED DISTRIBUTORS CAN CAUSE INJURY TO THE OPERATOR AND DAMAGE TO THE
EQUIPMENT AND WILL VOID ALL WARRANTIES.
SERVICE PERFORMED BY OTHER THAN FACTORY-AUTHORIZED PERSONNEL WILL VOID ALL
WARRANTIES.
SYMPTOM
Motor will not run. User
Auth Service
Rep Only
Auth Service
Motor runs at high
Rep Only
speed only without
control.
User
Motor runs at low speed
only.
Auth Service
Rep Only
Motor speed varies
Auth Service
rapidly.
Rep Only

Troubleshooting

WARNING
WHO
X indicates items which must be performed by an authorized technician.
a. Power supply to the unit.
b. Fuse in the control console.
c . For a mechanical overload.
d. For a defect in the power module. Check SCRs and diodes.
X
e. Regulator.
f. For loss of reference voltage. Check speed adjustment pot
and wiring. Check maximum speed pot. X
g. Motor brushes for wear or sticking. X
h. That the tilt switch is closed. X
i. For a ground or short in the motor. X
a. Speed adjustment pot or wiring. X
b. Power module. X
c. Regulator. X
a. For a mechanical overload.
b. Speed adjustment pot or wiring. X
c. Motor brushes for wear or improper seating. X
d. Regulator X
e. For open motor field circuit, by checking field current. X
a. For an oscillating load, by disconnecting the mixer drive from
the agitators and checking motor speed. X
b. Motor brushes for wear, improper seating, or sticking in
holders. X
c. I.R. drop compensation, and adjust if set too high. X
d. SCRs. X
e. I.R. drop compensation pot. X
f. Dirty or defective regulator. X
g. Control panel and motor for a ground. X
11
OM-TDB TA/2
WHAT TO CHECK