Chapter 10. Advanced functions
10.5 Dwell operation
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| Set |
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Function |
| H 7 |
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| [Dwell frequency] |
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group 2 |
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| H 8 |
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| [Dwell time] |
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Min/Max
Range
0/400
0/10
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5.0Hz
0.0sec
In this setting, motor begins to accelerate after dwell operation is executed for dwell time at the dwell frequency.
It is mainly used to release mechanical brake in elevators after operating at dwell frequency.
Dwell frequency: This function is used to output torque in an intended direction. It is useful in hoisting applications to get enough torque before releasing a mechanical brake. Rated Slip frequency is calculated by the formula shown below.
s = r − ⎛ rpm ⋅ P ⎞ f f ⎝⎜ 120 ⎠⎟
Where, f s = Rated slip frequency
fr = Rated frequency
rpm = Motor nameplate RPM P = Number of Motor poles
Example
Rated frequency = 60Hz
Rated RPM = 1740rpm
Number of motor poles= 4
⎛ 1740 ⋅ 4 ⎞ |
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f s = 60 − ⎜ |
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120 | ||||
⎝ | ⎠ |
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Dwell freq. |
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Start freq. |
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Frequency | Dwell time |
Run |
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command |
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