Flowserve Logix 1200e LGAIM0044 - Manual (Page 25)

Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 44-25
Calibration
To calibrate the Logix 1200e or 1200e digital posi-
tioner equipped with analog output, follow the proce-
dure outlined below:
1. Wire the position transmitter in series with a 12.5 to
40 VDC power supply and a milliamp meter.
CAUTION: Do not apply a voltage greater than
40 volts to transmitter terminals or the circuit
will be damaged.
2. Be certain the direct/reverse switch is set to provide
the desired output signal action. In the DIR posi-
tion, a counterclockwise rotation of the potentiome-
ter shaft (when looking at the label side of the
potentiometer) will cause the output signal to
increase. In the REV position, a clockwise stem
rotation causes the signal to increase. Perform a
stroke calibration whenever the direct/reverse
switch is changed.
WARNING: Keep hands, hair, clothing, etc.
away from moving parts when operating the
valve. Failure to do so can cause serious injury.
3. Stroke the valve to the close position.
4. Referring to Figure 22, adjust the zero adjusting
screw with a small, flathead screwdriver until the
meter reads 4 mA DC.
5. Stroke the valve to the open position.
6. Adjust the span adjusting screw until the meter
reads 20 mA DC.
7. Stroke the valve to the closed position and recheck
the meter for 4 mA DC. Some fine tuning of the cal-
ibration may be required. Repeat steps 3 through 7
until satisfied.
Retrofitting to a Logix 1200e Digital Positioner
(with Circular Window in the Main Cover)
As shown in Figure 23, the newer model of the Logix
digital positioner has a circular window in the main
cover (as opposed to a diagonal, oblong window in the
earlier model). To retrofit Logix digital positioner to 4-
20 mA analog output, use the following procedure:
1. Remove the main cover (Figure 29).
2. Remove the lower and middle screws holding the
control board in place; discard these screws.
3. Place the analog output board on the lower portion
of the control board and secure with the two longer
screws (6 x 32 1.25-in.) provided (Figure 33).
4. Unplug the orange/red/brown or brown/red/orange
three-wire-set from the collector board.
5. Plug the orange/red/brown or brown/red/orange
three-wire-set into the correct receiver in the ana-
log output board (Figure 26).
6. Plug the three-wire set from the analog output
board into the receiver on the collector board (that
previously had held the orange/red/brown or
brown/red/orange wire-set).
Figure 22: 4-20 mA Analog Output Board
Span Adjustment
Zero Adjustment
DIR/REV Switch
Potentiometer
Connections
Control Board
Connection
Terminal Board
Connection