Santerno Sinus M, User Manual

Page: 109 / 219

10-9
10.5 Dwell operation
Group Display Parameter Name Setting Range Default Unit
Function
group 2
H7 [Dwell frequency] -
0.1 ~ 400 5.00
Hz
H8 [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 brakes in elevators and cranes.

Dwell frequency: This function is used to generate an output torque in an intended direction. It is useful
in hoisting applications to get enough torque before releasing a mechanical brake.

Dwell frequency shall be set greater than Rated Slip frequency of the motor. Rated slip frequency is
calculated by the formula shown below.






×
− =
120
P rpm
f f
r s
Where,
s
f
= Rated slip frequency
r
f
= Rated frequency
rpm
= Motor nameplate 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.