0
α1
α2
α3
100
f2 f3 fb
O
utput frequency
f0(Hz)
fb = Base frequency
Actual operation level
1st Motor Electronic Thermal Level (F11)
However, fb = 60 Hz
if the base frequency is 60 Hz or higher.
(%)
• The following shows each factor that is set according to the motor characteristics selected by
motor capacity and motor type (induction motor/PM motor).
(Induction motor (IM))
Motor ca-
pacity
Thermal
time con-
stant t (fac-
tory default)
Thermal time con-
stant setting refer-
ence current value
Imax
Characterization factor
switching frequency
Characterization fac-
tor
f
2
f
3
α1 α2 α3
0.4, 0.75 kw
5 min
Continuous allowa-
ble current value ×
150%
5 Hz
7 Hz
75% 85% 100%
1.5 to 3.7 kW 85% 85% 100%
5.5 to 11 kW 6 Hz 90% 95% 100%
15 kw 7 Hz 85% 85% 100%
18.5, 22 kW 5 Hz 92%
100
%
100%
30 to 45 kW
10 min
Base fre-
quency ×
33%
Base fre-
quency ×
83%
54% 85% 95%
55 to 90 kW 51% 95% 95%
110 kw min. 53% 85% 90%
(Synchronous motor (PM))
Motor ca-
pacity
Thermal
time con-
stant t (fac-
tory default)
Thermal time con-
stant setting refer-
ence current value
Imax
Characterization factor
switching frequency
Characterization fac-
tor
f
2
f
3
α1 α2 α3
0.2 to 22 kW 5 min
Continuous allowa-
ble current value ×
150%
Base fre-
quency ×
33%
Base fre-
quency ×
33%
69% 90% 90%
30 to 45 kW
10 min
Base fre-
quency ×
83%
54% 85% 95%
55 to 90 kW 51% 95% 95%
110 kw min. 53% 85% 90%
When Motor Electronic Thermal Characteristic Selection (F10/A06) = 2: For
an inverter-driven motor non-ventilated motor or motor with separately
powered cooling fan
• The operation level is a constant value without decrease that is set at Motor Electronic Thermal
Level (F11/A07) as there is no drop in the cooling effectiveness by output frequency
.
5 Basic Settings
5-22
M1 Series Standard Type User's Manual (I669)
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