Bosch Rexroth VFC 3210, Руководство по эксплуатации, Страница: 178 / 282

12.10 Protection Functions
12.10.1 Converter Protection
Overload pre-warning
When the frequency converter output current is higher than [C0.29] 'Converter
overload pre-warning level' and lasts for longer than [C0.30] 'Converter overload
pre-warning delay', the 'Converter overload pre-warning' signal will be active on
the selected digital output terminal. The signal will be immediately inactive
when the output current is lower than[C0.29].
The actual overload pre-warning level will be reduced by the output current de-
rating by the equation:
[Actual overload pre-warning level] = [C0.29] x [Derating percentage]
Example: When [C0.29] = 50 %, the derating percentage of the output current at
15 kHz is 51 %, as shown in chapter "Derating and carrier frequency" on page
25 .
●
When the carrier frequency is 4 kHz, the output current is 100 % of the rated
current, the actual overload pre-warning level is 50 % x 100 %, which equals
to the [C0.29].
●
When the carrier frequency is 15 kHz, the output current is derated to 51 % of
the rated current, the actual overload pre-warning level is 50 % x 51 %.
Code Name Setting range Default Min. Attri.
C0.29 Converter overload pre-warning level 20.0...200.0 % 110.0 0.1 Stop
C0.30 Converter overload pre-warning delay 0.0...20.0 s 2.0 0.1 Stop
E2.15 Relay 1 output selection
11: Converter overload
pre-warning
1 – Stop
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Functions and Parameters VFC 3210
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