High Slip Braking (Hsb) - Omron VARISPEED F7 User Manual

Adjusting the Kinetic Energy Buffering Deceleration Time (C1-09)
The fast stop time set in parameter C1-09 is used to decelerate to stop when a Kinetic Energy Buffering com-
mand is input.
To set up this parameter do the following:
Increase C1-09 until a UV1 fault is detected during deceleration. (If L2-01 is set to 2, no UV1 will be
•
detected, but the motor will start to coast when the DC bus voltage drops too much.) The highest setting
value of C1-09, at which no UV1 is detected will be the maximum deceleration time.
Decrease C1-09 until a DC bus overvoltage (OV) is detected. The lowest setting value of C1-09, at which
•
no OV is detected, will be the minimal deceleration time.
Set a value for C1-09, that is somewhere in the middle between the maximum and the minimum decelera-
•
tion time.
Adjusting the Frequency Reduction Gain at Kinetic Energy Buffering Start (L2-08)
When the Kinetic Energy Buffering function is enabled, the output frequency is reduced for a certain fre-
quency amount in order to prevent an UV1 fault. The amount of this frequency step can be set using parameter
L2-08. It is set in percent of the slip frequency before the Kinetic Energy Buffering signal was input. Normally
there is no need to change this setting.
Increase the setting if an undervoltage fault occurs right after Kinetic Energy Buffering start.
•
Decrease the setting if an overvoltage fault occurs right after Kinetic Energy Buffering start.
•
Multifunction Input Settings: H1-01 to H1-05 (Terminal S3-S7)
Kinetic Energy Buffering Command NC: "65"
Storing this setting for one of the parameters H1-01 to H1-05, the Kinetic Energy Buffering function can
•
6
be activated using a NC contact.
Kinetic Energy Buffering Command NO: "66"
Using this setting for one of the parameters H1-01 to H1-05, the Kinetic Energy Buffering function can be
•
activated using a NO contact.

High Slip Braking (HSB)

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 (braking resistor, braking resistor unit).
The function must be activated by a multifunction input. It 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.
132
6-