nord NORDAC FLEX SK 200E Series User Manual page 206

NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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P-limit chopper
P555
(chopper power limit)
5 ... 100 % With this parameter it is possible to program a manual (peak) power limit for the braking resistor.
The switch-on delay (modulation level) for the chopper can only rise to a certain maximum
{ 100 }
specified limit. Once this value is reached, irrespective of the level of the DC link voltage, the VFD
switches off the current to the resistor.
The result would be an overvoltage switch-off of the VFD.
The correct percentage value is calculated as follows:
Pos : 553 /Anleitungen/El ektr onik /FU und Starter/5. Par ameter/Par ameter auflistung (P000 ...)/P500- P599/Param eter P555_P557 – Informati on [SK 2x xE] @ 21\m od_1528461024571_14638.docx @ 2425153 @ @ 1
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Braking resistor
P556
(braking resistor)
1 ... 400 Ω
Value of the brake resistance for the calculation of the maximum braking power to protect the
resistor.
{ 120 }
Once the maximum continuous output (P557) including overload (200 % for 60 s) is reached, an
2
I t limit error (E003.1) is triggered. Further details in (P737).
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Brake resistor type
P557
(Braking resistor power)
0.00 ... 20.00 kW Continuous power (nominal power) of the resistor, to display the actual utilization in (P737). For a
correctly calculated value, the correct value must be entered into (P556) and (P557).
{ 0.00 }
0.00 = Off, monitoring disabled
Pos : 557 /Anleitungen/El ektr onik /FU und Starter/5. Par ameter/Par ameter auflistung (P000 ...)/P500- P599/Param eter P555_P557 – Informati on [SK 2x xE] @ 21\m od_1528461024571_14638.docx @ 2425153 @ @ 1
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206
R = Resistance of the braking resistor
P = Momentary peak power of the braking resistor
maxBW
U = VFD chopper operating point
max
1~ 115/230 V
3~ 230 V
3~ 400 V
Information
Use of an external braking resistor: DIP switch S1:8: Setting "0" (Off). Set the parameters
according to the braking resistor that is being used.
Use of an internal braking resistor: DIP switch S1:8: Setting "I" (On). Parameter settings
have no effect.
(chapter 2.3.2) (chapter 2.3.1)
Information
Use of an external braking resistor: DIP switch S1:8: Setting "0" (Off). Set the parameters
according to the braking resistor that is being used.
Use of an internal braking resistor: DIP switch S1:8: Setting "I" (On). Parameter settings
have no effect.
(chapter 2.3.2) (chapter 2.3.1)
Information
Use of an external braking resistor: DIP switch S1:8: Setting "0" (Off). Set the parameters
according to the braking resistor that is being used.
Use of an internal braking resistor: DIP switch S1:8: Setting "I" (On). Parameter settings
have no effect.
(chapter 2.3.2) (chapter 2.3.1)
k [%]
⇒ 440 V=
⇒ 500 V=
⇒ 1000 V=
(chapter 4.3.2.2)
(chapter 4.3.2.2)
(chapter 4.3.2.2)
S
R * P
=
max BW
* 100 %
2
U
max
S
S
BU 0200 en-US-4920