5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual 241
◆ n3: High Slip Braking (HSB) and Overexcitation Braking
■ High Slip Braking (V/f)
HSB works in V/f Control only and is used to decrease the stopping time compared to normal deceleration without using
braking resistor options. HSB stops the motor by reducing the output frequency in large steps, thus producing a high slip.
Regenerative energy created from decelerating the load is dissipated in the motor windings through increased motor slip.
Because of the increased temperature of the motor windings, HSB should not be used for frequently stopping the motor.
Notes on using High Slip Braking:
• The deceleration time that has been set is ignored during HSB. Use Overexcitation Deceleration 1 (L3-04 = 4) or a
dynamic braking options if the motor has to be stopped in a defined time.
• Braking time varies based on the load inertia and motor characteristics.
• HSB and KEB Ride-Thru cannot be used simultaneously. If enabled at the same time, an oPE03 will occur.
• HSB must be triggered by a digital input set to H1- = 68. Once the HSB command is given, it is not possible to
restart the drive until the motor has stopped completely and the Run command is cycled.
• Use parameters n3-01 through n3-04 for adjusting HSB.
■
n3-01: High Slip Braking Deceleration Frequency Width
Sets the step width for frequency reduction during HSB. Increase n3-01 if DC bus overvoltage (ov) occurs during HSB.
■
n3-02: High Slip Braking Current Limit
Sets the maximum current to be output during an HSB stop as a percentage of motor rated current (E2-01). Reducing the
current limit increases the deceleration time. Make sure that this value does not exceed the drive’s current rating.
• Lower this setting if overvoltage occurs during HSB.
• Lower this setting if motor current is too high during HSB. High current can damage the motor due to overheat.
• The default setting is 120%.
■
n3-03: High Slip Braking Dwell Time at Stop
When the motor reaches a relatively low speed at the end of HSB, the output frequency is kept at the minimum output
frequency E1-09 for the time set in n3-03. Increase this time if the inertia is very high and the motor is still coasting after
HSB is complete.
■
n3-04: High Slip Braking Overload Time
Sets the time required for an HSB overload fault (oL7) to occur when the drive output frequency does not change for
some reason during an HSB stop. This can be caused by the load rotating the motor or by excessive load inertia, resulting
in a high current. To protect the motor from overheat, the drive trips with an oL7 fault if such these conditions lasts
longer than the time set in n3-04.
No. Name Setting Range Default
n3-01 High Slip Braking Deceleration Frequency Width 1 to 20% 5%
No. Name Setting Range Default
n3-02 High Slip Braking Current Limit 100 to 200% Determined by L8-38
No. Name Setting Range Default
n3-03 High Slip Braking Dwell Time at Stop 0.0 to 10.0 s 1.0 s
No. Name Setting Range Default
n3-04 High Slip Braking Overload Time 30 to 1200 s 40 s
SIEP_C710616_35.book 241 ページ ２０１５年１１月３０日 月曜日 午後２時２分
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