Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual User Manual

Page 43

4-5

Wiring

Figure 4.2
Typical Connection of AC Input Power Wiring for Two Paralleled Units of
Model 8720MC-RPS027 and 8720MC-RPS065

1AUX

2AUX

3AUX

PR1

PR2

PR3

MC1

MC2

8720MC-RPS

Regenerative Power

Supply Unit 2

(Slave Unit)

8720MC-RPS

Regenerative Power

Supply Unit 1

(Master Unit)

1AUX

2AUX

3AUX

PR1

PR2

PR3

MC1

MC2

PWR

24V

MC1

CB2

MC2

RUN On/Off

MC2

MC1

MC2

MC1

Reactor

(L1)

Main

Magnetic

Contactor

(MC1)

Harmonic

Filter

Circuit

Breaker <4

(CB1)

Circuit

Breaker <4

(CB2)

Line Filter <6

for AC

Input

Power

Line Filter <6

for AC

Input

Power

Single-phase
Line Filter <6

Main

Magnetic

Contactor

(MC2) Reactor

(L2)

Harmonic

Filter

Protection
Fuse <2

Terminals
P and N
of Load
Equipment

380 to
460 VAC

100 to

115 VAC

200 to

230 VAC

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 L

3AUX

. The phases of the control power L

1AUX

, L

2AUX

and L

3AUX

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 and SW7-2 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

Fuse <4

for

Power

Supply

Fuse <4

for

Power

Supply

<9, 10

<5, 11

<12