Master-follower operation
These function codes specify various parameters required for master-follower operation.
■ Application-Defined Control (d41)
Data for d41 Function
2 Immediate synchronization mode at the start, without Z phase
3 Start after synchronization mode
4 Immediate synchronization mode at the start, with Z phase
The master-follower operation control enables the follower inverter to detect the master motor rotation with PG
signals and synchronize the follower motor with the master motor in rotation speed and position.
The master-follower operation is available in three modes: Immediate synchronization mode at the start, with Z
phase (d41 = 4) and without Z phase (d41 = 2) and Start after synchronization mode (d41 = 3).
PG signals from master motor should be fed to terminals XA, XB, and XZ, and follower motor’s ones, to terminals
YA, YB, and YZ.
Table 5.3-33 Specifications of Master-follower operation
Item Specifications Remarks
Control
Speed control range
under V/f control with speed
sensor
1:100
4-pole motors and PGs with 1024 P/R
Speed reduction ratio = 1:1
During running at constant speed
Speed control range under
vector control with speed
sensor
1:1500
Position control accuracy ±2°
Electrical
requirements
Input pulse rate 10 p/s to 100 kp/s *
Maximum wiring length: 100 m (328 ft) *
When using quadrature encoders
* For PGs with an open collector output, the input pulse rate is 30 kp/s or below and the maximum wiring length is
20 m (66 ft).
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