GE D90 Plus Instruction Manual page 65

CHAPTER 3: INSTALLATION
NOTE:
Contact outputs wiring
NOTE:
Contact input/output module configuration
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
other contact input terminal. The maximum external source voltage for this arrangement
is 300 V DC. The voltage threshold at which each group of four contact inputs will detect a
closed contact input is programmable as from 24 to 250 V DC.
Figure 30: Dry and wet contact input connections
Wherever a tilde "~" symbol appears, substitute with the slot position of the module.
Contact outputs may be ordered as form-A or solid-state relays. Depending on the module
ordered, these contacts may be connected for external circuit supervision. These contacts
are provided with voltage and current monitoring circuits used to detect the loss of DC
voltage in the circuit, and the presence of DC current flowing through the contacts when
the form-A contact closes. If enabled, the current monitoring can be used as a seal-in
signal to ensure that the form-A contact does not attempt to break the energized inductive
coil circuit and weld the output contacts.
There is no provision in the relay to detect a DC ground fault on 48 V DC control power
external output. We recommend using an external DC supply.
There are six types of contact input and output modules available for the D90
• Type A: eight contact inputs, four form-A contact outputs with voltage and current
monitoring.
• Type B: eight contact inputs, four solid-state (SSR) contact outputs with voltage and
current monitoring.
• Type C: eight contact inputs, four form-A contact outputs.
• Type D: four contact inputs, eight form-A contact outputs.
• Type E: 23 contact inputs
• Type F: 12 form-A contact outputs.
The terminal block pin assignments for all module types are shown in the figure and table
below.
ELECTRICAL INSTALLATION
Plus
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