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MO 3, MO 3.3, MO 3.4, MO 3.5 25
4.6 Adjustment of the Electronic Position Transmitter (EPV) - the Resistive
Transmitter (Potentiometer) with the Converter PTK 1
4.6.1 EPV – the 2-wire version (Fig. 10)
The position transmitter with the converter PTK1 is in the plant adjusted to have the output current signal
on the terminals 81-82 as follows:
•
in the position ”open“ ........................................ 20 mA
•
in the position ”closed“ ..................................... 4 mA
Adjustment of the EPV in electric actuators MO
If the transmitter requires a new adjustment follow these steps:
•
Put the actuator to the position ”closed“ and switch the power supply off.
•
Adjust the resistive transmitter according to the previous chapter. The resistance is to be metered on the
terminals X-Y (Fig. 10). The used
transmitter resistance is
100
Ω
.
•
Switch the converter
′
s power supply on.
•
Turn the adjusting trimmer ZERO (Fig.
10) to adjust the output current signal
rate measured on the terminals 81-82 to
4mA.
•
Set the actuator to the position ”open“.
•
Turn the adjusting trimmer GAIN (Fig. 10)
to adjust the output current signal rate
measured on the terminals 81-82 to
20mA.
•
Check the output signal of the converter
in the both limit positions, and repeat the
procedure if needed.
Note:
The output signal of 4-20mA can be adjusted at the range from 75 up to 100% of the rated stroke according to
table Nr.3 . At values less than 75% the value 20mA is reduced proportionally.
4.6.2 EPV – 3-wire version (Fig. 11)
The resistive transmitter with the converter is in the plant adjusted to have the output current signal
metered on the terminals 81-82 as follows:
•
in the position ”open”.............................................. 20 mA or 5 mA
•
in the position ”closed” ........................................... 0 mA or 4 mA
according to the specified version of the converter.
If the transmitter requires a new adjustment
follow these steps:
•
Put the actuator to the position ”closed”
and switch the power supply off.
•
Adjust the resistive transmitter according
to the previous chapter. The resistance is
to be metered on the terminals X-Y (Fig.
11). The used transmitter resistance is
2000
Ω
or 100
Ω
.
•
Switch the converter
′
s power supply on.
•
Turn the adjusting trimmer ZERO (Fig. 11)
to adjust the output current signal rate
measured on the terminals 81-82 to 0 mA
or 4mA.
•
Set the actuator to the position ”open“.
•
Turn the adjusting trimmer GAIN (Fig. 11)
to adjust the output current signal rate measured on the terminals 81-82 to 20mA or 5 mA.
•
Check the output signal of the converter in the both limit positions, and repeat the procedure if needed.
Fig. 5
Fig.10
TERMINAL „X“
TERMINAL „Y“
GAIN ZERO
Fig.11
TERMINAL „X“
TERMINAL „Y“
GAIN ZERO