High Slip Braking - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

High Slip Braking

If the load inertia is large the high slip braking function can be used to shorten the deceleration time compared
to the normal deceleration time without using a braking option, e.g. for emergency stops.
The function must be activated by a multifunction input.
Note: • The HSB function is not comparable with the normal deceleration function. It does not use a ramp
function.
• HSB should not be used at normal operation instead of a deceleration ramp.
Related Constants
Constan
Name
Number
High-slip braking deceleration
N3-01
frequency width
N3-02 High-slip braking current limit
N3-03 High-slip braking stop dwell time
N3-04 High-slip braking OL time
Adjusting the HSB Deceleration Frequency Width (N3-01)
This constant sets the step value that is used for lowering the output frequency to achieve a large negative slip
and thereby to brake the motor.
Normally no adjustments should be necessary. Increase the value if DC bus overvoltage faults occur.
Adjusting the HSB Current Limit (N3-02)
The setting of constant N3-02 limits the output current while high slip braking is active. The current limit
affects the achievable deceleration time.
The lower the current limit the longer is the deceleration time.
Setting the HSB Dwell Time at Stop (N3-03)
At the end of a high slip braking the output frequency is held at the minimum output frequency for the time set
in N3-03. Increase the time if the motor coasts after HSB.
Setting the HSB Overload Time (N3-04)
N3-04 sets the HSB overload time. If the output frequency does not change for any reason although an HSB
command is given, an OL7 fault will be displayed and the fault contact will operate.
Multifunction Input Settings: H1-01 to H1-05 (Terminal S3 to S7)
High Slip Braking: "68"
If one of the multifunction inputs is set to "68" it can be used to activate the HSB function. The inverter will
brake the motor immediately after the HSB command was given. HSB cannot be stopped, i.e. normal inverter
operation cannot be resumed.
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Description
Sets the frequency width for deceleration during high-slip
braking in percent, taking the maximum frequency
(E1-04) as 100%.
Sets the current limit for deceleration during high-slip
braking in percent, taking the motor rated current as 100%.
The resulting limit must be 150% of the inverter rated
current or less.
Sets the dwell time of the output frequency for FMIN
(1.5 Hz) .
Effective only during deceleration with high-slip braking.
Sets the OL7 time when the output frequency does not
change for some reason during deceleration with high-slip
braking.
Individual Functions
Change
Setting Factory Access
during
Range Setting Level
Operation
1 to 20 5 % No
100 to
150% No
200
0.0 to
1.0 s No
10.0
30 to
40 s No
1200
A
A
A
A
101
6-