F
lux comman
d
100%
Magneti
c Flux Le
v
el
(3020Hex-4AHex)
0%
0%
50%
Torque
cur
rent
comman
d
8-9-22
Pre-excitation
The motor generates torque through magnetic flux and torque current. Since the establishment of
magnetic flux has a lag element, sufficient torque is not generated at the time of starting.
Pre-excitation is a function for establishing the magnetic flux before startup to ensure sufficient torque
even during the time of starting.
There are two methods for issuing pre-excitation commands: one is to execute for the period of Pre-
excitation T
imer (3008Hex-56Hex) after the RUN command is turned ON, and the other is to turn ON
the EXITE terminal and apply pre-excitation until the RUN command is input.
Controlling by Pre-excitation Timer
When the pre-excitation (Timer) elapses, it is judged that magnetic flux has been established, and ac-
celeration is started. Secure sufficient time for establishment of magnetic flux with Pre-excitation Timer
(3008Hex-56Hex).
The appropriate value of the pre-excitation (T
imer) is different for each capacity. As a standard, con-
sider it equivalent to the default value of the Power Interruption Restart Wait Time (3008Hex-0EHex).
This function is disabled when the pre-excitation timer is set to 0.00.
Parameter No. Function name Data
Default da-
ta
Unit
3008Hex-56Hex Pre-excitation Timer
0.00: Disable
0.01 to 30.00
0.00 s
3008Hex-55Hex
Pre-excitation Level
*1
100 to 400 100 %
*1. Pre-excitation Level (3008Hex-55Hex) sets the ratio with the rated magnetic flux as 100%. This is used to
raise the output current to more than specified to shorten the pre-excitation timer. Generally
, there is no
need to change the settings. If a set value is too large, instantaneous overcurrent (alarm code: 01) some-
times is generated.
8 Other Functions
8-135
M1 Series EtherCAT Type User’s Manual (I670)
8-9 Other Operation Functions
8
8-9-22 Pre-excitation
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