NORD Drivesystems BU0505 - Manual (Page 136)

SK 54xE – Users Manual for Frequency Inverters
136 BU 0505 GB-1013
P555
P - limit chopper
(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, the inverter switches off the current to the
resistor, irrespective of the level of the link voltage.
The result would be an overvoltage switch-off of the FI.
The correct percentage value is calculated as follows:
% 100 *
*
[%]
2
max
max
U
P R
k BR
=
R = Resistance of the brake resistor
P
maxBR
= Momentary peak power of the brake resistor
U
max
= Chopper switching wave of the FI
1~ 115/230V
Þ 440V=
3~ 230V~
Þ 500V=
3~ 400V~
Þ 1000V=
Pos : 319 /Anleit ungen/5. / 6. Parametrier ung [BU 0500 / BU 0200]/ Par ameter/ P500-P599/ Paramet er P556 – Brems wi derst and @ 0\ mod_1328098726859_388.doc x @ 12146 @ @ 1
P556
Braking resistor
(Brake resistor)
S
1 ... 400
W
{ 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.
Pos : 320 /Anleit ungen/5. / 6. Parametrier ung [BU 0500 / BU 0200]/ Par ameter/ P500-P599/ Paramet er P557 – Leist ung Brems wi ders tand @ 0\ mod_1328098773656_388.doc x @ 12169 @ @ 1
P557
Brake resistor type
(Brake resistor power)
S
0.00 ... 320.00 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
Pos : 321 /Anleit ungen/5. / 6. Parametrier ung [BU 0500 / BU 0200]/ Par ameter/ P500-P599/ Paramet er P558 – M agnetisi erungszei t @ 0\ mod_1328098814188_388.doc x @ 12192 @ @ 1
P558
Flux delay
(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 = Switched off
1 = Automatic calculation
2 ... 500 =Time set in [ms]
NOTE: Setting values that are too low can reduce the dynamics and starting torque.
Pos : 322 /Anleit ungen/5. / 6. Parametrier ung [BU 0500 / BU 0200]/ Par ameter/ P500-P599/ Paramet er P559 – DC-N ac hlaufz eit @ 0\ mod_1328098856657_388. doc x @ 12215 @ @ 1
P559
DC Run-on time
(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).
Pos : 323 /Anleit ungen/5. / 6. Parametrier ung [BU 0500 / BU 0200]/ Par ameter/ P500-P599/ Paramet er P560 – Paramet er Speic hermode @ 0\ mod_1328098918376_388. doc x @ 12238 @ @ 1