7 QZ 70 en
9
Valve Closed to Open in clockwise rotation, Fig. 13
1. With the valve in the "Closed" position, set the bot-
tom cam so that the metal activation strip is cen-
tered on the bottom sensor target and the top cam
is 180° from the bottom cam. Connect power supply
and ammeter to the bottom switch.
2. Lift up bottom cam and rotate clockwise until the
ammeter reads >3 mA, then rotate counter-clock-
wise until the ammeter reads <1 mA. Release the
cam.
3. Move valve to the "Open" position. Connect power
supply and ammeter to the top switch. Push down
top cam and rotate counter-clockwise until the
ammeter reads <1 mA. Release cam.
3.2
Position transmitter calibration
Type Q_5_
1. Connect the plug as shown for either clockwise or
counter clockwise to open operation (as viewed
from top), see Fig. 14.
2. Operate actuator to desired "zero" position. With
power disconnected, connect an ohm meter across
the terminals located on top of the potentiometer.
For counter clockwise rotation, connect to the termi-
nals with the black lead and white lead. For clock-
wise rotation, connect the ohm meter to the
terminals with the red lead and white lead.
3. Loosen bottom set screw and rotate coupling until
the ohm meter reads between 400–600. Retighten
set screw. Verify the ohm meter still reads between
400 - 600
Ω
.
4. Disconnect the ohm meter and connect DC power
to the + and - terminals, Fig. 15.
5. Adjust the screw on the zero trimpot for a 4 mA out-
put.
6. Operate actuator to the desired "100 %" position.
7. Adjust the screw on the span trimpot for a 20 mA
output. Zero and Span adjustments are non interac-
tive.
Fig. 12
Cams set for Normally Open function
Fig. 13
Cams set for Normally Closed function
Fig. 14
Position transmitter calibration
Fig. 15
Electrical schematic for position transmitter
calibration
2.
3.
4.
+ - 1 2 3 4
T
ransmitter
Z
E
R
O
S
P
A
N
Z
E
R
O
S
P
A
N
1.
5.
7.
NOTE
Plug Must Be at One End
of Connector or the Other
Clockwise to Open
Operation
Counter Clockwise to Open
Operation
2 Pins Visible
2 Pins Visible
24 VDC
Electrical Schematic
position transmitter
voltage supply
ammeter or analog
computer input
0 to 100%
