ECO REFERENCE MANUAL
13-13
•
I
2
t motor protection
0 - 7
[1]
Selects the most appropriate curve for the
motor de-rating at low frequencies due to
the reduced cooling effect of the shaft
mounted cooling fan.
I
N
= Nominal motor current (P083)
F
N
= Nominal motor frequency (P081)
P074 =
1/5
P074 =
3/7
P074 =
2/6
P074 =
0/4
100%
50%
50%
100%
150%
I
N
= Nominal motor current (P083)
F
N
= Nominal motor frequency (P081)
0 = No de-rating. Suitable for motors with
separately powered cooling or no fan
cooling which dissipate the same
amount of heat regardless of speed.
1 = For 2 or 4-pole motors which generally
have better cooling due to their higher
speeds. The inverter assumes that the
motor can dissipate full power at
•
50%
nominal frequency.
2 = Suitable for special motors not
continuously rated at nominal current at
nominal frequency..
3 = For 6 or 8-pole motors. The inverter
assumes that the motor can dissipate
full power at
•
nominal frequency.
4 = As P074 = 0 but the inverter trips
(F074) instead of reducing the motor
torque / speed.
5 = As P074 = 1 but the inverter trips
(F074) instead of reducing the motor
torque / speed.
6 = As P074 = 2 but the inverter trips
(F074) instead of reducing the motor
torque / speed.
7 = As P074 = 3 but the inverter trips
(F074) instead of reducing the motor
torque / speed.