Sub-Mounted Braking Resistor Protection - KEB COMBIVERT F6 Programming Manual

Braking transistor

Sub-mounted braking resistor protection

If an inverter contains a KEB sub-mounted braking resistor, data (e.g. resistance
value and temperature limits) are stored for the resistor in
sistor.
A non-zero value in
activated. In this case, parameter
of de86[1] total resistor value
Additionally,
be switched off.
When using a KEB sub-mounted braking resistor, the temperature of the braking
resistor wire is monitored by a calculation via a thermal resistance model.
WARNING
Index Id-Text Name
0x2A59 pn89 warning brOH stop mode
0x2A5A pn90 brOH warning level
0x2A5B pn91 brOH error level
The braking resistor is protected by switching off the braking transistor when the
braking resistor temperature reaches the error threshold (pn91).
The error/warning thresholds are configurable by parameters
level and
mounted braking resistor data, found in the de parameters.
ture error level
The reset hysteresis is 80.0°C for the two thresholds.
If the brOH error level
modulation and the braking resistor.
The reaction to exceeding the
brOH stop
The error/warning response is displayed in parameters ru01 / st01, ru02, ru03.
Additionally, it can be parameterized in
braking transistor is deactivated when the warning threshold is exceeded.
If "warning" is set in pn89, it is possible to achieve that the braking transistor is al-
ready deactivated without switching off the modulation.
© 2022 KEB Automation KG
de86[2] means that a braking resistor download is present and
and cannot be changed manually.
is30 braking transistor function
➢ The thermal modeling is only sufficiently accurate if all installation settings re-
garding liquid cooling are observed (see installation manuals of the power
units).
Function
Programmable reaction of the inverter when the warning
level is exceeded
Warning level overtemperature braking resistor
Adjustable from 400°C to maximum temperature of the
resistor
Error level overtemperature braking resistor
Adjustable from 400°C to maximum temperature of the
resistor
pn91 brOH error level. The upper limit of
shows the upper limit for
is exceeded, an error is triggered which switches off the
brOH warning level
mode.
de86 build in brake re-
is31[1] braking resistor value
is automatically activated and cannot
(de86[5] max. temperature error
(de86[5] max. temperature error
pn90 and
pn90 / pn91.
can be set in
pn33 braking transistor options
contains the value
level)
level)
pn90 brOH warning
pn91 is set by sub-
de86[5] max. tempera-
pn89 warning
that the
121