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Tech Note 105: Reversing Normal Thrust Direction CMCP545(A)
Last Updated: 05/10/2017
Reversing Normal Thrust Direction (CMCP545)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:

Thrust Direction Jumpers



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