146 Commander SE Advanced User Guide
Issue Number: 4
9 Dynamic braking resistors
SRF 600 zinc plated steel housed power wirewound resistor
The two lower wires in the diagram above, are connected internally to a Klixon bi-metallic switch (normally closed) which
operates at 160°C, and resets at 140°C.
The capability of the switch contacts is 6A @ 230 VAC
This thermal switch must be used as part of a thermal protection circuit, removing the power supply from the drive when
activated. Refer to Chapter 5 Dynamic Braking on page 132, for connection details.
Resistor values available
The resistors can be connected in series or parallel to give you the correct value required or a higher power rating. See
Table 9-1 for minimum and recommended braking resistor values.
When using the braking resistor mounting bracket as described in Chapter 8 Braking resistor brackets , it is advised that no
more than two resistors are mounted on this plate. This will keep the amount of heat dissipated into the drive’s heatsink and
into the RFI filter (if fitted) to an acceptable level.
These resistors are only recommended for a very light duty. They will certainly not be suitable for heavy braking,
especially on the larger kW ratings of drives. Alternative higher power resistors should be sourced.
Resistor characteristics SRF600
Power Rating 80W
Temperature rise 160°C
Resistance tolerance ±5%
Max. working voltage 1,000V
Insulation resistance @ 1,000 VDC 1,000MΩ
Ohmic Value CT Part Number
15Ω 1220-2153
20Ω 1220-2203
30Ω 1220-2303
40Ω 1220-2403
50Ω 1220-2503
75Ω 1220-2753
100Ω 1220-3103
150Ω 1220-3153
57
13
102
68
81
300
2.5mm
2
NOTE
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