12
3.4 Main Circuit
3.4.1 Explanation of main circuit terminals
Symbol
Terminal Name
Description
R, S, T*
AC power input
Connect to the commercial power supply.
U, V, W
Inverter output
Connect a three-phase squirrel-cage motor.
N <->
DC voltage
common
DC voltage common terminal. Not isolated from the power
supply and inverter output.
P <+>, P1
Power factor
improving DC
reactor connection
Remove the jumper from across terminals P <+> -P1 and
connect the optional power factor improving DC reactor (FR-
BEL).
Earth (Ground)
For grounding the inverter chassis.
Must be earthed.
* R, S, <L
1
, N> terminals for single-phase power input.
CAUTION
< > Terminal names in parentheses are those of the EC version.
3.5 Control Circuit
3.5.1 Explanation of control circuit terminals
Symbol
Terminal Name
Description
STF
Forward rotation
start
Turn on the STF signal
to start forward rotation
and turn it off to stop.
A stop command is given if STF
and STR signal turn ON at the
STR
Reverse rotation
start
Turn on the STF signal
to start reverse rotation
and turn it off to stop.
same time.
Cont
ac
t i
nput
RH
RM
RL
Multi-speed
selection
You can select multiple speeds by
shorting any of terminals RH, RM
and RL signal.
The priorities of the speed
commands are in order of jog,
multi-speed setting (RH, RM, RL,
REX) and AU.
The terminal function
changes with the
setting of input
terminal function
selection (Pr. 60 to
Pr. 63). (*4)
SD
(*1)
Contact input
common (sink)
Common terminal for contact inputs (terminals STF, STR,
RH, RM, RL) and indicator connection (terminal FM).
Isolated from terminals 5 and SE.
PC
(*1)
External transistor
common
24VDC power
supply
Contact input
common (source)
When connecting the transistor output (open collector
output) of a programmable controller (PLC) etc., connect
the positive external power supply for transistor output to
this terminal to prevent a malfunction due to leakage
current. It can be used as a 24V 0.1A DC power supply
across PC-SD terminals. Acts as the common terminal of
the contact input signals when source logic is selected.
10
Frequency setting
power supply
5VDC, permissible load current 10mA.
2
Frequency
setting
(Voltage signal)
Inputting 0 to 5VDC (0 to 10V) provides the maximum
output frequency at 5V (10V) and makes input and output
proportional.
Use Pr. 73 "0 to 5V, 0 to 10V selection" to switch between
5V and 10V.
Input resistance 10k
Ω
. Maximum permissible input voltage
20V.
Input
s
ignal
s
Fr
eque
nc
y s
e
tt
ing
4
Frequency
setting
(Current signal)
Input 4 to 20mA DC. Factory-adjusted to be 0Hz at 4mA
and 60Hz <50Hz for EC version> at 20mA. Maximum
permissible input current 30mA. Input resistance
approximately. 250
Ω
.
Turn ON signal AU for current input.
Use any of Pr. 60 to Pr. 63 (input terminal function
selection) to set the AU signal.
