5.11 S: Functions for Textile Applications
YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
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S3: Braking Transistor and V/f Ratio Gain
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S3-01: Braking Transistor Operation Selection
Determines when the drive built-in braking transistor is enabled.
0: During run only
1: Always enabled
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S3-02: Braking Transistor Operation Voltage Level
Sets the voltage level that triggers the drive built-in braking transistor.
Note:
This value is for 200 V drives. Double this setting when using a 400 V class drive.
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S3-03: V/f Gain Enable/Disable
Enables and disables the V/f gain setting in MEMOBUS register 03H.
0: Disable
1: Enable
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S3-04: V/f Gain Change Time
Sets the drive uses to change the V/f gain set in MEMOBUS register 03H.
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S4: KEB Mode Selection
S4 parameters define the conditions for how the KEB function operates.
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KEB Function Description
Short for Kinetic Energy Backup, the KEB function helps the drive through power loss. Once power loss is detected,
KEB quickly decelerates the motor, using regenerative energy to maintain voltage levels in the DC bus. This keeps the
drive running through a momentary loss in power. Once power is restored, the drive continues operating as before.
There are three ways that KEB can be performed. Parameter S4-01 determines which method is used.
KEB Mode Selection on page 224
Conditions that Trigger KEB
When KEB is enabled (i.e., S4-01 is not set to 0), it will be triggered by any one of the following conditions:
• A multi-function input terminal set for KEB 1 is activated (H1-
= 65 or 66).
• Voltage in the DC bus has fallen below the level that trips KEB (set in S4-03).
• Voltage fluctuation in the DC bus exceeded the level that trips KEB (set to S4-04).
• Phase loss was detected as defined by the phase loss detection level (S4-08) and the detection time (S4-10).
No.
Name
Setting Range
Default
S3-01
Braking Transistor Operation Selection
0, 1
0
No.
Name
Setting Range
Default
S3-02
Braking Transistor Operation Voltage Level
300 to 400 Vdc
380 Vdc
No.
Name
Setting Range
Default
S3-03
V/f Gain Enable/Disable
0, 1
0
No.
Name
Setting Range
Default
S3-04
V/f Gain Change Time
0.0 to 10.0 s
0.5 s
