Series EPC-30 Current-to-Pressure (I/P) Transducer
8
Part 331276B
02
E 2010 Nordson Corporation
Troubleshooting the Electronic Section
Use a multi-meter with both continuity and resistance to troubleshoot the
transducer’s electronic section. Follow the sequence below:
1. Connect the test leads to the black and white leads on the transducer
and check for continuity.
2. Check the initial resistance, then turn the SPAN potentiometer either
clockwise (CW) or counter clockwise (CCW). The resistance will change
and should be in the range of 150−250 ohms.
NOTE: If you have continuity and the resistance changes when you turn
the SPAN potentiometer, the electronic section of the transducer is in good
working order.
Basic Calibration
ZERO Adjustment
The ZERO adjustment potentiometer is located on the front of the
transducer. For mechanical adjustment of the nozzle, adjust the ZERO
potentiometer settings.
For forward acting transducers:
S turning the settings CW decreases the output pressure on the ZERO
and SPAN adjustments.
S turning the settings CCW increases the output pressure on the
ZERO and SPAN adjustments.
NOTE: If the ZERO potentiometer is turned CCW, the nozzle moves closer
to the coil/flexure assembly via a worm and pinion gear assembly. If the
nozzle contacts the coil/flexure damage may occur. If the pitch on the zero
assembly is okay it does not need any adjustment.
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