M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
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Parameters<br />
Braking, continued<br />
PNU ID<br />
Access<br />
RUN Value/Range Description<br />
P12.5 504 X — Brake chopper 0<br />
0 Brake-chopper deactivated<br />
1 Automatic activation in operation (RUN)<br />
2 Automatic activation in operation (RUN) and upon stop (STOP)<br />
P12.6 1447 X — Brake chopper, DC bus switching threshold 765<br />
0–870V This function is only active with the three-phase frequency<br />
inverters MMX34…3D3_ (3.3A) to MMX34…014_ (14A)<br />
The switching threshold for the brake transistor should always<br />
be above the maximum DC link voltage<br />
For example, allowing for the maximum permissible input<br />
voltage peak of 10%:<br />
ULN = 400 Vac<br />
ULN +10% = 400 Vac = 440 Vac<br />
UDC = 1.35 x ULNmax = 1.35 x 440V = 594 Vdc (maximum<br />
permissible DC link voltage in motor operation)<br />
Allowing for an energy absorption from the DC link of around<br />
30% during braking, the on threshold here for the braking<br />
transistor should be set to around 780V<br />
Note: Lower values for the on threshold will switch on the<br />
braking resistor earlier so that it is subject to a greater load<br />
The DC link voltage is shown at M1.8. In practice, the value of<br />
the DC link voltage is around 565V at ULN = 400V<br />
114 M-Max <strong>Series</strong> <strong>Adjustable</strong> <strong>Frequency</strong> <strong>Drive</strong> MN04020003E—April 2011 www.eaton.com<br />
Factory Setting<br />
(P1.3)
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