5.3 Description of Function Codes
5-240
■ Start after synchronization mode
In Start after synchronization mode (d41 = 3), the inverter controls the follower motor to synchronize its Z phase
with the master motor’s Z phase, based on the first detected Z phases (positions) of those two motors after the
start of master-follower operation. The follower motor could cause a single cycle delay at a maximum (on standby)
at the start of operation.
Once the follower motor starts running after standby, it will never go standby unless the master-follower operation
is cancelled (see Note 1 below).
The Z phase synchronization angles of the master and follower motors can be adjusted with d76.
The inverter integrates the position pulses for each of the master and follower motors and controls the follower
motor’s rotation speed and position to keep the deviation between those two motors at zero.
If any incorrect count due to electrical noise or other factors is found in the integrated count of A/B phases, the
inverter corrects the error based on the Z phase difference.
If the deviation between those two motors falls below the synchronization completion detection angle (specified by
d77), the inverter issues an “SY” synchronization completion signal. If synchronization is lost so that the position
error exceeds 10 times of the excessive error setting (specified by d78), the inverter shuts down its output with the
ero
alarm.
Figure 5.3-24
Note 1: Master-follower operation cancellation conditions
In any of the following cases, the master-follower operation is canceled.
• The run command for the follower motor is turned OFF.
• Terminal command “BX” (“Coast to a stop”) or “STOP” (“Force to stop”) is turned ON.
• Any alarm occurs.
• The inverter switches to a single motor drive. (Assign terminal command “Hz2/Hz1” and switch the frequency
setting source with F01/C30.)
• Under torque control or when the inverter is driven by commercial power.
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