Regada MO 3, Installation, Service And Maintenance Instructions

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26 MO 3, MO 3.3, MO 3.4, MO 3.5
Note:
The output signal of (0-20mA, 4-20mA or 0-5mA - according to the specification) can be adjusted at the range
from 85 up to 100% of the rated stroke according to table Nr.3. At values less than 85% the value of the output
signal is reduced proportionally.
4.7 Adjustment of Capacitive Transmitter CPT1/A (Fig.12)
The chapter describes adjustment of the capacitive transmitter to the specified parameters (standard
values of output signals) in case they are reset. The capacitive transmitter (95) serves as a position transmitter of
electric actuators with unified output signal of 4÷20 mA in electric actuators
MO , or as a feedback of a position
controller, or if required it functions also as a remote position transmitter of electric actuators with unified output
signal of 4÷20 mA in electric actuators
MO with controller.
Before adjusting the transmitter, terminal position switches S3 and S4 must be adjusted.
Note1: With the version with controller ; at using the output signal, this signal isn’t galvanic insulated from the
input signal !
Note2:
In case that reversed output signals are needed (in the position ”OPEN” minimum output signal) contact
personnel of service centres.
The capacitive transmitter CPT1/A is adjusted by the producer to the fixed Operating angle according to
the order and wired according to the wiring diagrams placed into the cover. Check the power supply of the user
after connecting to terminal of the terminal board before the transmitter is electrically checked. Adjustment of the
capacitive transmitter can be performed when the position switches are adjusted. The adjustment is performed
with the power supply of 230 V/50 Hz and ambient temperature of 20
±
5°C.
The following versions of electric actuators with built capacitive transmitters can be specified:
A) The version without any power supply (2-wire version) for EA MO
B) The version with a power supply (2-wire version) for EA MO
C) The version CPT as a feedback to the position controller for EA MO with controller
A.) Adjustment of the Capacitive Transmitter without any Power Supply
Before connecting check external power supply. The measured voltage should be in range from 18 up to
28 V DC.
The voltage of the power supply must not be in any case higher than 30 V DC . The transmitter can
be irreversibly damaged!
While checking or adjusting the output signal of 4÷20 mA follow these steps:
•
Connect a mA meter of precision class 0,5 and loading resistance lower than 500
Ω
serially with the
transmitter (pole “-“; terminal 82).
Put the actuator to the position ”CLOSED”, the signal value should decrease. In the case that the value of
the signal increases, release the fixation screws (96) and turn the transmitter until the value starts to
decrease.
•
Check the signal value for the position ”CLOSED” (4 mA).
•
Tune the signal with loosening the fixing screws (96) and turning the trimmer (95) until the required value of
4 mA is reached. Tighten the fixing screws.
•
Put the actuator to the position ”OPEN”, the signal value should raise.
•
Check the signal value for the position ”OPEN” (20 mA).
•
Tune the signal with turning the trimmer (97) until the required value of 20 mA is reached.
•
Check the signal value for the position ”CLOSED” and then for the position ”OPEN”.
•
Repeat the procedure until the change from 4 to 20 mA is reached with deviation less then 0,5 %.
•
Disconnect the meter and lock the screws with a varnish.
B.) Adjustment of the Capacitive Transmitter with the Power Supply
While checking or adjusting the output signal of 4÷20 mA follow these steps:
•
Check the power supply: 230 V AC ±10% on the terminals 1,61.
•
Connect a mA meter of precision class 0,5 and loading resistance lower than 500
Ω
on the terminals 81, 82.
•
Follow the procedure described in the previous chapter A.
!