Troubleshooting - Sentry SPD 5.5.5 Installation And Operation Manual

Sample Sequencer

TROUBLESHOOTING

Troubleshooting Guide
Symptom
Display doesn't light
Incorrect ANALOG mA
Incorrect valve operates
Valves don't operate
SENTRY
Equipment Corp • P. O. Box 127 • Oconomowoc, WI 53066 • 262/567-7256 • FAX: 262/567-4523
Possible Problem(s)
Power
Board connection
Fuse on I/O board
Analyzer signal
Polarity
Wiring
Valve power
Fuse
Web: www.sentry-equip.com • e-mail: sales@sentry-equip.com
Remedy
1. Verify power supply outputs 6-9 VDC.
2. Verify polarity is connected correctly to I/O
board.
1. Verify I/O board is snugly connected into I/O
board.
2. Verify I/O board component-side is on right
side from rear view.
1. Remove F1 (3A) on the I/O board and test
for continuity. Replace if defective.
1. Verify the input signal from analyzer is 0-20
mA.
2. Verify the analog signal polarity is correctly
connected to the I/O board terminals (+) and
(-) on J4.
1. Verify the interconnected cable (8 conductor)
is correctly connected from the I/O board
terminals and the valve relay board.
1. Verify power was brought to the valve relay
board J1 terminals labeled (+) and (-).
Danger: Disconnect power before checking
this!
1. Check F1 fuse on the valve relay board.
Replace with 1A fuse if defective.
Troubleshooting
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