Woodward MRM4, Руководство пользователя

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Installation and Connection
DI-4 X - Power Supply and Digital Inputs
Make sure, that the tightening torque is 0.56-0.79 Nm [5-7 In-lb].
This assembly group comprises:
•
A wide-range power supply unit;
•
4 digital inputs, grouped; and
•
24V DC (for options with Woodward Devices only).
Auxiliary voltage supply
•
The aux. voltage inputs (wide-range power supply unit) are non-polarized. The device could be provided
with AC or DC voltage.
Digital inputs
For each digital input group the related voltage input range has to be
parametrized Wrong switching thresholds can result in
malfunctions/wrong signal transfer times.
The digital inputs are provided with different switching thresholds (can be parametrized) (two AC and five DC in-
put ranges). For the six grouped (connected to common potential) inputs and the two non-grouped inputs the
following switching levels can be defined:
•
24V DC;
•
48V DC / 60V DC;
•
110 V AC/DC; and
•
230 V AC/DC.
If a voltage >80% of the set switching threshold is applied at the digital input, the state change is recognized
(physically “1”). If the voltage is below 40% of the set switching threshold, the device detects physically “0”.
The ground terminal has to be connected to the »-pole« when using DC
supply.
Use of the 24 V DC Output is prohibited. This output is exclusively for
factory testing and commissioning.
Page 32 EN MRM4 01/11