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GWA – 250
Electrical connection
The electrical connection of the device must be carried out according to the respective country specific
standards. Incorrect installation or adjustment could cause applicationally conditioned risks.
Power supply input, measuring input and relay output channels are safe galvanically isolated from each other.
This is also valid for both relay output channels among each other.
Connection of the signaling transmitter resp. measuring transducer – measuring inputs
For the two, three or four-wire connection cable between the limit value switch and the signaling transmitter
resp. measuring transducer a standard installation cable or multi-wire cable for measuring intends with a
maximum of 25 Ω per wire can be used.
The use of a shielded signal cable is recommended, if strong electromagnetic influences could happens, e.g.
due to machines or radio equipment. In that case the shielding of the cable should be connected to earth only at
the side of signaling transmitter resp. measuring transducer.
The signal cable should be installed separated from power leading wires.
The connected signaling transmitter resp. measuring transducer can be powered by the integrated measuring
transducer supply. The supply is overload and short circuit protected.
The maximum values of the inputs at the limit value switch GWA – 250 (current input maximum 400mA - 30V /
voltage input 50V) must not be transgressed. The current input is equipped with a self resetting fuse.
At activation of the fuse the signal current wire must be disconnected for app. 5 seconds.
If more than two limit values to a standard signal (V / mA) should be evaluated at the limit value switch
GWA – 250, additional devices could be connected in series (mA) resp. in parallel (V).
At a current signal, the signal must be feed to both current inputs (2 – I-In / 1 – GND) in series. At a voltage
signal, the reference terminal (1 – GND) and the signal input (3 – U-In) of the limit value switches must be
connected together.
At the type GWAP – 250 a signal sided (Pt100) device coupling is not possible.
Connection of the signaling and control equipments – relay outputs
Inductive loads at the relay contacts, e.g. auxiliary contactors or magnetic vents may only be used with a free-
wheeling diode or a RC protection circuit to avoid high voltage peaks.
For inauguration it is suggested, to deactivate all connected control devices, to avoid unwanted control
reactions.
Connection of the power supply voltage
Due to the integrated wide range power supply, for connection to supply voltages from 20...253V AC / DC, the
limit value switch is suitable for using in all common energy supply networks.
The connection is reverse polarity protected.
A fuse is integrated internally at the power supply circuit. Due to this the installation of a fine protection is not
necessary.
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