Specifications

10/31/02 Tech-304/DWO 14195 Page 27 of 39
5.2 Common Problems
Listed here are some common problems encountered with the ICoT positioner. Possible
causes are given and steps to help rectify the problem are offered.
5. Supply Pressure
The supply pressure should be regulated
appropriately with regard to the actuator. If
there is question as to the proper supply pres-
sure, the actuator manufacturer should be
contacted.
6. Positioner Pressure Rating
If the supply pressure is above 40 PSI a high
pressure ICoT positioner must be used. If the
supply pressure is below 40 PSI a low pres-
sure ICoT positioner must be used.
(See Ordering Guide - Section 2.1)
The positioner should be given a mini-
mum of 14 VDC. The voltage across the
positioner can be checked by removing the
cover and connecting a voltmeter across
TP1 and TP2 on the display board.
1. The LCD remains blank even after power
is applied to the positioner.
May need to be calibrated.
Beacon may be mis-oriented.
2. The positioner has power but the position
as shown on the LCD does not seem to
match the actual position of the actuator/
valve.
The gain settings are to high for the actua-
tor/valve assembly. Enter the calibration
mode and reduce the PCAL, ICAL and
DCAL settings.
3. The positioner is properly set-up, and air is
applied to the positioner. When powering
up the positioner, the actuator goes into a
state of constant oscillation.
The flow characteristic during calibration
was set to equal percentage or quick open-
ing, not linear. If linear is desired enter
calibration and make this change (See Cal-
ibration Instructions section 4.1 & 4.2).
4. After a successful calibration, position and
set point as shown on the LCD does not
match the input signal.
5. After removing power to the positioner
there is full pressure to output port 1 and
zero pressure to output port 2.
On loss of power the positioner fails full
air pressure to output port 2. If this does
not happen the positioner is damaged.
Contact factory.
In the case of a rotary application, the bea-
con may be mis-oriented.
In the case of a rotary application, the
actuator may not have enough rotation.
The positioner requires the actuator to
stroke a minimum of 45 degrees.
In the case of a linear application, the
feedback magnet assembly needs to be
ordered specific to the stroke of the actua-
tor and the fail direction of the actuator.
(See figure 5-1 & 5-2).
6. An Err 6 (Calibration Error) is returned
during a Lo or Hi Calibration.
This messages indicates a deviation
between position and set-point. This error
message does not clear itself after the
problem ceases, therefore, try clearing the
message. See Appendix A.1 “Procedure to
Clear Err 5”
If the Err 5 returns, make sure all the pre-
liminary checks, as described earlier in
this section, have been made. If still the
cause for the Err 5 can not be diagnosed,
call the factory for help.
7. An Err 5 (Integrator Overflow) message
is shown on the display.