D25
User's Manual
GE Grid Solutions
36
994-0081-3.00-21
GE Information
Digital Inputs,
Continued
Digital Input
Field
Connections
Field wiring for all variations of Digital Input modules are made through two
FACE-40 connectors for each module on the backplane of the D25 enclosure.
These connectors are provided
only
if a digital input module is installed in the
D25.
Digital Input
Wetting
Selection
Wetting supply source
must
be provided externally and independently for
each digital input card.
To use external or supplied wetting:
•
Connect external wetting supply to pins 1 and 2 on FACE-40 Connector A, C
and/or E.
To use the voltage detect input:
•
Connect (jumper) pins 1 and 2 on Connector A, C and/or E for each module(s).
Note
:
Internal wetting voltage to Digital Cards is no longer available. Please
refer to Product Bulletin PRBT-213.
!
External Power
Sources
While all of the 32 inputs are bipolar and not polarity sensitive, the “B” sides
of all inputs are linked together.
•
Use care when connecting multiple external power sources.
For external wetting, the three digital input modules can have independent
wetting configurations and wetting voltage sources.
Digital Inputs
Supplied
Wetting
(Externally
routed)
Supplied Wetting is when the voltage applied to the inputs originates from the
power supply internal to the D25, routed externally to the DI Cards. The
digital input is “turned on” simply by closing a contact across the two input
termination points.
Connections for digital input point number 1.
DI Connector A
1 2 3 4 39 40
Input #1
Contacts
Power Supply Term. Block
1 2 3 4 5
+ Wetting
- Wetting
Notes
This option is available for 24 and 48V low-voltage DI cards,
only.
Supplied
Wetting option is
not
available if the Graphics Display panel is installed
because it reduces the isolation, increasing the D25 unit’s susceptibility to
EMI and transient interference.
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