Use the following procedure to replace the HOLD, OPEN and CLOSE indicator lamps if necessary.
Move the POWER rocker switch to the off position.
Remove the top half of the instrument enclosure if applicable.
Move the contact block release lever to the right as viewed from the front. (See figure 2.)
The lamp module is now free to slide to the rear in order to access and replace the bulb.
Turn the DPS power switch on and allow the unit to warm up for at least 10 minutes before adjusting the transmitter zero.
Temporarily disconnect the sensing line from the transmitter pressure tap. The upper display of the DPS controller should
read 0.00. Remove the front (3" x 4") cover from the transmitter and adjust the zero (upper) potentiometer, if required,
until the controller reads 0.00. Do not adjust the span (lower) potentiometer. Replace the transmitter cover and reconnect
the sensing line.
The linkage between the damper and the actuator should be installed to allow the damper to drive to a full open and closed
position. The linkage arm on the motor should have an adjustment slot to allow modification of this range. Install a
temporary jumper between terminals L1 and 41 and between L2 and 3 in order to release the controller from HOLD.
Press the MANUAL pushbutton to illuminate the OPEN and CLOSE pushbuttons. Use the OPEN and CLOSE buttons to
drive the damper actuator and adjust damper linkage. Remove the jumper wires to re-establish normal hold circuit
Press the [DISPLAY] key until the lower display reads SP. The upper display will show the current setpoint value. Use the
] key to change the setpoint value if desired. Note that by holding one key and momentarily pressing the
other the setpoint value will change by tenths rather than by hundredths. Press [DISPLAY] once more to return to the
process variable (PV) display.
SECOND SETPOINT (2SP)
The DPS can be configured to provide two local setpoints. This feature enables the Operator to preset two setpoints and
to toggle between them by pressing the [FUNCTION] key. For example, if it were desired to maintain 0.50" draft during
system warmup but use 0.20" as the normal operating setpoint, the controller would be configured as follows: