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100 Digitax HD M75X Series Installation and Technical Guide
Issue Number: 5
Typical short term overload limits
The maximum percentage overload limit changes depending on the selected motor. Variations in motor rated current, motor power factor and motor
leakage inductance all result in changes in the maximum possible overload. The exact value for a specific motor can be calculated using the
equations detailed in Menu 4 in the relevant Digitax HD M75X Parameter Reference Guide.
Typical values are shown in the table below for RFC-A, RFC-S and open loop (OL) modes:
Generally the drive rated current is higher than the matching motor rated current allowing a higher level of overload than the default setting. The time
allowed in the overload region is proportionally reduced at very low output frequency on some drive ratings.
The maximum overload level which can be attained is independent of the speed.
Drives are rated up to 55
°
C
(131 °F)
.
55
°
C
(131 °F)
ratings are available from the supplier of the drive.
Table 6-3 Open loop and RFC-A maximum permissible continuous output current @ 40 °C (104 °F) ambient
RFC from cold RFC from 100 % Open Loop from cold Open Loop from 100 %
Heavy duty overload with motor rated
current = drive rated current
300 % for 8 s or
200 % for 60 s
300 % for 0.25 s or
200 % for 4 s
150 % for 100 s 150 % for 8 s
Model
Heavy Duty
Nominal rating
Maximum permissible continuous output current (A) allowing for 175 % overload for
4.5 s
kW hp 2 kHz 3 kHz 4 kHz 6 kHz 8 kHz 12 kHz 16 kHz
200 V
01200022 0.37 0.5 2.2 2.2 2.2
01200040 0.75 1.0 4.0 4.0 4.0
01200065 1.1 1.5 6.5 6.5 6.5
02200090 2.2 2.0 9.0 9.0 9.0
02200120 2.2 3.0 12.0 12.0 12.0
03200160 4.0 5.0 16.0 16.0 16.0
400 V
01400015 0.37 0.75 1.5 1.5 1.5
01400030 0.75 1.5 3.0 3.0 3.0
01400042 1.5 2.0 4.2 4.2 3.5
02400060 2.2 3.0 6.0 6.0 6.0
02400080 3.0 5.0 8.0 8.0 7.4
02400105 4.0 5.0 10.5 9.1 7.4
03400135 5.5 7.5 13.5 13.1 10.9
03400160 5.5 10.0 16.0 13.1 10.9
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