Omron Varispeed E7 User Manual

Individual Functions
6-109
 High Slip Braking
The High Slip Braking function can shorten the deceleration times without using a braking option for emer-
gency stops for example.
The function must be activated by a multifunction digital input.
Note the following:
• The HSB function is not comparable with the normal deceleration function. It does not use a ramp func-
tion.
• HSB should not be used at normal operation instead of a deceleration ramp.
Related Parameters
Adjusting the HSB Deceleration Frequency Width (N3-01)
This parameter sets the step value (in percent of maximum output frequency) that is used for lowering the out-
put 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 parameter N3-02 limits the output current while high slip braking is active. The current limit
affects the achievable deceleration time. The parameter is set in percent of the motor rated current setting.
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 relay will operate.
Activating High Slip Braking
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. As the HSB function is activated by the pos-
itive edge of digital input signal HSB cannot be stopped, i.e. normal inverter operation cannot be resumed.
Parameter
Number
Name
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
n3-01 High Slip braking deceleration frequency width 1 to 20 5% No A
n3-02 High Slip braking current limit
100 to
200
150% No A
n3-03 High Slip braking stop dwell time
0.0 to
10.0
1.0 sec. No A
n3-04 High Slip braking OL7 time
30 to
1200
40 sec. No A

Omron Varispeed E7 Specifications

General

Brand	Omron
Model	Varispeed E7
Category	Inverter
Language	English