Neary 555 SRI, Service Manual

Page: 26 / 74

26
- ORIGINAL INSTRUCTIONS -
ELECTRICAL TROUBLESHOOTING
Possible Cause
Guard Doors are Open
Door Safety Switches
are not working prop -
erly
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 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 con -
tact 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 conti -
nuity to SSM if there is 24 VDC.
No--Verify wiring and continuity from PWR to
terminal blocks.
Measure approximately 24 volts DC from
Terminal Strip 1 Terminal 17 to Terminal Strip 2
Terminal 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 to Terminal Strip 1
Terminals 14 and 15.
Yes--Go to Step G . next.
No--Check Alignment of Rear door switch. If no
voltage to Term14 or 15 then replace rear switch.
Measure approximately 24 volts DC from
Terminal Strip 1 Terminal 17 to Terminal Strip 2
Terminals 2 and 4.
Yes--Replace SSM
No--Check alignment 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 24 Volts DC out to door
switches.
F.
With rear door closed verify 24Volts
DC back from rear door switch.
G. With front doors closed verify
24Volts DC back from front door
switch.
Checkout Procedure
PROBLEM-- Machine Shuts off when you turn on Grind motor switch or Spin Motor Switch.