Chapter 5 Panel Operator
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5.2.4 Automatic Adjustment of the Speed Reference Offset
When using the speed/torque (analog reference) control, the servomotor may rotate slowly even if 0V is
specified as the analog voltage reference.
This happens if the host controller or external circuit has a slight offset (in the unit of mV) in the
reference voltage.
The reference offset automatic adjustment mode automatically measures the offset and adjusts the
reference voltage. It can adjust both speed and torque reference offset.
The servodrive automatically adjusts the offset when the host controller or external circuit has the offset
in the reference voltage.
After completion of the automatic adjustment, the amount of offset is stored in the servodrive. The
amount of offset can be checked in the speed reference offset manual adjustment mode (Fn004). Refer
to
4.5.3
4.5.3
4.5.3
4.5.3 (2)
(2)
(2)
(2) Manual
Manual
Manual
Manual Adjustment
Adjustment
Adjustment
Adjustment of
of
of
of the
the
the
the Speed
Speed
Speed
Speed Reference
Reference
Reference
Reference Offset
Offset
Offset
Offset
....
The automatic adjustment of reference offset (Fn003) cannot be used when a position loop has been
formed with a host controller and the error pulse is changed to zero at the servomotor stop due to
servolock. Use the speed reference offset manual adjustment for a position loop.
The zero-clamp speed control function can be used to force the servomotor to stop while the zero speed
reference is given.
Note:
Note:
Note:
Note:
The speed reference offset must be automatically adjusted with the servo OFF.
Adjust the speed reference offset automatically in the following procedure.
1. Turn OFF the servodrive and input the 0V reference voltage from the host controller or external circuit.
2. Press the MODE key to select the utility function mode.
3. Press the INC or DEC key to select the utility function number Fn003.
4. Press the ENTER key to enter into the speed reference offset automatic adjustment mode.
Reference Voltage
Offset
Speed Reference
Reference Voltage
Reference Voltage
Reference Voltage
Reference Voltage
Speed Reference
Speed Reference
Speed Reference
Speed Reference
Offset automatically
Offset automatically
Offset automatically
Offset automatically
adjusted in servodrive
adjusted in servodrive
adjusted in servodrive
adjusted in servodrive ....
Automatic offset adjustment
Automatic offset adjustment
Automatic offset adjustment
Automatic offset adjustment
Se r vomot or
Se r vomot or
Se r vomot or
Se r vomot or
Slow r ot at ion
Slow r ot at ion
Slow r ot at ion
Slow r ot at ion
（
S ervo O N
S ervo O N
S ervo O N
S ervo O N
）
Servo O FF
Servo O FF
Servo O FF
Servo O FF
0
0
0
0V Speed
V Speed
V Speed
V Speed
Reference
Reference
Reference
Reference
H ost
H ost
H ost
H ost
Cont r olle r
Cont r olle r
Cont r olle r
Cont r olle r
Servodrive
Servodrive
Servodrive
Servodrive
