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Maintenance
Maintaining the PrecisionFlo Module
See Fig. 4 on page 9 for a description of the basic
components in a typical system equipped with a Preci-
sionFlo module.
Perform the Pressure Relief Procedure on page 42
before any service action that does not require the
module to operate.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure (page 42).
For Service and Maintenance
Information on:
See
PrecisionFlo circuit boards,
program chips, and operator
control pendant.
Appendix C
PrecisionFlo Metering Valve.
Form# 308601
other components
component
documentation
supplied with your
module
Testing the Metering Valve’s Motor
The motor test procedure is intended to verify motor
operation and the integrity of cables and connections
between the PrecisionFlo control assembly and the
metering valve motor.
The motor is only energized for 5 seconds at a time,
so position yourself where you can watch the needle
and seat on the metering valve when performing this
procedure.
CAUTION
This procedure should be conducted only by trained
personnel, since incorrect use of this procedure can
overheat and damage the motor.
1.
Perform the Pressure Relief Procedure on page 42
to ensure the module is depressurized.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure (page 42).
2.
Make sure that the panel is energized and that the
CONTROL ON light is lit.
3.
On the control pendant:
HOME
SETUP
Protected Setup
4.
Key in the password, then press
[ENTER]
.
5.
Then go to:
PROTECTED SETUP
Test Motor
6.
You see:
–––––Test Motor–––––
Setpoint Moves Shaft
Current= xxx
7.
Enter either a positive or negative percentage of
full scale current. Use the
↑
or
↓
arrow keys to
increment or decrement the value by 10%.
+ Percentage
– Percentage
opens needle
closes needle
pulls out of seat
pushes into seat
After 5 seconds, you return to the PROTECTED
SETUP screen.
8.
To repeat the test, repeat steps 5 – 7.