Inputs - GE MI-869 Instruction Manual

INPUTS

Inputs
Contact Inputs
4–82
Figure 4-18: Inputs Display Hierarchy
The 869 relay is equipped with a number of Contact Inputs, depending on the Order Code,
which can be used to provide a variety of functions such as for circuit breaker control,
external trips, blocking of protection elements, etc. Contact inputs accept wet and dry
input signals. A wet type contact input signal requires an external DC voltage source. A dry
type contact input signal uses an internal DC voltage source. Depending on the DC source
level, the voltage threshold (17V, 33V, 84V, 166V) can be selected. The Contact Inputs can
be located on the HV I/O and Arc Flash cards located on slots 'F' or 'G' or 'H'.
The Contact Inputs are either open or closed with a programmable debounce time to
prevent false operation from induced voltage. The debounce time is adjustable by the user
per manufacturer specifications.
Path:
Setpoints > Inputs > Contact Inputs
The Contact Inputs menu contains configuration settings for each Contact Input as well as
voltage threshold for all Contact Inputs. Upon start-up, the relay processor determines
(from an assessment of the installed modules) which Contact Inputs are available, then
displays settings for only these inputs.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS