07
INSTALLATION AND OPERATING INSTRUCTIONS PRECISION
®
FILTER CLEANING SYSTEM CONTROLS
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The Precision baseboard has ten outputs. A further 190 outputs may be added in increments of 10 by serial connection
(19 maximum expansion cards per baseboard) by either PS-C and PS-L terminal expansion boards connected to AC/DC
or DC/DC baseboards, and PS-CA and PS-LA connected to AC/AC baseboards.
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PS-C, PS-L expansion cards, AC/DC and DC/DC baseboards have 24 V DC output at each terminal, each capable of powering
three 24 V DC, 20 W solenoids simultaneously to a maximum of 2.5 A at each DC output terminal. With a maximum of
19 expansion cards connected to the baseboard (200 outputs), the controller can pulse 600 solenoids.
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PS-CA and PS-LA expansion boards and AC/AC baseboards have 110 V AC or 240 V AC output (depending on mains input
power) at each terminal, each capable of powering ten 110 V AC, 22 W or 240 V AC, 25 W solenoids simultaneously to a
maximum of 2.4 A at each AC output terminal. With a maximum of 19 expansion cards connected to the AC/AC baseboard
(200 outputs) the controller can pulse 2000 solenoids.
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Terminal expansion board types may be mixed between compact and large expansion cards but not between AC and DC
output voltage.
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DC expansion cards are connected to the baseboard in series via terminals 11 and 14 in Figures 2, 3, and 4. AC expansion
cards are connected via terminals 30 and 31 in Figures 5, 6 and 7. Please refer also to the system wiring diagram in Figures 8,
9 and 10 for connecting details.
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Communication between baseboard and DC output expansion cards is via a multi-drop RTU two-wire RS485 connection.
Four-core shielded mains-flex cable is recommended for the connection of expansion cards. Suggested wire gauge is
11/0.2
×
4-core plus shield (drain) such as a Belden 8723NH data cable or equivalent. Two cores are used for communication
between baseboard and expansion cards; the remaining two cores are required for power supply to the solenoids, plus drain.
Note that solenoid power is provided by this connection; no additional external power is required.
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Communication between baseboard and AC output expansion cards is via an isolated multi-drop RTU two-wire RS485
connection (7/0.2) plus drain cable. Power is supplied via 2-core plus earth (1.5 mm
2
) cable. Note that solenoid power is
provided through this connection; no additional external power is required. Please follow any local standards for segregation
of power and communications cables.
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Ensure each expansion card is given a sequential address by using the rotary switch and DIP switch No. 2 (see item 17,
Figures 3, 4, 6 and 7). Do not assign an address of zero on expansion cards; zero is reserved for the baseboard.
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For solenoid connections, connect up to 2.5 mm
2
stranded cable from the output terminal to the relevant valve solenoid.
Link the common terminal of all solenoids and return to the common on the baseboard or on the expansion cards.
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When connecting expansion cards, set DIP switch 1 (Figures 2 and 5, item 20) to the ‘ON’ position. This enables the 120 ohm
terminating resistor. No separate resistor is required. Repeat this process on the last expansion card on the Modbus network.
Note:.
The precision automatically detects all expansion cards and solenoids connected to the system.
Fan.contact.connections.
These contacts (Figures 2 and 5, item 12) are used to trigger blowdown cycles; if the blowdown cleaning cycles are selected, this
feature is triggered through electrical contacts. Optionally, blowdown cycles may be triggered by the dP of the collector (this is a
feature of the P2 interface). Please refer to the system wiring diagrams in Figure 8.
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These are voltage-free contacts
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Connect the normally open voltage-free contacts on the dust collector fan motor to the ‘Fan’ and ‘GND’ contacts on the
baseboard (refer Figures 2 and 5, item 12). When the system fan is turned off, the motor contacts close and the ‘Fan’ and
‘GND’ contacts are bridged on the Precision baseboard. This triggers the blowdown cycles to commence for the programmed
number of cycles.
