Zero-Servo Function - Omron SYSDRIVE RV Series User Manual

Zero-servo Function

The zero-servo function holds the motor when the motor is stopped in what is call a zero-servo status. This
function can be used to stop the motor even with an external force acts on the motor or the analog reference
input is offset.
The zero-servo function is enabled when one of the multi-function inputs (H1-01 to H1-06) is set to 72 (zero-
servo command). If the zero-servo command is ON when the frequency (speed) reference falls below the zero-
speed level, a zero-servo status is implemented.
Related Parameters
Name
Param-
eter
Display
Number
Zero-speed Used to set the frequency
level (DC which starts DC injection
injection braking in units of Hz when
braking deceleration to stop is
starting fre- selected.
quency) When b2-01 is less than E1-
b2-01 09, E1-09 is used to set the
starting frequency for the
DC injection braking.
DCInj Start
In flux vector control, b2-01
Freq
is used to set the starting fre-
quency for the zero-speed
control.
Adjust the strength of the
zero-servo lock.
Enabled when the "zero-
Zero-servo
servo command" is set for
gain
the multi-function input.
When the zero-servo com-
mand has been input and the
frequency reference drop
b9-01
below excitation level (b2-
01), a position control loop
is created and the motor
stops. Increasing the zero-
Zero Servo
servo gain in turn increases
Gain
the strength of the lock.
Increasing it by too much
will cause oscillation.
Setting
Description
Range
0.0 to
10.0
0 to
100
Control Methods
Change
Factory during
V/f Open
Setting Opera-
V/f with Loop
tion
PG Vector
0.5 Hz No A A
5 No No No No
Individual Functions
Regis-
Flux
ter
Vec-
tor
A A 189H
A 1DAH
179
6-