GDS GASMAX II, Руководство по эксплуатации и обслуживанию

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GASMAX II Operation & Maintenance Manual, Revision 7.0
Page 45
RECEIVING DEVICE AND GASMAX DISPLAYED VALUES DON’T MATCH
•
Check that zero and full scale range values match between GASMAX and receiving device
(controller). Use DIAGNOSTICS menu to force GASMAX II output to 12mA (1/2 scale) and verify
appropriate half-scale reading on controller.
•
Check for high impedance shorts to ground on 4-20mA wiring.
•
If 4-20mA output is off-scale low or high and cannot be adjusted using DIAGNOSTICS mode,
IO/Power Supply board may be defective and should be replaced.
CONTROLLER MODBUS DATA INCORRECT
•
Verify that MODBUS master is requesting data from correct registers (31001 for channel 1 (toxic),
31002 for channel 2 (combustible).
•
erify that controller MI and M count settings are correct. MI counts should be “ ”
which corresponds to m and M counts should be “ ” which corresponds to m .
•
Verify that the GASMAX MODBUS address matches the address programmed into the controller’s
channel configuration.
CONTROLLER SHOWING MODBUS COMM ERROR
•
Check for incorrect M B polarity swap “ ” and “B” if unsure; no damage will occur .
•
Verify that MODBUS master is requesting data from correct MODBUS address.
•
Verify that MODBUS master is requesting correct registers: 31001 for channel 1 (toxic), 31002 for
channel 2 (combustible).
•
Verify that there are no other MODBUS slave devices with identical MODBUS address.
GASMAX DISPLAY BLANK
•
Verify DC power at IO/Power Supply board, TB2, terminals 1 (+24) and 4 (Gnd).
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Verify ribbon cable connected between IO/Power Supply board and Display Assembly.
•
Verify that there are no wires connected to the 4-20mA LOOP INPUT on the back of the Display
Assembly.
GASMAX ERROR CODES
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01 – Incorrect sensor type – new sensor does not match most recent type of sensor. This is
normal if changing sensor types. If unexpected, verify that new sensor type matches previous
sensor type.
•
02 – Zero or span mismatch. Smart sensor zero or span values differ from those stored in the
GASMAX.
•
03 – Sensor Calibration Error – Contact factory.
•
04 – Zero calibration failure – Zero readings must be within 10% of zero. For example, if the
range is 0-100 ppm, the zero reading cannot be above 10 ppm. For bridge-type sensors, it may be
possible to readjust the balance to restore a zero reading. Toxic sensors with high zero readings
must be replaced.
•
05 – Span calibration failure – Span readings must be within a range of from ½ to 2x the target
value. For example, if the target is 50 ppm, the sensor must output at least 25 ppm and no higher
than 100 ppm at the current preamp gain setting for calibration to proceed.
•
06 – History data file full. Clear event log to remove.
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07 – Sensor Channel Data CRC Fail – Error in sensor data transfer. Contact factory.