Siemens Pacemaker UM344-2 Bedienungsanleitung PDF herunterladen (Seite 125)

UM344-2 CALIBRATION AND MAINTENANCE

September 1995

TABLE 6.5 Symptom - Zero or Low Output, Continued

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

compartment.

Check power supply output voltage for specified level: 17 Vdc minimum, 42

Vdc maximum.

Check power supply for blown fuse or tripped circuit breaker.

Check polarity of loop wiring.

Check that loop resistance is between 250Ω and 1100Ω.

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 of loop cable and for electrical interference between

the loop cable and any adjacent cables in a cable tray or conduit.

Transmitter stuck in Loop Override

Mode.

Re-enter Loop Override from MXC Main Menu and properly exit Loop

Override Mode.

TABLE 6.6 Symptom - High Output

POSSIBLE CAUSE CORRECTIVE ACTION

Transmitter Electronics Failure Establish communications between the MXC and transmitter, then check the

STATUS of the transmitter. If a FAILSAFE message is posted, refer to Section

6.3.2.1, paragraph A, for troubleshooting procedures.

If transmitter STATUS checks OK, EXIT the Status screen to the On-Line

Menu and select LOOP OVRD (loop override). Verify the loop by setting the

output current to 4, 12 and 20 mA (read at Digital Meter or ammeter connected

to TEST +/- terminals.

If selected loop currents are significantly out of tolerance as measured by the

Ammeter, or loop current cannot be set, replace the Electronics Module. See

Section 6.5.2. If transmitter passes loop override test, continue

troubleshooting.

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Siemens Pacemaker UM344-2 Bedienungsanleitung Seite 125