Parameter Descriptions 7-41
H7 Dwell Frequency
Range: 0.1-400 [Hz]
Default: 5.00
Access Configurable
See also: P35, P36, H8
When run frequency is issued, the motor will accelerate after the Dwell
Frequency is applied for the Dwell Time – H8. Dwell frequency can be set
within Frequency High and Low Limits (P35 and P36).
Dwell frequency is used to output torque in an intended direction. It is
useful in hoisting applications to apply torque before releasing a mechanical
brake. Rated slip frequency is calculated by the formula shown below:
Where, = Rated slip frequency
= Rated frequency = = Motor nameplate RPM
= Number of Motor poles
Example:
Rated frequency = 60Hz; Rated RPM = 1740rpm;
Number of motor poles= 4
H8 Dwell Time
Range: 0-10 [sec]
Default: 0.0
Access Configurable
See also: H7
Sets the time for dwell operation.
⎟
⎠
⎞
⎜
⎝
⎛
×
−=
120
Prpm
ff
rs
H
f
s
2
120
41740
60 =
⎟
⎠
⎞
⎜
⎝
⎛
×
−=
Frequency
Run
command
Dwell time
Dwell freq.
Start freq.
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