Specifications

10/31/02 Tech-304/DWO 14195 Page 26 of 39
Section 5 - Trouble Shooting
5.1 Preliminary Checks
Before operating the positioner check the following:
1. Voltage
The positioner requires a 24 volt DC (nomi-
nal), 4-20 mA current loop.
2. Electrical Connection
Check the polarity of the 4-20 mA current
loop. The ICoT terminal strip visually desig-
nates the positive and negative terminal
points for connection with a “+” and “-”,
respectively.
3. Pneumatic Connection
Single Acting: Output port 1 should be piped
to drive the actuator away from the valves
fail position. Output port 2 should be
plugged. (See Section 3.3)
Double Acting: Outport port 1 should be
piped to drive the actuator away from the
valves fail position. Output port 2 should be
piped to drive the actuator towards the
valves fail position. (See Section 3.3)
4. Magnetic feedback to the Positioner
Rotary Positioner: The magnetic beacon
should be set in the proper orientation, based
on the direction of failure. (See Section 3.1)
Linear Positioner: The magnetic assembly
supplied with the positioner should corre-
spond to the stroke length and failure direc-
tion of the actuator. To make sure you have
the appropriate magnet assembly, check the
part. The stroke length and failure direction
should be printed on the part. On older
ICoTs the magnet assembly is not printed
with this information, although there should
be a serial number. Contact the factory with
the serial number to verify that it is correctly
matched to the actuator. (See Figure 5-1 &
Figure 5-2).
S
N S
N S
NS
N
Polarities of Magnetic Feedback Assemblies
(For Linear ICoT Positioners)
FAIL-DOWN
(Actuator Fails in Direction A)
FAIL-UP
(Actuator Fails in Direction B)
Direction B
Direction A
Figure 5-1
"A"
GREATER THAN 1.0" UP TO 1.5"
GREATER THAN 1.5" UP TO 2.0"
GREATER THAN 2.0" UP TO 2.5"
GREATER THAN 2.5" UP TO 3.0"
2.5
3.0
3.5
4.0
4.5
SW-30057
SW-30056
SW-30054
SW-30053
GREATER THAN 0.5" UP TO 1.0"
SW-30055
STROKE LENGTH OF
ACTUATOR/VALVE
DIM
"A"
MAGNET ASSY'
PART#
Figure 5-2