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Braking Resistors
1.7
Installation instructions
Braking resistors can evolve very high surface temperatures during normal operation. The
following points must be considered absolutely for safe operation:
• Select minimum distances to adjacent units in such way that neither fire risk nor malfunctions
increased by ambient temperature releases.
• Sufficient cooling must be available when the unit is installed in a control cabinet.
• A warning notice "hot surface" must be placed in case of structural measures if
a protection against contact for the service personnel cannot be ensured.
• Connect temperature monitoring of the braking resistors
• Make fire preventions if necessary.
1.8
Selection of the connection type
Ramps too short
ON period too long
Wrong dimensioning of the braking resistor
input voltage too high
Generatoric operation
Short circuit in the braking transistor
Short circuit in the braking transistor (generating)
1) The frequency inverter remains in operation in spite of switched off power supply in generatoric operation.
An error must be released here, which leads to the disconnection of the modulation. This can occur e.g. via
an additional auxiliary contact at the line contactor K1 (terminals 13/14) at terminals T1/T2 or via digital input.
The frequency inverter must be programmed accordingly in each case.
1.9
Connection of a braking resistor without temperature monitoring
Without temperature monitoring
Monitored malfunction
PA
PB
Extended temperature monitoring
Simple temperature monitoring
–
–
–
–
–
–
–
L1
L2
L3
+PA
- -
PB
U
V
W
T1
T2
O
O
O
O
O
O
O
O
O
o
1)
–
O
–
o
1)
GB - 9
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