Donaldson Torit DFO 3-6 Specifications download pdf (Page 22)

Donaldson Company, Inc.

Delta P Control Calibration

The only user calibration is the zero adjustment of

the display. Due to slight changes in electronic

components over time, or pressure differentials

within the plant environment, the display may read

something other than 0.0 while at rest. Use the

following procedure to recalibrate the operating

system.

1. Turn power to the Delta P Control ON for a

minimum of 30-minutes to stabilize the

operating temperature.

2. Turn power to the control OFF.

P. Press and hold the LOW SET, HIGH SET, and

ALARM SET keys while turning power to the

control back ON. Continue holding the keys as

the control goes through its power-up sequence.

The number 8 is displayed in each digit, and

then the display reads 0.0.

4. Release the three keys. The new calibration is

automatically stored in memory.

Caution!

• The compressed-air supply must be

oil and moisture free. Contamination

in the compressed air used to clean

filters will result in poor cleaning,

cleaning valve failure or poor

collector performance.

• Purge compressed-air lines to remove

debris before connecting to the unit’s

compressed-air manifold.

• Turn compressed-air supply OFF and

bleed lines before performing service

or maintenance work.

1. Remove the plastic pipe plug from the unit’s air

manifold and connect the compressed-air

supply line. Use thread-sealing tape or pipe

sealant on all compressed-air connections.

Compressed Air Installation

Optional Settings

2PMJVolt Power Supply

To operate at 230-Volt, remove two jumpers

labeled W1 and W3. Reinsert one of the jumpers in

position W2.

Change from English to Metric (SI) Units

On the J1 jumper block located above the PROG

DISABLE terminals, move the jumper from the

center and left pins 2 and 3, to the center and right

pins 1 and 2.

Disable Setpoint Adjustment

To restrict setpoint changes, install a jumper wire

across the PROG DISABLE terminals on Terminal

Block 2, TB2. The current settings can be

displayed, but no changes can be made until the

jumper is removed. A key-operated, normally-

closed switch installed in the enclosure door will

provide temporary access to the setting functions

without opening the door.

External Alarm Reset

Wire the ARM RESET terminals on Terminal Block 2,

TB2, to a key-operated, normally-open switch.

Closing the switch turns the alarm OFF. If alarm

conditions still exist, the alarm relay re-activates in

10 seconds.

Alarm Disable

Remove the jumper on Jumper Block J5 located on

the lower-right quadrant of the circuit board, from

the ALARM mode position.

1. Reinstall the jumper in the SLAVE mode

position to operate the AUXILIARY relay in

parallel with the HI/LO CONTROL relay.

2. The AUXILIARY relay will not function if no

jumper is installed.

Note: Disabling the alarm relay reduces the

alarm function to visual display only.

Analog Output

Locate the Sensor Out Terminal Block 4, TB4, in

the upper-left quadrant of the circuit board. This

connector provides a 1 to 5-Volt DC output

proportional to the 0-to-maximum span of the

pressure sensor. This circuit requires a 10,000-ohm

load minimum.

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Donaldson Torit DFO 3-6 Specifications Page 22

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