17
INSTALLATION AND OPERATING INSTRUCTIONS PRECISION
®
FILTER CLEANING SYSTEM CONTROLS
DESCRIPTION OF MENU ITEMS (P2 SPECIFIC)
Display.Units.
Allows the display units for pressure to be set to one of five commonly used measures. See table above. The selected units will
then be used for all differential pressure-related settings, and network reporting via P-MOD.
Demand.Cleaning.
Allows the parameters associated with demand cleaning control to be specified.
Limits.
High dP – The differential pressure at which pulse cleaning is to start.
Low dP – The differential pressure at which pulse cleaning is to stop. Alternatively:
Bandwidth.
High dP – The differential pressure at which cleaning is to start. (up to 10
″
WG or 2.49 kPA) Bandwidth % – The % range in which
the differential pressure is to be maintained (5 to 50%).
Alarm.Delay.
Used in conjunction with High dP Alarm, this allows the specification of a delay before an alarm is triggered. This can be used to
eliminate false alarms caused by spikes in the pressure readings. 255 seconds maximum delay.
High.dP.Alarm.
Assigns the differential pressure at which a high dP alarm is to be triggered. Maximum value is 10
″
WG or 2.49
kPa.
Precoating.
Allows filter seeding/precoating before the controller moves into its regular cleaning program mode. This is specified by a
differential pressure value at which the regular cleaning program is to activate. Maximum value is 10
″
WG or 2.49 kPA.
Pattern.Cleaning.
This allows the selection of a pulse-cleaning pattern to minimise dust re-entrainment. Selecting a cleaning pattern allows
solenoids to be wired in a sequential manner to the controller outputs, while pulsing in a non-sequential manner. Three options
are available: OFF, SKIP 1, SKIP 2.
With baseboard outputs only, valves fire in the following sequence:
OFF
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
SKIP
1 1, 3, 5, 7, 9, 2, 4, 6, 8, 10
SKIP 2 1, 4, 7, 10, 2, 5, 8, 3, 6, 9
Where expansion cards are connected (example below shows 2 cards connected):
OFF
1 … 10, 1C1 … 10C1, 1C2 … 10C2
SKIP 1 1M, 1C1, 1C2, 3M, 3C1, 3C2, 5M, 5C1, 5C2, 7M, 7C1, 7C2, 9M, 9C1, 9C2, 2M, 2C1, 2C2, 4M, 4C1, 4C2, …
SKIP 2 1M, 1C1, 1C2, 4M, 4C1, 4C2, 7M, 7C1, 7C2, 10M, 10C1, 10C2, 2M, 2C1, 2C2, 5M, 5C1, 5C2, 8M, 8C1, 8C2, …
M refers to baseboard output; C1 refers to expansion card 1; C2 refers to expansion card 2.
Remote.Stop.
Used in conjunction with Blowdown Cycles. This allows the blowdown cycles trigger to be selected from either:
Hardwired – blowdown cycles are started when the fan contacts are closed (Figure 2, item 12).
Automatic – blowdown cycles are started when differential pressure drops to a set value (0.1 to 2.0 kPa or 0.4 to 8.0
″
Wg).
No electrical connections to the dust collector fan are required. If the dP rises above the set value, normal operation resumes
regardless of the number of blowdown cycles completed.
Maximum.Interval.
Only functions when the P2 is in Demand cleaning mode. This specifies a maximum pause duration between pulsing cycles
when in Demand mode. This may be set to OFF, or from 1 minute to 999 minutes. When the cycle is triggered on the basis of
Maximum Interval, one complete cleaning cycle is executed. This mode can act as a backup cleaning mode when differential
pressures do not rise to the preset level for cleaning to commence, or when there is a blockage or leak in the differential
pressure-sensing lines.
