5.4 Details of Function Codes
5-233
Chapter 5 Function Code
Details of
Function Codes
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J68 to J99
d27 to d28
U codes
y codes
J97 to J99
d27, d28
Servo Lock (Gain, Completion Timer, Completion Width)
Servo Lock (Gain Switching Time, Gain 2)
Servo-lock
Servo-lock function controls the motor position and keeps the position even when external power is applied.
While the inverter is servo-locked, the inverter output becomes low frequency. Therefore, use the
inverter under the following specified thermal restriction: Output current within the range of 150% o
the rated current for 3 seconds and 80% for continuous operation. (Note that under the restriction,
the inverter automatically limits the carrier frequency under 5 kHz.)
Servo-lock starting conditions
Table 5.4-159
Servo-lock activation condition (servo-lock control starts when the following conditions are met)
F38 = 0 (Use detected speed as a decision
criteria)
F38 = 1 (Use reference speed as a decision
criteria)
1
Run command OFF, or Set frequency < Stop frequency (F25)
2
Servo-lock command
LOCK is ON
(Assignment of servo lock command
LOCK (Function code data = 47))
3
The detected speed is equal to or less than
the stop frequency (F25).
The reference speed is equal to or less than
the stop frequency (F25).
Operation examples
Fig. 5.4-117 Typical Control Sequence of Servo-lock
When the servo-lock command is ON, the inverter keeps on outputting voltage on output terminals [U], [V]
and [W] even if a run command is OFF and the motor seems to stop.
Electric shock may occur.
Specifying servo-lock control
Assignment of Positioning completion signal PSET (Function code data = 82), Servo-lock (Completion
timer) (J98), and Servo-lock (Completion range) (J99)
This output signal comes ON when the inverter has been servo-locked so that the motor is held within the
positioning completion range specified by J99 for the period specified by J98.
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