GDS Corp GASMAX CX, Руководство по эксплуатации и обслуживанию

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GASMAX CX + GDS-IR Operation & Maintenance Manual, Revision 1.0
Page 21
7 TROUBLESHOOTING
GASMAX CX SHOWS FAULT INDICATION ON LOCAL SENSOR

Certain.

Toxic sensors

Sensor reading

Sensor
GASMAX CX SHOWS FAULT INDICATION ON REMOTE SENSOR

Catalytic

Sensor reading

Sensor re
RECEIVING DEVICE AND GASMAX CX DISPLAYED VALUES DON’T MATCH

Check that zero and full scale range values match between GASMAX CX and receiving device
(controller). Use DIAGNOSTICS menu to force GASMAX CX 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 the MODBUS master is requesting data from registers 31001 for CH 1, 31002 for CH 2.

Verify that controller MIN and MAX count settings are correct. MIN counts should be “800”
which corresponds to 4mA and MAX counts should be “4000” which corresponds to 20 mA.

Verify that the GASMAX MODBUS address matches the address programmed into the controller’s
channel configuration.
CONTROLLER SHOWING MODBUS COMM ERROR

Check for incorrect MODBUS polarity (swap “A” 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 CH 1, 31002 for CH 2.

Verify that there are no other MODBUS slave devices with identical MODBUS address.
GASMAX CX DISPLAY BLANK

Verify DC power at IO/Power Supply board, TB1, terminals 1 (+24) and 4 (Gnd).

Verify ribbon cable connected between IO/Power Supply board and Display Assembly.
SOFTWARE RESET (“COLD BOOT”)
If the GASMAX CX display shows ‘nonsense’ characters or one or more of the settings appear to be
corrupted, performing a “Cold Boot” will restore the default values in the non ‐ volatile memory and may
clear the problem. To perform a ‘Cold Boot”, hold the magnetic wand over the EDIT key while applying
power.