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Chapter 10. Advanced functions
10.5 Dwell operation
Group LED Display Parameter Name
Set
value
Min/Max
Range
Factory
Defaults
Unit
H 7 [Dwell frequency] -
0/400 5.0 Hz
Function
group 2
H 8 [Dwell time] -
0/10 0.0 sec
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.
⎟
⎠
⎞
⎜
⎝
⎛
×
−=
120
Prpm
ff
rs
Where, = Rated slip frequency
s
f
= Rated frequency
r
f
= Motor nameplate RPM
rpm
P
= Number of Motor poles
Example
Rated frequency = 60Hz
Rated RPM = 1740rpm
Number of motor poles= 4
Hzf
s
2
120
41740
60 =
⎟
⎠
⎞
⎜
⎝
⎛
×
−=
Frequency
Run
command
Dwell time
Dwell freq.
Start freq.
84