Brake Resistors - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
Electrical Data
Resistor connection:
PTC compliant with DIN 44081 and DIN 44082
Number
Shut-off value
Reset value
Trigger tolerance
Collective resistance of the sensor loop
Terminal voltage
Sensor current
Short circuit
Power consumption
Testing conditions:
EN 60 947-8
Measurement voltage surge resistance
Overvoltage category
Degree of pollution
Measurement isolation voltage Vbis
Reliable galvanis isolation until Vi
Perm. ambient temperature
Moisture
EMC resistance
EMC emissions
Vibration resistance
Shock resistance
Safety system values:
EN 61508, ISO 13849 for Tu = 75
Category
SIL
HFT
PFD (for yearly functional test)
SFF
λ + λ
s DD
λ
DU
Ordering number 130B1137

8.8. Brake Resistors

In applications where the motor is used as a brake, energy is generated in the motor and send back into the frequency converter. If the energy can not
be transported back to the motor it will increase the voltage in the converter DC-line. In applications with frequent braking and/or high inertia loads this
increase may lead to an over voltage trip in the converter and finally a shut down. Brake resistors are used to dissipate the excess energy resulting from
the regenerative braking. The resistor is selected in respect to its ohmic value, its power dissipation rate and its physical size. Danfoss offers a wide verity
of different resistors that are specially designed to our drive code numbers can be found in section
o
C ongoing
MG.33.BA.02 - VLT ® is a registered Danfoss trademark
8. Options and Accessories
ATmosphère EXplosive (ATEX)
1..6 resistors in series
3.3 Ω.... 3.65 Ω ... 3.85 Ω
1.7 Ω .... 1.8 Ω ... 1.95 Ω
≤ 2.5 V for R ≤ 3.65 Ω, ≤ 9 V for R = ∞
20 Ω ≤ R ≤ 40 Ω
EN 60068-2-1 Dry heat
5 --- 95%, no condensation permissible
10 ... 1000 Hz 1.14g
2 for maintenance cycle of 2 years
1 for maintenance cycle of 3 years
How to order
.
± 6 o C
< 1.65 Ω
≤ 1 mA
60 mA
8
6000 V
III
2
690 V
500 V
o o
-20 C ... +60 C
EN61000-6-2
EN61000-6-4
50 g
2
0
4.10 *10 -3
90%
8515 FIT
932 FIT
161