5.6
Additional parameters
BU 0500 GB
Subject to technical alterations
113
Parameter
Set value / Description / Note
Device
Supervisor
Parameter
set
P554
Min. chopper trigger point
S
65 ... 100 %
[ 65 ]
The switching threshold of the brake chopper can be influenced with this parameter. An optimised
value for numerous applications is set in the factory setting. This parameter can be increased for
applications where pulsating energy is returned (crank drives) to minimise brake resistance power
dissipation.
An increase in this setting leads to a faster overvoltage FI switch off.
P555
Chopper power limit
S
5 ... 100 %
[ 100 ]
With this parameter it is possible to program a manual (peak) power limit for the brake resistor.
The switch-on delay (modulation level) for the chopper can only rise to a certain maximum
specified limit. Once this value has been reached, irrespective of the level of the link voltage, the
inverter switches off the current to the resistor.
The result would be an overvoltage switch-off of the FI.
P556 Braking
resistor
S
20 ... 400
Ω
[ 120 ]
Value of the brake resistance for the calculation of the maximum brake power to protect the
resistor.
Once the maximum continuous output (P557) including overload (200% for 60s) is reached, an I
2
t
limit error (E003.1) is triggered. Further details in P737.
P557
Braking resistor power
S
0.00 ... 20.00 kW
[ 0.00 ]
Continuous power (nominal power) of the resistor, to display the actual utilisation in P737. For a
correctly calculated value, the correct value must be entered into P556 and P557.
0.00 =
Monitoring disabled
P558 Magnetizing
time
S P
0 / 1 / 2 ... 500 ms
[ 1 ]
The ISD control can only function correctly if there is a magnetic field in the motor. For this
reason, a DC current is applied before starting the motor. The duration depends on the size of the
motor and is automatically set in the factory setting of the FI.
For time critical applications, the magnetizing time can be set or deactivated.
0 =
disabled
1 =
automatic calculation
2 ... 500 =
Time set in [ms]
NOTE:
Setting values that are too low can reduce the dynamics and starting torque.
P559
DC run-on time
S P
0.00 ... 30.00 s
[ 0.50 ]
Following a stop signal and the braking ramp, a direct current is briefly applied to the motor to fully
bring the drive to a stop. Depending on the inertia, the time for which the current is applied can be
set in this parameter.
The current level depends on the previous braking procedure (current vector control) or the static
boost (linear characteristic).
P560
Save on EEPROM
S
0 ... 1
[ 1 ]
0 =
Changes to the parameter settings are no longer saved on the EEPROM. All previously
saved settings are retained, even if the FI is disconnected from the mains.
1 =
All parameter changes are automatically written to the EEPROM and remain stored there
even if the FI is disconnected from the mains supply.
NOTE:
If BUS communication is used to implement parameter changes, it must be ensured that
the maximum number of write cycles (100,000 x) in the EEPROM is not exceeded.
