Hitachi SJ7002 Series Instruction Manual page 198

Speed Servo ON
Opt. Code
[SON]
Symbol
Valid for
[1] to [8]
Inputs
Required
Settings
Default
Requires
config.
terminal
Current Forcing
Opt. Code
[FOC]
Symbol
Valid for
[1] to [8]
Inputs
Required
A044, A244
Settings
Default
Requires
config.
terminal
Current forcing [FOC]
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The servo-ON function allows you to set the inverter in a speed-servo-lock state with an
intelligent input during operation. This function is available when A044=05 vector control with
54
sensor for the characteristic V/f curve.
To use the servo-ON function, assign option code 54 to an intelligent input. After making the
input assignment, the inverter will accept an operation command only when the [SON] terminal
is ON.
If the [SON] terminal is turned OFF during inverter operation, the inverter output enters FRS
mode (free-run stop). If the [SON] is turned ON again, the inverter restarts the motor according
A044
to function B088, Restart Mode After FRS.
The inverter does not allow [SON] terminal assignment and [FOC] (forcing function) assign-
ment at the same time. If both are assigned, the [FOC] has priority (operates normally) and the
[SON] function is not available.
Speed-servo lock states
Output
frequency
0
Servo-ON [SON]
FW/RV
The current forcing function applies an excitation current to pre-build magnetic flux in the
motor. The forcing function is available when one of the following vector control modes is
55
configured for use at the inverter output:
• A044 = 03 sensorless vector control
• A044 = 04 0Hz-range sensorless vector control
• A044 = 05 vector control with sensor
To use current forcing, assign option code 55 to an intelligent input terminal. After making the
input assignment, the inverter will accept an operation command only when the [FOC] terminal
is ON.
If the [FOC] terminal is turned OFF during inverter operation, the inverter output enters FRS
mode (free-run stop). If the [FOC] is turned ON again, the inverter restarts the motor according
to function B088, Restart Mode After FRS.
Output
frequency
0
FW/RV
Inverter does not follow FW/RV
command because [SON] is OFF
Excitation current flows
Inverter does not follow FW/RV
command because [FOC] is OFF
SJ700
Free-run stop Restart after FRS (B088)
Free-run stop Restart after FRS (B088)
4–37
Inverter
2
t
t