Commissioning, Stop – Lenze ECSCExxx Power supply module User Manual
Page 68
Commissioning
Setting chopper operation and short−circuit braking
l
68
EDBCSXE040 EN 7.0
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 (
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 (
¶ 69).
ƒ
The control bit 2 (STE_KSB) can be set by the control system when bus control is
used (
¶ 95).
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 (
^ 75)
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)
^ 68
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