Rish DELTA VAF NX User Manual

8. Relay output (Optional)
8.1 Limit Switch
Limit switch can be used to monitor the measured
parameter ( Ref.Table:2 )in relation with to a set limit.
The limit switch can be configured in one of the four
mode given below:-
1) Hi alarm & Energized Relay..
2) Hi alarm & De-Energized Relay.
3) Lo alarm & Energized Relay.
4) Lo alarm & De-Energized Relay.
Hi Alarm
If Hi-Alarm Energized or Hi Alarm De-Energized option
is selected then relay will get Energized or
De-energized,if selected parameter is greater than or
equal to trip point.
# Note: For Lo-Alarm configuration, set the values
of trip point & Hysteresis such that % trip point + %
of Hysteresis should be less than 100%.
For example, if trip point is set 70% then maximum
applicable Hysteresis is 42.8%. i.e Trip point 70%
(252 ) + Hysteres is 42.8% (107.8 ) = 359.8° ° °
° then If total value is greater than the 100% i.e. 360
relay will not release.
Lo Alarm
If Lo-Alarm Energized or Lo Alarm De-Energized option
is selected then relay will get Energized or De-energized,
if selected parameter is less than or equal to trip point.
With User selectable Trip point, Hysteresis,
Energizing Delay & De-Energizing delay.
Trip point can be set in the range as specified in table
2 of nominal value for Hi-Alarm & 10% to 100 % of
nominal value for Lo-Alarm.
Trip point
Hysteresis
Hysteresis can be set in the range of 0.5% to 50 %
of set trip point .
If Hi-alarm Energized or Hi-alarm De-energized is
selected then relay will get De-energized or
Energized respectively, if set parameter value is
less than Hysteresis
Similarly if Lo-alarm Energized or Lo-alarm
De-Energized.
Energizing Delay
The energizing delay can be set in the range from 1
to 10 sec.
Note : In case of low alarm if trip point is set greater
than 80% then the maximum hysteresis can be set
such that the total Trip point+ Hysteresis(% of trip
point value) will not exceed 120% of range.
For example :If trip point is set at 90%, then
maximum 33.3% hysteresis should be set such that,
[90 + 29.99 (33.3% of 90)] = 120
Example of Different Configuration
Parameter No. 4 (Current1)
Trip Point = 50%
Hysteresis = 50% of trip point
De-Energizing Delay
The De-energizing delay can be set in the range
from1 to 10 sec.
Energising Delay:2S
De-energising Delay:2S
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Rish DELTA VAF NX Specifications

General

Brand	Rish
Model	DELTA VAF NX
Category	Measuring Instruments
Language	English