Bacharach Parasense GRM2 CO2 Series, Operation & Maintenance Manual

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7-4
Operation & Maintenance Manual
Doc. Ref. MNGRM2CO2 REV. 3
3) Initiate a manual sample and confirm solenoid 1 has 0V DC across it and solenoid 2 has 24V DC
across it when the pump has just started running. After a period of pump operation, solenoid 1
and solenoid 2 should both change state (such that solenoid 1 has 24V DC across it and solenoid
2 has 0V DC across it) and the pump should be heard to lower in tone. Approximately 5 - 10
seconds after the pump stops, solenoid 1 should change state (such that it has 0V DC across it).
If the voltages are incorrect then the network module will need to be replaced. If the voltages are
correct then the Styx module will need to be replaced.
Pump Flt
This message is shown if the pressure in the Styx module did not rise to the expected level during the
purge stage of a sample cycle.
If all SAMMs are affected it is probably the Styx or network module. If an individual SAMM is showing
a fault it could be a blockage in either the freeway or spur.
Fault finding steps:
1) Check all screw-in terminals and ribbon cable connections are secure.
2) Disconnect the freeway for the affected SAMM at the monitor and initiate a manual sample. If this
rectifies the problem check/replace the freeway or spur for kinks or blockages.
3) If disconnecting the freeway did not rectify the problem, it will be necessary to initiate a manual
sample with the door open before making the following additional checks:
4) Confirm solenoid 1 has 0V DC across it and solenoid 2 24V DC across it when the pump has just
started running. After a period of pump operation, solenoid 1 and solenoid 2 should both change
state (such that solenoid 1 has 24V DC across it and solenoid 2 has 0V DC across it) and the
pump should be heard to lower in tone. Approximately 5 - 10 seconds after the pump stops,
solenoid 1 should change state (such that it has 0V DC across it). If the voltages are incorrect
then the network module will need to be replaced. If the voltages are correct then the Styx
module will need to be replaced.
STYXCold / Warming
At startup, the monitor waits for 2 minutes before commencing sampling in order to allow the Styx and
any optional RS485 network sensors to stabilise. During this time, this fault state may be indicated.
Note: The monitor door must be kept closed and locked to maintain the correct operating
temperature.
Fault finding steps:
1) Check all screw-in terminals and ribbon cable connections are secure.
2) If the fault persists
contact your service representative
RScksum/RStime/RSwakeup/RSwrite
These messages are shown if an RS485 network communication failure was detected during a
sample cycle on an RS485 network SAMM. The wiring of the RS485 network should be verified to
ensure that all modules are correctly powered, RS485 A & B signals are orientated correctly and the
network is terminated (by way of the ATM2R termination jumper) only on the final ATM2R module in
the chain.