GE Grid Solutions
GE Information 994-0081-3.00-21
Digital Inputs, Continued
Digital Input
Thresholds
The table shows the on and off state thresholds for each of the listed D25
digital input card options. Before connecting field wiring, refer to the table to
determine the suitability of the installed option.
Verify that inputs do not exceed the maximum overload voltage, or damage to
the card may result.
Card Type 32 Input
Part #s
On Threshold Off Threshold Overload
Voltage
Max. Power
Dissipation/
Input
Low Voltage Digital Input Cards
12V / 5 mA 517-0485 >8 V <4 V 16.8 V 130 mW
24V / 5 mA 517-0486 >18 V <10 V 33.6 V 210 mW
24V / 10 mA 517-0490 >18 V <10 V 33.6 V 530 mW
48V / 5 mA 517-0487 >35 V <16 V 67.2 V 470 mW
High Voltage Digital Input Cards
120V / 1.6 mA 517-0488 >80 V <40 V 144 V 290 mW
250V / 1.2 mA 517-0489 >160 V <80 V 300 V 450 mW
Note
The inputs of all variants of the D25 digital input cards are not polarity
sensitive: they are bipolar, and are isolated from the D25’s internal power
supply.
Fuse
Monitoring
D25 digital input modules include circuitry that detects the presence of
wetting voltage after it has passed through the fuse F1.
Software in the D25 Plant I/O Subsystem (P097 V2.30 or greater) responds to
the signals from each of the three D25 digital input modules and creates
pseudo digital inputs that can be seen in the D25 System Point Database.
If fuse F1 opens or the wetting voltage is removed from the digital input
module for any reason, the pseudo DI for that module will change state and
set an alarm. If a D25 digital input module is not present, the pseudo DI point
will remain in the Off state.
Note: Fuse monitoring can only detect a wetting voltage if the D25 digital
input module is configured for supplied or external wetting.
If the module is configured for voltage detect the fuse monitoring
circuitry will not sense any wetting voltage, and remains in the Off
state
To Next Page
Loading...
Need help?
General
