Nord Drivesystems NORDAC LINK SK250E-FDS - Brake Resistor (B+, B-, PE)

NORDAC LINK (SK 250E-FDS ... SK 280E-FDS) – Users Manual for Frequency Inverters as Field Distributors
44 BU 0250 en-3021
2.3.2.3 Brake resistor (B+, B-, PE)
During dynamic braking (frequency reduction) of a three-phase motor, electrical energy is returned to
the inverter as necessary. An internal or external braking resistor can be used to avoid shut-down of
the device due to overvoltage. With this, the integrated brake chopper (electronic switch) pulses the
link circuit voltage (switching threshold approx. 720 V DC) into the brake resistor. The brake resistor
converts excess energy into heat.
Pos: 116 /Anleitungen/ Elektronik/F U und Starter/2. Montage und Ins tallation/Elektr ischer Anschluss/ SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE -FDS/Leistungstei l/Elektrischer Anschluss Leistungstei l_Teil3 - Bremswiders tand_02 [SK 2xxE-FDS] @ 38\ mod_1568104222057_388. docx @ 2558283 @ 5 @ 1
Internal braking resistor
Depending on the power of the inverter, brake resistors with the following key data are installed.
Installation of a brake resistor is optional. This is carried out at the factory and must therefore be taken
into account in the order. Subsequent installation is not possible.
SK 2xxE-FDS-… Resistance Max. continuous
output / limit
2)
(P
n
)
Power
consumption
1)
(P
max
)
…370-340- to …301-340-
400 Ω
100 W / 25 % 1.0 kWs
…401-340- to …751-340-
200 Ω
200 W / 25 % 2.0 kWs
1)
Maximum once within 10 s
2)
2)
In order to prevent non-permissible heating of the device, the continuous power is limited to 1/4 of
the rated power of the brake resistor.
This also has a limiting effect on the energy consumption.
Pos: 117 /Anleitungen/ Elektronik/F U und Starter/2. Montage und Ins tallation/Elektr ischer Anschluss/ SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE -FDS/Leistungstei l/Elektrischer Anschluss Leistungstei l_Teil3 - Bremswiders tand_03 [SK 2xxE-FDS] @ 20\ mod_1516632108015_388. docx @ 2384499 @ 5 @ 1
External braking resistor
If greater braking powers are to be expected, these can only be dissipated with an external brake
resistor. A corresponding plug connection is then provided on option slot X2 or X4 (only Size 2).
The plug connector is installed at the factory and must therefore be taken into account in the order.
Subsequent installation is not possible.
For the dimensioning of an external brake resistor, the electrical specifications ( Section 7
"Technical data") must be complied with in order to prevent damage to the inverter or the brake
resistor due to overload.
A short, screened connection should be selected.
Pos: 118 /Anleitungen/ Elektronik/F U und Starter/2. Montage und Ins tallation/Elektr ischer Anschluss/ SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE -FDS/Leistungstei l/Elektrischer Anschluss Leistungstei l_Teil3 - Bremswiders tand_04 [SK 2xxE-FDS] @ 38\ mod_1568187712133_388. docx @ 2558880 @ @ 1
SK BRW5-… Resistance Max. continuous
power
(P
n
)
Energy
consumption
1)
(P
max
)
Part No. Document
…1-300-225
300 Ω
225 W 4.0 kWs
278281070
TI 278281070
…2-150-450
150
Ω
450 W
8.0 kWs
278281071
TI 278281071
1)
maximum once within 120 s
2)
Connection of the braking resistor to the frequency inverter is made with one of the following optionally
available connection cables.
Designation Cable length UL approval Document
SK CE-HQ2-K-BRW5-OE-2_0M
Approx. 2.0 m
No
TI 275274881
SK CE-HQ2-K-BRW5-OE-2UL
Approx. 2.0 m
Yes
TI 275274280
SK CE-HQ2-K-BRW5-OE-3UL
Approx. 3.0 m
Yes
TI 275274281
Pos: 119 /Anleitungen/ Elektronik/F U und Starter/2. Montage und Ins tallation/Elektr ischer Anschluss/ SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE -FDS/Leistungstei l/INFORMATION - E xterner Bremswiderstand [ SK 2xxE-FDS] @ 20\mod_15166133 72759_388.docx @ 23843 20 @ @ 1