21INSTALLATION AND OPERATING INSTRUCTIONS PRECISION
®
FILTER CLEANING SYSTEM CONTROLS
Operational
SYMPTOM CAUSE RESOLUTION
P2 does not go into cleaning mode on
startup. Display shows: ‘Precoating’.
Valves do not pulse.
P2 is waiting for differential pressure to rise
above the factory preset Precoating value
(1.5 kPa, 6″ WG) or the user set value.
Enter the menu and set Precoating to off, or
wait for differential pressure to rise.
P2 does not go into cleaning mode on
startup. Display shows: ‘Stopped (dP)’. Valves
do not fire.
P2 is waiting for differential pressure to
rise above the factory preset Remote Stop
trigger value (0.5 kPa or 2″
WG) to commence
operation.
Enter the menu and set remote stop dP to
the preferred value or to ‘Hardwired’, or wait
for the dP to rise.
P2 does not go into cleaning mode on
startup. Display shows: ‘Stopped (FAN)’.
Valves do not pulse.
Fan contacts are closed on the baseboard. Check wiring to fan contacts; if the fan or
another circuit breaker is not connected
to the Precision, the fan contact terminals
should be open.
If the fan is connected to the baseboard,
check that the contacts at the fan are
normally open type, and check the wiring.
Valves on multiple expansion boards
are firing simultaneously. The outputs
correspond to each other.
Two or more expansion cards are set with the
same address.
Check each output is assigned a unique
address.
Expansion cards are not pulsing sequentially
(Pattern cleaning mode is off).
Expansion card addresses have not been
assigned in sequential order.
Re-assign expansion card addresses in
numerical order.
P-MOD Modbus Communications
SYMPTOM CAUSE RESOLUTION
System is not recognised on the DCS or
plant SCADA system. P-Mod is recognised
by Precision on startup.
Modbus communications is turned OFF in the
menu. Diagnostics on startup will indicate
Network is OFF.
Network address of controller is incompatible
with address assigned at DCS level.
Enter the menu, and at the network menu
item ensure the network is given an address,
rather than set to off.
Check address setting on the Precision
matches the DCS.
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