Krendl 500, Owner'S Manual, Page: 35 / 59

Rev. Date: 3/14/18 Page 32
MODEL #500
A. Check wiring connections on Selector Switch contacts.
(Located on back of Main Control Panel door.)
A. Clean or replace Filter on Blower Door. Check inside
Blower Box for debris/insulation. Blow out blower motor
and surrounding area with compressed air.
B. Check material hose for blockage. A restriction in the
material output hose will cause the blowers to run hotter
than normal.
C. Check blower motor for proper operation. (i.e. bearings,
armature, or worn brushes)
A. Blow out brush assembly area with compressed air to
remove accumulation of dirt and debris.
B. Check blower motor for proper operation. (i.e. bearings,
armature, etc.)
C. Replace brush assembly. (See page 18 and 19 of General
Maintenance. )
A. Manual Reset on agitator is tripped. Disconnect power
supply to machine. Wait until agitator motor cools,
(approximately 15 minutes), and press button on motor to
reset.
B. Check for defective, broken, or loose wiring connections
inside Main Control Panel.
C. Visually inspect and/or replace agitator relay (C4), inside
Main Control Panel.
A. Disconnect power. Check agitators and airlock for debris.
B. Low voltage. Try another electrical source. Use proper wire
size for power input cords.
C. Check bearings, sprocket and chain for binding, failure, or
drive system misalignment.
D. Remove outside vertical drive chain from upper agitators.
Run motor/reducer and airlock assembly under power.
Check amperage.
E. Make sure the voltage, cycle (hertz), phase (1 or 3), and
direction of rotation is correct.
F. Replace agitator motor and/or speed reducer.
A. Check sprockets for missing key. Replace with 1/4" key.
B. Chain broken or off sprocket. Repair or replace.
C. Check gearbox for sheared key between motor and reducer
or leaking oil.
A. Pre-alarm relay C1 (timer relay with knob adjustment),
should be turned counterclockwise/left. This will reduce
time duration of alarm.
B. Replace relay module.
6) Blower motor does not run in manual mode. (4-Position
Selector Switch.)
7) Blower motor running hot.
8) Excessive arcing of brushes on blower motor.
9) Agitator motor does not run, but blower motor does run.
10) Agitator motor running improperly or hot.
11) Agitator or airlock feeder not turning.
Electrical Troubleshooting (cont.)
12) Pre-alarm sounds too long or continues
without activating machine.