|
CMCP545(A)
Transmitters and Monitors ship standard with "upscale towards probe".
To change the upscale direction on a CMCP545 from normally towards the probe to
normally away and where the range option calls out either +/- 40 mils or 0-80
mils, use one of the two methods listed below.
Method
1:
If the
actual reading, corresponding to the currently existing thrust position, and
associated proximity probe output voltage (within the 80 mil total range limit)
is accurately known, the following procedure may be used.
1. Move
the direction jumpers on the circuit board to positions E1 and E4 (the two end
positions).
2. Adjust
the “zero” potentiometer located on the front of the unit directly under the
input terminals, until the output-reading / output-current matches the know
thrust position reading. Note: This may take up to 10 turns of the
potentiometer.
Method
2:
After
performing this change, an output reading of 20.00 mA will correspond to an
input of -18Vdc, and an output reading of 4.00 mA correspond to and input
voltage of -2.00 Vdc. This is a total range of 80 mils, centered at
-10Vdc.
1. Move
the direction jumpers on the circuit board to positions E1 and E4 (the two end
positions).
2. Use a
DC power supply to input -18.00 Vdc at the “+” input terminal.
3. Monitor
the output current with a good digital meter, and adjust the “zero”
potentiometer located on the front of the unit directly under the input
terminals, until the output current reads 20.00 mA. Note: This may take up
to 10 turns of the potentiometer.
Location
of Jumpers:
|
