IM-P343-44 CTLS Issue 520
EP500 Standard Electropneumatic Positioner
Feed the EP500 with a current input of 4 mA, turn the ZERO (green knob), till it reaches the
value of the desired pressure and the valve opening reaches the starting position.
Feed the EP500 with an input current of 20 mA, turn the SPAN (red knob), until it reaches the
desired pressure and the valve is fully opened or reaches the desired opening percentage
according to the application requirements.
In order to rene the values of ZERO and SPAN repeat the operation more times till the required
conguration is achieved.
Split range operation
EP500 may be split ranged to sequentially actuate two valves from one control signal e.g.:
Valve 1 Set 4 - 12 mA,
Valve 2 Set 12 - 20 mA.
Split ranging is achieved by adjustment of the zero and travel settings as described above.
4.3 Calibration
Fig. 21
SPAN regulation
ZERO regulation
OUT gauge
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