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Using the second motor
1.11 Using the second motor
1.11.1 Wiring diagram (second motor)
1.11.2 Second motor setting parameters
z Turn on/off the RT signal to switch between the first and second motors using contacts information of the
magnetic contactor (MC).
(Use the RT signal after setting it to any of the DI1 to DI4 signals using Pr. 180 to Pr. 183, Pr. 187 (input terminal
function selection).
z Select V/F control for the Pr. 451 setting. Vector control with encoder can not be selected.
z By setting values other than "9999" in Pr. 451 when Pr. 450 = "9999" (factory setting), the control system of the first
motor can be changed by switching the RT terminal on and off.
(In this case, turning the RT signal on makes the second function of Pr. 44, Pr. 45, Pr. 452, and Pr. 830 to Pr. 837 valid.)
Param
eter
Name
Factory
Setting
Setting Range
0 Mitsubishi standard motor (SF-JR)
Inverter internal
constant
10
Mitsubishi constant torque motor
(SF-HRCA)
Inverter internal
constant Refer to
450 Second applied motor 9999
30
SF-V5RU dedicated motor
(includes SF-VR type motor)
Inverter internal
constant
page 111.
9999
Function invalid
Pr. 71 "applied motor" is made valid.
451
Second motor control
method selection
9999
20 V/F control Speed control
9999
Function invalid
The setting is the same as that of control system of Pr. 800 "control
system selection". (*)
452
Second electronic
thermal O/L relay
9999
Set the rated motor current.
0 to 500A (Refer to page 80.)
9999 Function invalid
453
Second motor
capacity
Inverter
capacity
Set the motor capacity.
0.4 to 55kW
Setting can
be made
when
Pr. 450
"9999"
454
Number of second
motor poles
4
Set the number of motor poles.
2, 4, 6P
CAUTION
* Even when the first motor is under vector control, the second motor is V/F controlled while the RT
signal is on independently of the Pr. 451 setting when Pr. 450 "9999".
CAUTION
1. Provide interlocks to prevent the MC1 and MC2
from being turned on simultaneously.
2. For the second motor (motor without encoder),
use Pr. 452 "second electronic thermal O/L relay"
or provide an external thermal relay.
3. *: Give one external thermal relay signal to across
OH-SD.
Related parameters
Second electronic thermal relay function setting ⇒ (Pr. 452 "second
electronic thermal O/L relay" (Refer to page 80.))
Inverter
Motor without encode
r
(Second motor)
MC2
MC1
V
W
OH
SD
PA
PAR
PB
PBR
PZ
PZR
PG
SD
U
IM
*
U
V
W
E
IM
U
V
W
E
Encoder
Mitsubihi dedicated motor
(SF-V5RU) (First motor)
Thermal
protector
G1
G2
A
B
C
D
G
S
R
F
N