Drehmo D 30 - Resistance Position Transducer B1 (Option); Electronic Position Transmitter B3 (Option)

Commissioning
29
Figure20: Mechanical position indicator
[1]
[2]
[3]
[1] Transit screw [2] Adjustable disc for position OPEN
[3] Adjustable disc for position CLOSED
Turn the indication elements to adjust the mechanical position indicator. Both discs
can be turned against each other by hand (do not unfasten the screw). For this pur-
pose, the valve must be operated to the respective limit position. If the mechanical po-
sition indication is set higher than approx. 270° or lower than approx. 90° for the selec-
ted travel, check the setting at the reduction gearing below and adjust, if required
(refer to Setting the reduction gearing for multi-turn actuators [}27]).
7.7
Resistance position transducer B1 (option)
Usually, resistance position transducer B1 adjusts itself by operation to end position
CLOSED via a slip clutch. If the resistance position transducer is not set to zero (0%)
in end position CLOSED, the zero point can be set manually by turning the shaft of the
resistance position transducer. When connecting the resistance position transducer,
the resistance value as well as the permissible load capacity are to be considered.
If the sensor potentiometer is used for connection to intrinsically safe circuits, it is im-
perative to heed the respectively valid regulations for setting up intrinsically safe cir-
cuits (IEC60079-11).
7.8
Electronic position transmitter B3 (option)
The electronic position transmitter B3 (EM5.004, EM5.005 or EM7.005) is supplied in
position CLOSED which corresponds to an analogue signal of 0/4mA. Once the
mechanical limit switches have been set, loosen the transit screw (refer to Design of
the limit switching module [}22]) of the potentiometer (the screw next to the poten-
tiometer marked in yellow) to commission the electronic position transmitter. The actu-
ator must be in position CLOSED and can now be operated in direction OPEN. As
soon as the actuator is in limit position OPEN, set the 20 mA output signal by means
of the screw [1] at the electronic position transmitter. In order to change the signal
range from 0 – 20mA to 4–20mA, a link can be installed in the electronic position
transmitter (terminals 3 and 4). For explosion-proof actuators, the electronic position
transmitter is only available in 2-wire technology within the 4 – 20mA range.
NOTICE
Damage to the mechanical components of the sensor system due to
locked transit screw.
à Also unfasten transit screw if the electronic position transmitter is not used.