Krendl 500 - Page 34

Rev. Date: 3/14/18 Page 31
MODEL #500
Problem
1) Voltmeter showing no voltage or low voltage.
Electrical Troubleshooting
IMPORTANT
Whenever power is interrupted to unit (i.e., unplugged, main disconnect switch off, kill switch
depressed), power must be restored by correcting power interruption condition and pressing green
start button.
Corrective Action
A. Turn Main Disconnect Switch to ON position.
B. Check input cord(s) for proper connection to power source.
C. Check power source for proper voltage.
D. Open Main Control Box lid and check voltage with multitester
at voltmeter terminals. Replace defective voltmeter.
E. On single input, 240volt/60hz. units, check for proper wiring
of four prong plug and connector body.
A. Check voltmeter. If no voltage, refer to #1 above.
B. Check power on both input cords. (double input machines)
C. Check indicator tab on the top of the dropout relay. If tab is
out, relay is not engaged. If tab is in, relay is engaged. On
double input machines, check the dropout relay on the top
(C3). (If tab is "in", refer to #3.)
A. Check transformer breaker (breaker#1) (Green, breaker is
tripped. Red breaker is OK.)
B. Check secondary output of transformer (24volt). Replace if
necessary
A. Check for proper start-up conditions as mentioned at
beginning of this section. (See #2)
B. Be sure remote control cord is properly plugged into Main
Control Box.
C. Check remote control cord and hand pendant switch for
damage or loose connections.
D. If neither Remote mode or Manual mode will function, check
transformer breaker (breaker#1) (Green, breaker is tripped.
Red breaker is OK.)
A. Check operation in remote mode and manual mode with 4-
Position Selector Switch and remote hand pendant.
B. Check blower control for ON position.
C. Check for defective, broken, or loose wiring connections
inside Main Control Panel.
D. Check blower motor. Disconnect power supply and visually
inspect system for defective, broken or loose wiring connec-
tions inside blower box.
E. Check blower breaker(s) in Main Control Panel. (Green,
breaker is tripped. Red breaker is OK.)
F. Check Blower Controls. Disconnect Blower Control wires
on Main Control Panel door and reconnect the two power
leads bypassing the Blower Control. (Blower will run full
speed only.)
G. Visually inspect and/or replace blower relay (C5) inside
Main Control Panel.
2) Dropout relay does not engage.
3) Dropout relay is engaged (tab is "in"), but machine will not
run.
4) Machine does not function with hand pendant while 4-
Position Selector Switch is in REMOTE mode.
5) Blower motor does not run, but agitator motor does run.