6 Parameter Setting and Functions
6.2.4 Fully Closed Control
6-12
6.2.4 Fully Closed Control
A fully closed loop can be formed using the parameter settings on the SGDH SERVOPACK.
In previous SERVOPACKs, a semi-closed method was used to control the motor, but with
this function even more precise control is achieved because control involves the detection of
the position and speed of actual machine operation.
Parameters must be set when using fully closed control. Refer to
6.2.6 Parameter Settings
for details.
6.2.5 Fully Closed System Specifications
This section describes the fully closed system specifications of the SGDH SERVOPACK
when an NS115 is mounted.
Fully Closed Encoder Pulse Output Form
5-V Differential line driver output (complies with EIA Standard RS-422A)
Fully Closed Encoder Pulse Signal Form
90
°
Phase difference 2-phase differential pulse: phase A, phase B
Maximum receivable frequency for SERVOPACK: 1 Mbps
Controlled machine
Servomotor
Mechanism in-
cluding back-
lash and friction
Speed and
position at the
machine end
Load torque
Torque
Power
Speed,
position
Detection
current
Current
Fully closed control
PhaseA
PhaseB
t1, t2, t3, t4
≥
0.2
µ
s
t1
t2
t3
t4
Forward rotation
Reverse rotation
