Nord Drivesystems SK BRU5-1-240-050 User manual

Getriebebau NORD GmbH & Co. KG
Getriebebau-Nord-Straße 1 • 22941 Bargteheide, Germany • www.nord.com
Technical Information / Datasheet
SK BRU5-1-240-050
Brake resistor 275299004 1.0 0821 en
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SK BRU5-1-240-050 Part number: 275 299 004
Footprint braking resistor for connection
to a NORDAC PRO SK 500P
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It only is allowed for qualified electricians to install and commission the module. An electrician is a person
who, because of their technical training and experience, has sufficient knowledge relating to
• switching on, switching off, isolating, earthing and marking power circuits and devices,
• proper maintenance and use of protective devices in accordance with defined safety standards.
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DANGER!
Danger of electric shock
The frequency inverter continues to carry hazardous voltages for up to 5 minutes after it was switched
off.
• Work must not be carried out unless the device has been disconnected from the voltage and at
least 5 minutes have elapsed since the mains was switched off!
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CAUTION
Danger of burns
The module and all other metal components can heat up to temperatures above 70 °C.
• Sufficient cooling time must be allowed for when working on the components in order to avoid injuries
(local burns) to parts of the body coming into contact with the components.
• In order to avoid damage to neighbouring objects, sufficient clearance must be maintained during
installation.
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NOTICE
Validity of this document
This document is only valid in combination with the operating instructions for the relevant frequency
inverter. Safe commissioning of this module and the frequency inverter depends on the availability of
this information.
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Brake resistor – SK BRU5-1-240-050
2 / 9 275299004 - 0821
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Scope of delivery
Module
1 x Bottom-mounted
braking resistor SK BRU5-1-…
2 x Fastening screws M4 x 12 (in the accessories kit)
Field of use
Dynamic braking (frequency lowering) of a three-phase motor via a frequency inverter results in
generator braking energy that – depending on the particular application – is dissipated by a braking
resistor. This excess energy is converted into heat.
The footprint braking resistor is intended for use with the NORDAC PRO SK 500P device series.
Similar to illustration
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Brake resistor – SK BRU5-1-240-050
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Technical Data
Electrical data
Number of wires
2
Short-time power P
max
2)
Resistance
Ω
240
for 1.2 s
kW
0.75
Max. continuous power
Pn
W
50
Rated power P
W
≤80
Max. pulse energy
capacity 1)
kJ
3.2
1) The stated value applies to a single use < 1 s at an ambient temperature of 40°C.
2) The stated value applies to a single use within 120 s.
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General
Temperature range
°C
-10 … 40
(100% ED/S1)
-10 … 50 (70% ED/S3)
Approvals
CE, RoHS, UL recognition
Protection class
IP65
Tightening torque
Mounting
Screws
Nm
1.1 – 1.5
Screws
2 x M4 x 12
(SK 5xxP)
Weight
kg
≈0.31
Screws 1)
2 x M5 x 8
(mounting surface)
1) Not included in the scope of delivery
Dimensions
Overall dimensions
(W x H x D)
mm
65 x 35 x 235
Dimensioning drawing

Brake resistor – SK BRU5-1-240-050
4 / 9 275299004 - 0821
Connections
Designation B+ B-
Cross section / type
AWG 18
Wire colour
White
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Assignment to frequency inverters
Information
Overview in the manual
The footprint braking resistors provided by the NORD DRIVESYSTEMS Group are directly tailored to
the individual frequency inverters.
For detailed information, please refer to the frequency inverter manual "Further documentation and
software www.nord.com", chapter braking resistor (BR).
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Maintenance information
In order to ensure the dissipation of heat energy from the resistor body and the connecting cables, these
must be free from dirt during operation.
Due to temperature development on the resistor’s surface, deposits of flammable material must be
avoided in order to avoid ignition.
Cleaning of the resistor must be carried out with a dry duster on a regular basis when the resistor has
completely cooled down. The use of detergents for cleaning the resistor is generally not permitted.
For detailed information, please refer to the Maintenance and service information chapter in the BU 0600
manual, see "Further documentation and software www.nord.com".
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CAUTION
Overload
In case of overload, the braking resistor would be subject to significantly increased heat. Depending on
the overload degree, this may lead to overheating which permanently damages or even destroys the
braking resistor. As this can be accompanied by risk of fire for components in the vicinity of the resistor,
such overloads must be detected and avoided at an early stage.
• Use optional temperature switch
• Monitoring via parameter settings
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Brake resistor – SK BRU5-1-240-050
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Temperature monitoring
For connection to the frequency inverter, a temperature switch (bi-metal) is optionally available in two
versions for temperature monitoring of the footprint braking resistor. The trigger characteristic selection
depends on the installation position / mounting of the braking resistor.
Installation in the vicinity of the frequency inverter Direct installation below the frequency inverter
Nominal temperature of 180°C
Part No. 275991100
Nominal temperature of 100°C
Part No. 275991200
Information
The enclosed temperature switch fastening material is not required for mounting at the
SK 5xxP frequency inverter.
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NOTICE
Impermissible heating
If the footprint braking resistor is mounted directly below the frequency inverter, a temperature switch
with a nominal switch-off temperature of 100°C (Part No. 275991200) must be used. This is necessary
to prevent impermissible heating of the frequency inverter.
• Failure to observe this may result in damage to the cooling system of the frequency inverter (fan).
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Technical Data
General
Switching temperature
°C
100 ± 5
180 ± 5
Approvals
CE, RoHS, UL
Protection class
IP40
Tightening torque
Mounting
Bimetallic switch
Nm
1.8 – 2.0
Threads
M4
Weight
kg
≈0.05
Wrench size
10
Electrical data
Number of wires
2
Switching cycles
10000
Voltage
V
250 AC
24 DC
Current
AC
A
2.5 1) / 1.6 2)
DC
A
2.0
1) Stated value is cos φ= 1.
2) Stated value is cos φ= 0.6.