Mitsubishi FR-A800

Main circuit terminals
INSTALLATION AND WIRING
37
2
2.5 Main circuit terminals
2.5.1 Details on the main circuit terminals
NOTE
• When connecting an optional brake resistor (FR-ABR) or a brake unit (FR-BU2, FR-BU, BU), remove the jumpers across the
terminals PR and PX. For the details, refer to page 71.
Terminal
symbol
Terminal name Terminal function description
Refer to
page
R/L1,
S/L2,
T/L3
AC power input
Connect these terminals to the commercial power supply.
Do not connect anything to these terminals when using the high power
factor converter (FR-HC2) or the power regeneration common converter
(FR-CV).
—
U, V, W Inverter output
Connect these terminals to a three-phase squirrel cage motor or a PM
motor.
—
R1/L11,
S1/L21
Power supply for the control
circuit
Connected to the AC power supply terminals R/L1 and S/L2. To retain the
fault display and fault output, or to use a high power factor converter (FR-
HC2) or a power regeneration common converter (FR-CV), remove the
jumpers across terminals R/L1 and R1/L11 and across S/L2 and S1/L21,
and supply external power to these terminals.
The power capacity necessary when separate power is supplied from R1/
L11 and S1/L21 differs according to the inverter capacity.
FR-A820-00630(11K) or lower, FR-A840-00380(15K) or lower
60 VA
FR-A820-00770(15K) or higher, FR-A840-00470(18.5K) or higher
80 VA
54
P/+, PR
Brake resistor connection
FR-A820-00630(11K) or lower
FR-A840-00380(15K) or lower
Connect an optional brake resistor (FR-ABR) across the terminals P/+ and
PR. Remove the jumper across the terminals PR and PX for the inverter
capacity that has the terminal PX.
Connecting a brake resistor increases the regenerative braking capability.
71
P3, PR
Brake resistor connection
FR-A820-00770(15K) to
01250(22K)
FR-A840-00470(18.5K) to
01800(55K)
Connect an optional brake resistor across the terminals P3 and PR.
Connecting a brake resistor increases the regenerative braking capability.
P/+, N/- Brake unit connection Connect the brake unit (FR-BU2, FR-BU, BU), power regeneration
common converter (FR-CV), power regeneration converter (MT-RC), high
power factor converter (FR-HC2), or DC power supply (under DC feeding
mode).
When connecting multiple inverters, FR-A820-00770(15K) to 01250(22K)
or FR-A840-00470(18.5K) to 01800(55K), in parallel using the FR-CV, FR-
HC2, or a DC power supply, always use either terminal P/+ or P3 for the
connection. (Do not use the terminals P/+ and P3 together.)
73
P3, N/-
Brake unit connection
FR-A820-00770(15K) to
01250(22K)
FR-A840-00470(18.5K) to
01800(55K)
P/+, P1
DC reactor connection
FR-A820-03160(55K) or lower
FR-A840-01800(55K) or lower
Remove the jumper across terminals P/+ and P1, and connect a DC
reactor.
When a DC reactor is not connected, the jumper across terminals P/+ and
P1 should not be removed.
When using a motor with a capacity of 75 kW or higher, always connect a
DC reactor, which is available as an option.
79
DC reactor connection
FR-A820-03800(75K) or higher
FR-A840-02160(75K) or higher
Always connect a DC reactor, which is available as an option.
PR, PX Built-in brake circuit connection
When the jumper is connected across terminals PX and PR (initial status),
the built-in brake circuit is valid.
The built-in brake circuit is equipped in the FR-A820-00490(7.5K) or lower
and FR-A840-00250(7.5K) or lower.
—
Earth (ground)
For earthing (grounding) the inverter chassis. This must be earthed
(grounded).
44