Figure 53: Smart Pro Ttl/Relay Flow Chart - Ohmart Vega W-4510 Technical Reference Hardware Manual

Diagnostics and repair
TTL/Relay Flow Chart
Start
Does
U-21 No
measure +5VDC
from
4-8?
Yes
Are
No
outputs
in Table #1
correct?
Yes
Are
signals at
No
I/O TB numbers
(see Table #2)
correct?
Yes
External wiring or
field device
problem
End
112
Refer to power
supply flow chart
Replace CPU
board
Is
No
Replace I/O
signal at I/O cable
board
correct?

Figure 53: Smart Pro TTL/Relay flow chart

W-4510 Weigh Scale Technical Reference Manual
Table #1 – CPU Board
Relay LED Integrated Circuits
#1 D22 U21-3 to U21-4
#2 D23 U21-55 to U21-4
#3 D25 U13-3 to U13-4
#4 D26 U13-5 to U13-4
TTL (O.C.) LED Nonisolated
#1 D24 U10-3 to 4
#3 Also relay U13-3 to 4
#4 #3 & #4 U13-5 to 4
#5 D27 U23-3 to 4
#6 D28 U23-5 to 4
-D22 RLY #1
-D23 RLY #2
-D24 TTL #1
-D25 TTL #3 (RLY #3)
-D26 TTL #4 (RLY #4)
-D27 TTL #5
-D28 TTL #6
Bi-Level Input:
-D29 Note: Access level 3 required
-D30 Screen 550
-D31 Screen 554
-D32 Screen 565
-D33 Screen 567
-D34
Active low energizes relay
Table #2 – I/O Board
Relays: TB# COM
2 -1
2 -4
2 -7
2 -10
TTL (O.C.) TB# Non-isolated
3 1-11
3 5-11
3 6-11
3 7-11
3 8-11
Isolated Jumpers
U11-4, -5 J12
N/A
N/A
N/A
N/A
N.C. N.O.
-2 -3
-5 -6
-8 -9
-11 -12
Isolated
1-2
N/A
N/A
N/A
N/A