YASKAWA CIMR-ZU A Series Programming Manual page 126

1 n Special Ad ustments
n i Slip Bra in ( SB) and O ere citation Bra in
i Slip Bra in ( / )
HSB works in V/f Control only and decreases the stopping time compared to normal deceleration without using dynamic
braking options. HSB reduces the output frequency in large steps to stop the motor and produce a high slip, which dissipates
the regenerative energy created from decelerating the load in the motor windings. Due to the increased temperature of the
motor windings, do not use HSB to frequently stop the motor. The duty cycle should be around 5% or lower.
Notes on Usin i Slip Bra in
• The set deceleration time is ignored during HSB. Use Overexcitation Deceleration 1 (L3-04 = 4) to stop the motor within a
specified time.
• Braking time varies based on the load inertia and motor characteristics.
• Enabling HSB and KEB Ride-Thru simultaneously will trigger an oPE03 error.
• HSB must be triggered by a digital input set to H1-
until the motor is completely stopped and the Run command is cycled.
• Use parameters n3-01 through n3-04 to adjust HSB.
n 1 i Slip Bra in Deceleration Fre uency
Sets the step width for frequency reduction during HSB. Increase n3-01 if DC bus overvoltage (ov) occurs during HSB.
No
n3-01 High Slip Braking Deceleration Frequency Width
n 2 i Slip Bra in 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. This value must not exceed the current rating of the drive.
• 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%.
No
n3-02
n i Slip Bra in D ell ime 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
set to E1-09 for the time set to n3-03. Increase this time if the inertia is very high and the motor coasts after HSB is complete.
No
n3-03
n i Slip Bra in O erload ime
Sets the time required for an HSB overload fault (oL7) to occur when the drive output frequency does not change during an
HSB stop due to excessive load inertia or the load rotating the motor. To protect the motor from overheat, the drive trips with
an oL7 fault if these conditions last longer than the time set in n3-04.
No
n3-04
O ere citation Deceleration (Induction Motors)
Increases the flux during deceleration and allows shorter deceleration time settings. Enabled by setting L3-04 to 4 or 5.
to L3-04: Stall Prevention Selection during Deceleration on page
Notes on O ere citation Deceleration
• Frequently applying Overexcitation Deceleration raises the motor temperature because regenerative energy is mainly
dissipated as heat in the motor. In cases where frequent application is required, make sure the motor temperature does not
exceed the maximum allowable value of Overexcitation Deceleration.
• During Overexcitation Deceleration 2, Hunting Prevention in V/f Control is disabled.
12
Name
Name
High Slip Braking Current Limit
Name
High Slip Braking Dwell Time at Stop
Name
High Slip Braking Overload Time
= 68. After the HSB command is given, the drive will not restart
idt
108.
Settin an e
1 to 20%
Settin an e
Determined by
0 to 200%
Settin an e
0.0 to 10.0 s
Settin an e
30 to 1200 s
De ault
5%
De ault
L8-38
De ault
1.0 s
De ault
40 s
Refer