Siemens Pacemaker UM344-2 Uživatelský manuál stáhnout pdf (Strana 123)

UM344-2 CALIBRATION AND MAINTENANCE

September 1995

TABLE 6.2 Message - No Transmitter Found, Continued

Possible Cause: Loop Power

Supply Failure

Check power supply output voltage for installed network resistance:

17 Vdc minimum at 250Ω

42 Vdc maximum at 1100Ω

Check power supply for blown fuse or tripped circuit breaker

Possible Cause: Transmitter

Electronics Module Failure

Replace Electronics Module. Refer to Section 6.5.2.

TABLE 6.3 Message - Communication Error

This message results when, after having successfully established communications with a transmitter, an

error flag is detected in a received message and the message is not accepted. Error types are: Vertical

Parity Error, Overrun Error, Framing Error, Longitudinal Parity Error, and Buffer Overflow.

POSSIBLE CAUSE CORRECTIVE ACTION

Possible Cause: Noise on Loop

Wires

Press RETRY (F3) at least 3 times, waiting at least 1 minute between retries. If

not successful, continue troubleshooting

Loop Wiring Failure Check for 12 Vdc minimum across SIGNAL +/- terminals in transmitter terminal

compartment.

Check polarity of loop wiring.

Check that loop resistance is between 250Ω and 1100Ω to support HART

communications.

Check for loose or broken loop wiring at power supply terminals, Supply

Barriers (if used), junction boxes, and transmitter terminal compartment.

Check for disconnected or broken Current Sense Resistor.

Check for short between cable shield and SIGNAL + loop wire.

Check for accumulation of moisture in transmitter terminal compartment.

Check for the proper type and length of loop cable and for electrical

interference between the loop cable and any adjacent cables in a cable tray or

conduit.

Loop Power Supply Failure Check power supply output voltage: 17 Vdc minimum, 42 Vdc maximum.

Check power supply for blown fuse or tripped circuit breaker.

Transmitter Electronics Failure Replace Electronics Module. Refer to Section 6.5.2.

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Siemens Pacemaker UM344-2 Uživatelský manuál Strana 123