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ENCODER FEEDBACK CONTROL—A500(L)
4.9 Additional Functions
(1) Pr. 162 "selection of automatic restart after instantaneous power failure selection". (factory
setting: 0)
By setting "2" in Pr. 162, automatic restart after instantaneous power failure can be made at the
frequency detected from the encoder. In the vector control mode, automatic restart is made with the
encoder detection frequency searched for, independently of the Pr. 162 setting.
(2) Pr. 285 "overspeed detection frequency"/"excessive speed deviation detection frequency"
(factory setting: 9999)
!
When "0" is set in Pr. 370, Pr. 285 acts as an overspeed detection frequency. (Overspeed detection
function)
If (detection frequency (speed)) - (output frequency (speed)) > (Pr. 285 setting), E.MB1 occurs and
the output is shut off.
When Pr. 285 = 9999, overspeed detection is not performed.
!
When "1" or "2" is set in Pr. 370, Pr. 285 acts as a excessive speed deviation detection frequency.
(Speed deviation excess detection function)
Excessive speed deviation detection frequency is a parameter available with an upgraded inverter.
This parameter acts only as an over speed detection frequency for a standard inverter. Refer to the
inverter manual for the availability of the excessive speed deviation detection frequency.
If ((actual speed) - (speed command value)) > (Pr. 285 setting), E.OSD occurs and the output is shut off.
Pr. 162 Setting
Description
0 (factory setting)
With frequency search
1
Without frequency search
2
Encoder detection frequency search