Overcurrent Protection
PM motors must set with an allowable current value for preventing the permanent magnet from be-
coming demagnetized. If a current exceeding this allowable current value is allowed to pass, the mag-
netic force of the permanent magnet weakens and the desired motor characteristics can no longer be
obtained.
When a current of current value set in 1st PM Motor Overcurrent Protection Level (P90) or higher
flows, overcurrent protection alarms OC1, OC2 or OC3 are output to protect the motor.
Parameter No. Function name Data
Default
data
Unit
P90
1st PM Motor Overcurrent Protec-
tion Level
0.00 to 4000 A
(0.00: No active)
50.00 A
High-efficiency Control
In the operation of PM motors, motor parameters are used to perform high-efficiency control. Opera-
tion of a PM motor with the motor parameters unknown or in a state where rotation tuning cannot be
performed is sometimes possible by disabling high-efficiency control.
To disable high-ef
ficiency control, set PM Motor High-efficiency Control Selection (d89) to 0.
Parameter No. Function name Data
Default
data
Unit
d89
PM Motor High-efficiency Control
Selection
0: Disable
1: Enable
1 -
Magnetic Position Detection Completed Signal (PTD)
The ON signal is output when the magnetic pole position is detected at PM motor startup. This param-
eter is enabled when P30 is set to other than 0.
Parameter No. Function name Data
Default
data
Unit
E20, E21, E27
Output Terminal [DO1] Function
Selection, Output Terminal [DO2]
Function Selection, Output Termi-
nal [ROA, ROB] Function Selec-
tion
89: PTD (magnetic position detec-
tion completed signal)
-
-
Synchronous Motor Magnetic Pole Position Pull-in Frequency
When using an encoder having A, B and Z phase outputs in PM Vector control with speed and pole
position sensor, pull-in operation at the magnetic pole position is performed at the frequency set at d80
during the period up to detection of the Z phase immediately after power is turned ON as the magnetic
pole position is unknown. After detection of the Z phase, the magnetic pole position referenced to the
magnetic pole position sensor offset set to P95 is established, and regular operation is switched to.
Generally, there is no need for adjustment.
6 Vector Control and Applied Functions
6-24
M1 Series Standard Type User's Manual (I669)
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