GE Grid Solutions
D25
User's Manual
GE Information
994-0081-3.00-21
41
Control Outputs
Control Module
The control module can be configured for two basic modes of operation:
•
Trip/Close (T/C) – excluding D25 High Current KE Control Card
•
Digital Output (DO)
Any other type of operation, such as Raise/Lower, uses the Digital Output
hardware configuration.
T/C or DO
(R/L) Sensing
D25 software detects what type of digital output command has been received,
and uses the Master Trip and Master Close relays when appropriate.
External jumpering is provided to route the external Control Voltage through
the correct relays for each mode of operation.
Fuse
Monitoring
The control module includes circuitry that detects the presence of control
voltage on the load side of the fuses. Software in the D25 Plant I/O
Subsystem (P097 V2.30 or greater) responds to the signal from the control
module and creates a pseudo digital input that can be seen in the D25 System
Point Database.
If a fuse opens, or the control voltage is removed from the digital output
module for any reason, the pseudo digital input (DI) for that module will
change state and set an alarm.
If the control module is not present, the pseudo DI point will remain in the
Off
state.
Note 1:
The fuse monitoring circuitry can only detect a control voltage above
approximately 10 Vdc. If the control voltage is less than this level,
the fuse monitoring circuitry will not sense any voltage, and the
pseudo DI point will remain in the
Off
state.
Note 2:
Fuse monitoring works with positive or negative grounded systems.
Note 3:
For D25s with Plant I/O Version 2.30, the fuse-monitoring feature
will only work with DC control voltages. Versions greater than 2.30
support AC control voltage monitoring
.
Note 4:
The D25 High Current Control Card does not have a fuse and a fuse
monitoring circuit.
!
Caution
The fuse monitoring circuitry has been engineered to detect control voltages
up to the supported maximum specifications of the module.
Do not
exceed
this level of control voltage. Damage to the module may result.
Note
The D25 KE control module
does not
require hardware configuration to use
the fuse-monitoring feature.
Summary of Contents for D25
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