Commissioning
Setting chopper operation and short−circuit braking
6
63
EDBCSXE040 EN 6.0
6.3 Setting chopper operation and short−circuit braking
The "short−circuit braking" function serves to rapidly discharge the DC bus via the brake
resistor. For this, the brake chopper IGBT is switched on permanently. The low−voltage
supply of the power supply module must be ensured for this purpose.
Stop!
Pay attention to the kinetic energy of permanent−magnet synchronous motors
during short−circuit braking!
Observe when short−circuit braking is deactivated:
ƒ Rapid discharge of the DC bus via the brake resistor is not possible.
ƒ For rapid discharge of the DC bus parameterise the charge relay function of
the connected ECS axis modules with C0175 = 3.
ƒ For the earth−fault test the DC bus is discharged via the brake resistor after
switching on the low−voltage supply, independently of the settings.
ƒ The discharging time depends on the entire DC bus circuit.
Observe when brake chopper IGBT is switched off:
During operation in generator mode
ƒ overvoltage can occur in the DC bus.
ƒ energy cannot be discharged from the DC bus.
ƒ This function is carried out automatically with most error messages ( 67) but it
can also be requested via the master control system or manually.
ƒ As the DC bus must be safely disconnected from the mains for short−circuit braking,
the brake chopper IGBT is switched on with a delay of approx. 150 ms after the
short−circuit braking request.
ƒ The power supply enable input X6/DI1 can be configured in such a way that
short−circuit braking is triggered with a LOW level ( 64).
ƒ The control bit 2 (STE_KSB) can be set by the control system when bus control is
used ( 105).
ƒ In the case of manual operation (C0001 = 1), the STOP key of the keypad XT can also
be configured to short−circuit braking via C0469.
The short−circuit braking function can be activated in the GDC parameter menu ( 71)
under Short setup via C0127.
Parameter
C0127
Designation
Function of integrated brake transistor
Data type: INTEGER_32
Index: 24448
dec
= 5F80
hex
Activation of brake chopper IGBT/fast discharge function (short−circuit braking)
63
Selection list (Lenze setting printed in bold) Information
0 Brake chopper and short−circuit
braking
1 Only brake chopper
2 Only fast discharge function
(short−circuit braking)
4 Without function
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