6. SYSTEM PARAMETERS English
Parameter Function Range
[Default]
Description / Notes
© Siemens plc 1999 G85139-H1751-U529-D1
55
4/8/9
P076 ·
Pulse frequency 0 - 7
[0 or 4]
Sets the pulse frequency (from 2 to 16 kHz) and the PWM mode. If silent operation is
not absolutely necessary, the losses in the inverter as well as the RFI emissions can
be reduced by selecting lower pulse frequencies.
0/1 = 16 kHz (230 V default)
2/3 =8 kHz
4/5 = 4 kHz (400 V default)
6/7 =2 kHz
Even numbers = normal modulation technique.
Odd numbers = lower loss modulation technique used when operating mainly
at speeds above 5 Hz.
As a result of the higher losses at higher pulse frequencies than those set in
the factory, the maximum continuous output current is reduced as a function of
the pulse frequency. If values 4, 5, 6 or 7 are selected for P076, then the drive
inverters are not de-rated. The power de-rating is also valid for MMVXXX/3F
with integrated filter. For MIDIMASTER Vector drive converters with 230V from
30kW upwards, 400V from 45kW upwards, and 575V from 22kW upwards,
P076 can only be set to values 4, 5, 6 or 7 (4kHz or 2kHz). The pulse
frequency is automatically reduced if the internal drive inverter monitoring
functions determine an excessive heatsink temperature. The frequency is
automatically increased again when the temperature has returned to a normal
value.
Table to reduce the rated output current for higher
Model % of full load de-rating
pulse frequencies
P076 =0 or 1 P076 =2 or 3
MMV75/3 80 100
MMV110/3 50 80
MMV150/3 50 80
MMV220/3 80 100
MMV300/3 50 80
MMV400/3 50 80
MMV550/3 50 80
MMV750/3 50 80
Model % of full load de-rating
P076 =0 or 1 P076 =2 or 3
MDV550/2 55 90
MDV750/2 64 90
MDV1100/2 55 75
MDV1500/2 47 80
MDV1850/2 43 79
MDV2200/2 38 68
MDV750/3 57 90
MDV1100/3 50 83
MDV1500/3 64 90
MDV1850/3 55 75
MDV2200/3 50 90
MDV3000/3 47 88
MDV3700/3 40 75
MDV550/4 75 100
MDV750/4 55 100
MDV1100/4 39 75
MDV1500/4 64 90
MDV1850/4 55 75
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