Connection Of The Braking Resistor; Connection Temperature Monitoring - KEB COMBIVERT F5 Betriebsanleitung

2.5 Connection Braking
Resistor
2.6 Connection Tempera-
ture Monitoring
a.) Example with PTC (without
temperature control function)
b.) Example with KTY or PT100
(with temperature control func-
22
In order to detect the overheating of a braking resistor it is absolutely necessary to
monitor the temperature switch. The overheating can have following causes:
• ramps too short or the operation-time too long
• incorrect dimension of the braking resistor
• input voltage too high
• defect of braking transistor in the inverter or the braking module
The connection of the mains voltage offers the only protection in the case of a de-
fective braking transistor (see diagram). The connection of the auxiliary contacts of
mains contactor K1 immediately switches off the modulation through fault release
(dependent on Pn.12).
Braking resistors can develop very high surface temperatures, therefore attach as
contact-proof and as far away as possible from inflammable materials!
230 or 24 V AC/DC
• Terminals T1, T2
• Tripping resistance 1,65...4 kOhm
• Reset resistance 0,75...1,65 kOhm
• Design in accordance with VDE 0660 Part 302
• This function can be activated by the machine builder by software
• Do not lay connecting cable together with control cable
• Permissible in the motor cable only with double shielding
KTY- or PT100 sensor may not be
integrated in the temperature monito-
tion)
ring, otherwise the contact of the main
contactor or other switching units will
be simmered!
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at 24 V AC/DC
drive check tripping
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