CHAPTER 5: DEVICE, SYSTEM, INPUT AND OUTPUT SETPOINTS INPUTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 5–87
As an example, following section shows description of the settings for Slot F with order
code ‘A’, Slot G with order code ‘B’ and Slot B with order code ‘C’.
Contact input card type ‘A’ allocated at Slot F requires one Voltage Threshold configuration
for all the contact inputs. Contact input card type ‘B’ allocated at Slot G has two groups of
five contact inputs and therefore requires two Voltage Threshold settings. While Contact
input card type ‘C’ allocated at Slot B has three groups of five contact inputs, and therefore
requires three Voltage Threshold settings.
Each Voltage Threshold setting is distinct by the slot or terminal numbers. For example:
‘Voltage Threshold/Slot F’ specifies the threshold setting of all the contact inputs in Slot F
with order code ‘A’; while ‘Voltage Threshold/G13-G17’ specifies the threshold setting for
group of five contact inputs with terminals G13 to G17.
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.
VOLTAGE THRESHOLD /[X]
Range: 17, 33, 84, 166 VDC
Default: 33 VDC
The setting determines the minimum voltage required to detect a closed Contact Input.
The value is selected according to the following criteria: 17 for 24 V sources, 33 for 48 V
sources, 84 for 110 to 125 V sources and 166 for 250 V sources.
FAST PATH:
For internal wetting set the Voltage Threshold to 17V.
FAST PATH:
When thresholds above 17V are selected, the internal +24V is disabled.
Path: Setpoints > Inputs > Contact Inputs > Contact Input X
NAME
Range: Up to 13 alphanumeric characters
Default: CI 1
An alphanumeric name may be assigned to a Contact Input for diagnostic, setting, and
event recording purposes. The CI X ON (Logic 1) FlexLogic operand corresponds to
Contact Input “X” being closed, while CI X OFF corresponds to Contact Input “X” being
open.
DEBOUNCE TIME
Range: 0.0 to 16.0 ms in steps of 0.5 ms
Default: 10.0 ms
The Debounce Time defines the time required for the contact to overcome ‘contact
bouncing’ conditions. As this time differs for different contact types and manufacturers,
set it as a maximum contact debounce time (per manufacturer specifications) plus some
margin to ensure proper operation.
EVENTS
Range: Enabled, Disabled
Default: Enabled
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