Key Points To Consider When Using The Three-Phase Drive For Single-Phase Power Input - Delta IED-S Series User Manual

Appendix A. Single-phase Application | IED-S
A.2 Key Points to Consider when Using the Three-phase Drive for Single-
phase Power Input
DELTA IED-S drives have been tested and UL certified for the application of single-phase power input
under proper reduced rated capacity. To ensure operational safety and service life, pay attention to the
precautions in this document to connect the motor and load correctly.
When using the three-phase drive with single-phase power input, ensure the power input is from the
R-S (L1-L2) terminal. Due to the increase in DC bus ripple voltage and current, it is necessary to reduce
the rated output current and horsepower of the drive. In addition, approximately doubled current is
generated at the diode rectifier bridge when input current passes through the second phase, so reducing
ratings in drives becomes a consideration. The reasons for the increase in single-phase input current lie
in the conversion of three-phase current to single-phase current (√ 3) and the decrease in overall power
factor. Because of the increase in harmonic distortion of input current, the overall input power factor is
lower than that in three-phase input current. If the overall power factor is 0.7, a typical value for single-
phase power input, it is recommended to install a reactor. If the power factor is 0.9, also a typical value for
three-phase power input, it is also recommended to install a reactor. Note that if you use single-phase
power input without installing reactors, 100% input current distortion may occur.
When using single-phase input power for IED-S, set output rated current as follows:
1. Reduce output rated current to 50% if no AC reactors are installed
2. Reduce output rated current to 55% if 3% AC reactor is installed
3. Reduce output rated current to 60% if 5% AC reactor is installed
Table A.2-1: Applicable drives for IED-S with motors
Table A.2-2: Applicable drives for IED-S with motors when 3% AC reactor is installed at drive power input
Table A.2-3: Applicable drives for IED-S with motors when 5% AC reactor is installed at drive power input
Motor (kW) Input Phase
2.2 R-S (L1-L2)
3.7 R-S (L1-L2)
Motor
Input Phase
(kW)
2.2 R-S (L1-L2)
3.7 R-S (L1-L2)
Motor
Input Phase
(kW)
2.2 R-S (L1-L2)
3.7 R-S (L1-L2)
IED-S 230V
Drive's Input
Rated Current
26.4
37.4
3% AC Reactor is Installed for IED-S 230V
Drive's Drive's
Input Output Applicable
Rated Rated Drives (kW)
Current Current
20.9 12
32.3 17
5% AC Reactor is Installed for IED-S 230V
Drive's Drive's
Input Rated Output Rated
Current Current
20.9 12
32.3 17
Drive's Output
Applicable Drives (kW)
Rated Current
12
17
Reactor
3%
Saturation
Reactors
Current
(mH)
(Arms)
5.5 0.441
7.5 0.32
Applicable 3% Reactors
Drives (kW) (mH)
5.5 0.735
7.5 0.534
A-2
Line Fuse
5.5 JJN-50
7.5 JJN-80
Table A.2-1
Reactors
(Delta P/N)
43.2 N/A
55.8 DR033AP320
Table A.2-2
Reactor Saturation
Current (Arms)
43.2
55.8
Table A.2-3
Line Fuse
JJN-50
JJN-80
Line Fuse
JJN-50
JJN-80