Service Manual
DS 350 GM
Rev A 05/01/01 // SB
190113_A
26
3.10 BAD DATA TRANSFER BETWEEN CONSOLE & CENTRAL UNIT OR
INTERFERENCE PROBLEM
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Correct?
No Fault in cable
Measure pressure transducer signals on the analog input module between test points:
Piston Side, MP0 (ground) and X1:1 .
Rod Side, MP0 (ground) and X1:2.
The measurements should be between 0.5-4.5v (0.5v(500mv) at 0psi to 4.5v at 4410psi).
Refer to Drawing 4 & 9 in Section 4.
If transducer(s) are not adjustable.
Replace pressure transducer(s) and adjust zero point.
Refer to Procedure 4 in Section 5.
YES
Correct?
END
YES
Measure signal from pressure transducers in central unit. The return signal is a current output and must
be measured in series. Set Voltmeter to measure amps.
Piston Side
, remove Wire #2 from X1:21 in the central unit and connect one ammeter lead to wire #2
and the other lead to X1:21. The measurement should be between 4-20ma (4ma when there is no
pressure in the hydraulic lines; 0 psi).
Rod Side
, remove Wire #2 from X1:24 in the central unit and connect one voltmeter lead to wire #2
and the other lead to X1:24. The measurement should be between 4-20ma
(4ma when there is no pressure in the hydraulic lines; 0 psi).
Refer to Drawing 1 in Section 4.
Check continuity of wire 2 and pin B in pressure transducer cable by first
unplugging the transducer cable from transducer and second moving wire 2 to
the ground terminal X1:22 or X1:25. Measure voltage at the cable connection
between A (+12/24v) and B (ground) for each connector.
Re-connect the wiring a shown on Drawing 1 in Section 4.
Refer to Drawing 1 in Section 4.
Analog Input board defective.
Replace analog input board.
Refer to Drawing 4 in Section 12 and Replacement
Procedure 3 steps 4,11, & 12 in Section 5.
NO
NO
Adjust zero point on pressure transducers.
Adjustment Procedure 4 in Section 5.
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