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ELECTRICAL TROUBLESHOOTING (Continued)
Possible Cause
Guard Doors are
Open
Door Safety
Switches are not
working properly
No 24 Volts DC to
Safety Monitor
(SSM)
No Power into 24
Volt DC Power
Supply (PWR)
No Power Out to
Door Switches
Rear Door Switch or
Rear Ramp Switch
is Bad
Front Door Switch is
Bad
Measure 120 Volts AC at MAG term L3 to
Term Block 4(Blue) after SSS is pushed.
Yes--Verify Wiring to LVR
No--Measure 120 Volts AC at MAG term T3
to Term Block 4(Blue) after SSS is pushed.
If 120 Volts AC Replace MAG. If no 120 Volts
AC verify wiring to T3.
PROBLEM--(MAG) turns on only with
System Start Switch held in.
Checkout Procedure
A. Check wiring to and from MAG
holding contact in. Verify the
magnetic starter holding contact is
working.
Possible Cause
(MAG) holding
contact has failed
Machine works
Yes--end troubleshooting
No--go to Step B. next
See Alignment section of this Manual.
Machine works
Yes--end troubleshooting
No--go to Step C. next
Measure 24 volts DC from SSM Terminal A1+
to Terminal A2-
Yes--Go to Step E. next.
No--Go to Step D. next.
Measure 120 volts AC from PWR Terminal L to
Terminal N
Yes--Verify 24 VDC out of PWR (V+ to V-).
Replace if no Voltage out; or Check Wiring &
Verify Continuity to SSM if there is 24 VDC.
No--Verify Wiring and Continuity from PWR
to terminal blocks (16TBW-12 and 24TBG-8)
Measure approximately 24 volts DC from
Terminal Strip 1 Terminal 17 (56TB1-17) to
Terminal Strip 2 Terminal 3 (29TB2-3)
Yes--Go to Step F. next.
No--Verify Continuity of Wires to Terminal
strip, Replace SSM if wires check OK.
Measure approximately 24 volts DC from
Terminal Strip 2 Terminal 3 (29TB2-3) to
Terminal Strip 1 Terminals 14 and 15.
Yes--Go to Step G. next.
No--Check Alingment of Rear door switch. If
no Voltage to Term14 or 15 then replace rear
switch. If still not working replace cord.
Measure approximately 24 volts DC from
Terminal Strip 1 Terminal 17 (56TB1-17) to
Terminal Strip 2 Terminals 2 and 4.
Yes--Replace SSM
No--Check Alingment of Front door switch. If
no Voltage to Term2 or 4 after alignment then
replace front switch.
A. Close the front doors and rear
door
B. Check Alignment of Door Safety
Switches on front doors and rear
door
C. Check SSM for 24 Volts DC.
(Turn switches off and press start
switch to pull in MAG before
testing voltages)
D. Check PWR for 120 Volts AC.
(Turn switches off and press start
switch to pull in MAG before
testing voltages)
E. Verify 24Volts DC out to Door
Switches.
F. With Rear Door closed or Rear
Ramp Closed Verify 24Volts DC
back form rear Door Switch.
G. With Front doors Closed Verify
24Volts DC back form Front Door
Switch.
Checkout Procedure
PROBLEM--Machine Shuts off when you
turn on Grind motor switch or Spin Motor
Switch.