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

1AUX

2AUX

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

1AUX

2AUX

3AUX

PR1
PR2

PR3
MC1

MC2

MC1

1AUX

2AUX

3AUX

PR1
PR2

PR3
MC1

MC2

PWR

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

200 to 230 VAC

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

, L

and L

must be same as those of the control power to the control power terminals

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

Fuse <4

for

Power

Supply

Fuse <4

for

Power

Supply

Fuse <4

for

Power

Supply

<9, 10

<12

<5, 11

<9, 10

CB2

MC2

MC1

MC3

CB3