Specifications

WESTLOCK CONTROLS CORPORATION
280 MIDLAND AVENUE, SADDLE BROOK, NJ 07663 TEL: [phone] FAX: [phone]
www.westlockcontrols.com
1/12/10 TECH-439/D.W.O. 19024 Page 33 of 58
5 Trouble Shooting
5.1 Preliminary Checks
Before operating the positioner check the
following:
5.1.1. Voltage
The positioner requires a 4-20 mA current source,
with a minimum voltage of 9VDC at its terminals,
over-current protected up to 35VDC.
Current range: 3.2mA to 22mA, accordingly to the following table
(NAMUR NE43):
Loop Current
[mA] Electronics
Spool
valve
HART
comm
0.0 ≤ I < 3.2 OFF OFF OFF
3.2 ≤ I < 3.5 ON OFF OFF
3.5 ≤ I < 3.8 ON OFF ON
3.8 ≤ I ≤ 20.5 ON ON ON
I > 20.5 ON ON ON
5.1.2. Electrical Connection
Check the polarity of the 4-20 mA loop current
loop. The ICoT terminal strip visually designates
the positive and negative terminal points for
connection with a “+” and “-”, respectively.
5.1.3. 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: Output 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)
5.1.4. Magnetic Position Feedback
Rotary Positioner: The magnetic beacon should
be set in the proper orientation, based on the
direction of failure. (See Section 3.1)