Digital Inputs - GE D25 User Manual

D25
User's Manual
Power Supply,
Continued
• An IEC
Power Supply
complying with IEC 60947-1/60947-3) must be as electrically close as practical
Source
to the D25 power supply.
• For the switching power supply to operate correctly, the input voltage must be
within specified limits prior to turning on the power switch.
• DC power supply modules draw an inrush current upon start-up.
−
Use the field supply outputs only when external supplies are not available.
•
−

Digital Inputs

Note: The inputs of all variants of the S Cards are not polarity sensitive: they
Digital Input
Module
are bipolar, and are isolated from the D25's internal power supply.
Digital Inputs The D25 can have up to 96 digital inputs in three banks of 32:
• Digital Inputs 1 to 32 are on connectors A and B
Digital Inputs 33 to 64 are on connectors C and D
•
• Digital Inputs 65 to 96 are on connectors E and F
Wetting Types All digital inputs require an input voltage signal large enough to turn on an
optical switch. The input levels required for each D25 digital input card type
are shown in the table below.
• Low Voltage Digital Input cards can each be set to use:
−
−
−
• High Voltage Digital Input cards can each be set to use:
−
−
34
®
60947 compliant main disconnect switch (or other equivalent device
Ensure the field source can supply this start-up current without overloading.
Use of an external supply improves immunity to EMI and increases power
supply efficiency.
Externally routed PSU supplied wetting (Supplied Wetting)
External wetting
Externally applied input voltage (Voltage Detect)
External wetting
Externally applied input voltage (Voltage Detect)
994-0081-3.00-21
GE Grid Solutions
GE Information