Connecting Braking Resistor - KEB COMBIVERT M4 Instruction Manual

3.4
Attention Fire Risk!
Connection of the
braking resistor
Connection of the
temperature monitoring
• Bridge, when no monitoring occurs
• Terminals OH
• Do not lay connecting cable together
with control cable
• Only permissible with double-shielding
onto the motor cable!

Connecting braking resistor

In order to enter the overheating of a braking resistor it is absolutely
necessarily the thermal relay of the braking resistor to be monitored.
Overloads may be caused by:
• the ramps are too short
• incorrect dimensioning of the braking resistor
• the input voltage is being too high
• defect of the braking resistor in the inverter or braking module
Protection with defective braking transistor offers excluding switching off
the mains voltage (see figure).
Braking resistors can develop very high surface temperatures, therefore
attach as contact-proof and as far away as possible from inflammable
materials!
• +/PA, PB Terminals for the braking resistor
• during release of the temperature monitoring the input voltage is
switched off
12 11
K1
U
230 or 24 V AC/DC
drive
A simplified protection is achieved, if the links of the temperature sensor are
integrated into the temperature detection in accordance with the following
figure. This measure does not protect with a defect of the brake transistor
however against the developing extreme load with acute fire risk.
12
Installation
PA
PB
OH1
OH2
at 24 V AC/DC
check tripping
Others
K1
11
Temperature sensor (PTC )
1650Ω...4Ω tripping resistance
750Ω...1650Ω reset resistance
X1A
L1
N/L2
L3
++
--
PB
U
V
W
OH
OH
Motor-
PTC
OH
OH
GB - 15