IQ DP-4000
SECTION 5 - PROGRAMMING THE IQ DP-4000
5.15.3.3 Load Shed Settings, Parameter Selection
The load shed feature activates the pulse initiator relay
when
a
user-selected
parameter
exceeds
a
preprogrammed range (see Section 5. 1 5.3.2). Select
one of the following parameters to monitor:
•
Watts - Metered or Demand
•
VA - Metered or Demand
•
Metered Currents - lA,
Is,
lc, or average
•
Demand Currents- lA, Is, lc, or average
See Table 5.Z for selecting the parameter to monitor
with the load shed feature.
•= OFF
D
= ON
Table 5.Z Load Shed Parameter Selection Settings
5. 15.3.4 Pulse Initiator Settings, Rate Selection
For this function, select the rate at which the relay
changes state as a value of energy to track with the
pulse initiator. For example, if you choose Watt-hours
as the parameter to track with the pulse initiator, the
IQ
DP-4000 will change the state of the relay at every
specified interval of Watt-hours. If 50 Watt-hours per
Pulse is selected, the relay changes state every time 50
Watt-hours accumulate.
The energy per pulse corresponds to the energy (in
units), at the
secondary
winding of the PTs and CTs.
Therefore, you must consider the user-selected CT and
PT ratios when selecting the Energy per Pulse value.
See Table 5.AA for selecting the rate at which the pulse
initiator relay changes state.
Example: A system has the following configuration:
CT = 1 400:5
PT = 240: 1 20
38
TD1 7548A
The IQ DP-4000 is monitoring a constant power of
1 6,800 Watts.
Watt-hours is selected as the parameter for the pulse
initiator setting.
The CT ratio is 1 400
I
5 = 280
The PT ratio is 240
I
1 20 = 2
The power at the secondary of the CTs and PTs is:
1 6,800 Watts
I
280 x 2 =
1 6,800 Watts
I
560 =
30 Watts (or 30 Watt-hours in 1 hour)
•
If the energy per pulse is set to 1 , each pulse will
equal 560 Watt-hours.
1 400 x 240 x 1 = 560 W att-hours per pulse.
5
1 20
•
If the energy per pulse is set to 7, each pulse will
equal 3,920 Watt-hours.
1 400 x 240 x 7 = 3920 Watt-hours per pulse.
5
1 20
•= OFF
D
= ON
Table 5.AA Pulse Initiator Rate Selection Settings
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