GASMAX II + GDS-IR Operation & Maintenance Manual, Revision 1.1
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TROUBLESHOOTING
GDS-IR SHOWS FAULT INDICATION
•
GDS-IR output < 4mA due to internal error condition. See Maintenance for more information.
•
Incorrect channel activated. Verify channel connected to GDS-IR is enabled.
GDS-IR READING > 0 WHEN NO GAS IS PRESENT
•
GDS-IR requires hardware zero. Perform Hardware Zero.
•
GASMAX zero calibration not correct. Calibrate GASMAX.
RECEIVING DEVICE AND GASM
AX 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).
•
Verify that controller MI and M count settings are correct. MI counts should be “ ”
which corresponds to 4mA and MAX counts
should be “ ” which corresponds to m .
•
Verify that the G M MO B address matches the address programmed into the controller’s
channel configuration.
CONTROLLER SHOWING MODBUS COMM ERROR
•
Check for incorrect MO B polarity (swap “ ” and “B” if u
nsure; 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).
•
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
•
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.
Содержание GASMAX II + GDS-IR
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