Woodward MicroNet TMR 5009, Installation/Hardware Manual

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5009 Installation/Hardware Manual 85580V2
44 Woodward
Contact wetting voltage can be supplied by the control or from an external
source. 24 Vdc contact wetting voltage is available on each DTM (with isolation
diodes on the power and common lines). Optionally, an external 18–32 Vdc
power source or an external 100–150 Vdc power source can be used to source
the circuit wetting voltage. (The DTM’s CE marking only applies to the 24 V
option.) Because all discrete inputs are fully isolated, a common reference point
must be established between the input opto-isolators and the contact wetting
power source. If the 24 Vdc internal power source is used as for contact wetting,
jumpers are required between DTM terminals 33 & 34, and terminals 33 & 35. If
an external power source is used for contact wetting, the external source’s
common must be connected to the DTM’s discrete input commons (terminals 34
& 35).
Figure 4-8. Optional Internal 24Vdc Contact Wetting Configuration