LG C Series - Manual (Page 84)

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
ƒ In this setting, motor begins to accelerate after dwell operation is executed for dwell time at the
dwell frequency.
ƒ 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
P rpm
f f
r s
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
Hz f
s
2
120
4 1740
60
= ⎟
⎠
⎞
⎜
⎝
⎛ ×
− =
Frequency
Run
command
Dwell time
Dwell freq.
Start freq.
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