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IQ DP-4000
SECTION 5 - PROGRAMMING THE IQ DP-4000
Reset Threshold
=
0%
Reset Threshold - 0 to 100%
i
Reset Threshold
=
1 00%
Figure 5.3 Voltage Phase Unbalance Detection and Reset Levels
Example 1
A system has the following settings:
Nominal AC Line Voltage
=
208 V
Voltage Phase Unbalance Detection Level
=
1 5%
Reset Threshold
=
75%
For this system a voltage phase unbalance alarm occurs
when any 2 phases have a voltage difference greater
than:
208V
X
1 5%
=
31 V
The voltage phase unbalance alarm resets when all 3
phases are within:
3 1 V - ( 3 1 V x 75%)
=
8V of each other
Example 2
A system has the following settings:
Nominal AC Line Voltage
=
480 V
Voltage Phase Unbalance Detection Level
=
25%
Determine the reset threshold setting for the voltage
phase unbalance alarm to reset when all 3 phases of
voltage are within 84V of each other: The voltage phase
unbalance alarm will occur when any 2 phases have a
voltage difference greater than:
480V
X
25%
=
1 20V
84V
=
1 20V - 1 20V x RST
1 20V x RST
=
1 20V - 84V
1 20V x RST
=
36V
RST
=
36V
I
1 20V
=
0.3
In this case, set the reset threshold to 30% .
TD1 7548A
Maximum Deviation Between Phases
=
Nominal Voltage x (0-40%)
Reset Threshold
=
50%
Maximum Deviation Between Phases
=
0
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