Lenze 8400 Manuel d'utilisateur télécharger pdf (Page 67)

Technical data

Current characteristics

 67

EDS84ASC552 EN 9.1

4.3 Current characteristics

The controller limits its maximally possible motor current under the following operating

conditions (”current derating”):

ƒ If the maximum heatsink temperature is exceeded

– In this case, the controller switches independently from switching frequency mode

of 16 kHz to 8 kHz and from 8 kHz to 4 kHz (but not from 4 kHz to 2 kHz). This

function can be deactivated via C00144.

When the heatsink temperature continues to rise, the inverter output will be

inhibited and the error message ”Trip” occurs. This also occurs when the switching

frequency reduction is deactivated.

ƒ In case of output frequencies f

out

<|5Hz|

ƒ As a function of the switching frequency modes ”fixed” or ”variable”

0055

f [Hz]

out

f [Hz]

out

OUT

aM02

aM04

aM08

aM016

aM0v

aM2

aM4

aM8

aM16

aMv

8400GG084

Fig. 4-1 Current derating characteristics

 Derating curve depending on the fixed switching frequency

 Derating curve depending on the variable switching frequency

out

Output current

Maximum output current (overload current)

aMx

Maximum output current (overload current) at different switching frequencies: 2kHz,

4kHz, 8kHz and 16kHz

aM0x

Maximum output current (overload current) at f

out

= 0Hz and different switching

frequencies: 2kHz, 4kHz, 8kHz, 16kHz

aMv

Maximum output current (overload current) at a variable switching frequency

aM0v

Maximum output current (overload current) at f

out

= 0Hz and a variable switching

frequency

out

Field frequency at the output U, V, W

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 303 304

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Lenze 8400 Manuel d'utilisateur Page 67

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