Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual User Manual
Page 44
Figure 4.3
Typical Connection of AC Input Power Wiring for Three Paralleled Units of
Model 8720MC-RPS027 and 8720MC-RPS065
4-6
Wiring
MC3
L
1
L
2
L
3
P
N
G
L
1AUX
L
2AUX
L
3AUX
PR1
PR2
PR3
MC1
MC2
8720MC-RPS
Regenerative Power
Supply Unit 3
(Slave Unit 2)
8720MC-RPS
Regenerative Power
Supply Unit 2
(Slave Unit 1)
8720MC-RPS
Regenerative Power
Supply Unit 1
(Master Unit)
MC2
L
1
L
2
L
3
P
N
G
L
1AUX
L
2AUX
L
3AUX
PR1
PR2
PR3
MC1
MC2
MC1
L
1
L
2
L
3
P
N
G
L
1AUX
L
2AUX
L
3AUX
PR1
PR2
PR3
MC1
MC2
PWR
MC
24V
MC1
MC3
CB3
CB2
MC2
Circuit
Breaker <4
(CB3)
Line Filter <6
for AC
Input
Power
Line Filter <6
for AC
Input
Power
Line Filter <6
for AC
Input
Power
Single-phase
Line Filter
Circuit
Breaker <4
(CB2)
Circuit
Breaker <4
(CB1)
Main
Magnetic
Contactor
(MC3)
Main
Magnetic
Contactor
(MC2)
Main
Magnetic
Contactor
(MC1)
Reactor
(L3)
Reactor
(L2)
Reactor
(L1)
380 to
460 VAC
100 to 115 VAC
or
200 to 230 VAC
Protection
Fuse <2
Protection
Fuse <2
Protection
Fuse <2
Terminals P and N
of Load Equipment
Harmonic
Filter
RUN On/Off
1> The phases of the AC input power to the main supply terminals L
1
, L
2
and L
3
must be same as those of the control power to the control power terminals
L
1AUX
, L
2AUX
and L3
AUX
. The phases of the control power L
1AUX
, L
2AUX
and L3
AUX
for the slave unit(s) must also be same as those for the master unit.
2> It is recommended to install the DC bus protection fuses on the both lines to the terminals P and N to prevent ground fault, when more
than one drive is connected to the 8720MC-RPS Regenerative Power Supply.
3> Turn ON the switches SW7-1, SW7-2 and SW7-3 on the Regulator Board without fail.
4> Both a three-phase circuit breaker and fuses are not required. Check your local code to determine if fuses should be used instead of a circuit breaker.
5> The slave circuit breaker must be provided with an auxiliary contact as a safety interlock to the master. Use fuses with a slightly higher current rating
if your local code requires them.
6> When the 8720MC-RPS Regenerative Power Supply must comform with the requirements of CE Mark, install a line filter in the AC input power line and
a single-phase line filter in the power supply line to the main magnetic contactor.
7> The length of the DC bus wiring runs should not exceed 2 meters. It is also recommended to use Bus bar for the common bus sized to 1.75 times the total
continuous current output of the RPS units.
8> The length of the wiring in the cabinet must be as short as possible.
9> The length of the wiring from the E terminal of the Harmonic Filter to the Grounding Terminal must be as short as possible.
10> The physical location of the Harmonic Filter and Varistor relative to the Contactor and Line Reactor is important. Connect these devices in the relative positions
shown in this illustration.
11> Because driving current of sequence input signals is 5mA and below, use a contact of which minimum applicable load is 5mA and below.
12> Use the reactor in maximum surrounding air temperature of 55 degree C (131 degree F) and below.
Varistor
Harmonic
Filter
Harmonic
Filter
Varistor
Varistor
Fuse <4
for
Power
Supply
Fuse <4
for
Power
Supply
Fuse <4
for
Power
Supply
<9, 10
<12
<1
<12
<12
<7
<5, 11
<9, 10
E
<9, 10
<6
E
E
CB2
MC2
MC1
MC3
CB3