Voltage Transformer Ratio; Current Transformer Primary - Eaton Cutler-Hammer IQ DP-4000 Installation, Operation And Maintenance Instructions

IQ DP-4000
SECTION 5 - PROGRAMMING THE IQ DP-4000
Switch SW1 Nos. 3 , 4, 5, and 6
line voltage. Set the switches according to Table 5 . F.
Follow the table's line-to-line column when the wiring
configuration of the AC line is 3-wire. Use the line-to­
neutral column when the AC line configuration is 4-wire.
CJ
•= OFF = ON
Table S. F AC Line Voltage
5.6 VOLTAGE TRANSFORMER RATIO SETPOINT
Some systems may include optional, user-provided
potential voltage transformers (this is required above
600V). You must take these ratios into account by using
switch SW1 No. 7, and the eight switch settings for
Nos. 1 to 8. See Appendix A for a listing of the available
PT ratios, and their corresponding settings.
5.7 CU RRENT TRANSFORMER PRIMARY
SETPOINT
The primary winding of the user-provided external
current transformers can vary from 5 amps to 1 2,800
amps; the secondary winding is assumed to be 5 amps.
Switch SW1 No. 8, and the eight switch settings
Nos. 1 to 8 , must correspond to the external current
transformer's primary rating. See Appendix A for a
listing of the available CT primary ratings, and their
corresponding settings.
5.8 PHASE SEQ U ENCE SETPOINT
The IQ DP-4000 can be programmed to correspond to
either a nominal ABC or CBA sequence, by a single
switch SW4 No. 1 . A power system with an ABC
sequence has phase A leading phase B by 1 20
24
specify the nominal AC
SW2
SW3
A system with a CBA sequence has phase C leading
phase B by 1 20 degrees, and phase B leading phase A
by 1 20 degrees.
Set switch in the:
SW4 No. 1
·
OFF position for an ABC sequence
•
ON position for a CBA sequence
•
5.9 DEMAND SETPOINTS
If you set up the IQ DP-4000 to use an internal sync
pulse (see Section 5 . 1 5.2) , you must determine the type
of demand, and time interval for the demand window.
The present demand and peak demand are computed
for the following parameters:
Current Related Parameters. For the current related
•
parameters, the demand calculation is always
based on a fixed window. Section 5.9.3 describes
programming the current demand times.
current related parameters are:
- lA Amps
- Is Amps
- lc Amps
Power Related Parameters. For the power related
•
parameters, the demand can be based on either a
fixed or sliding window. See Section 5.9. 1 tor
selecting a fixed or sliding demand window and
Section 5.9.2 for programming the power related
demand times. The power related parameters are:
- Watts
- Vars
- VA
TD1 7548A
The