Power And Temperature Calculation At The Braking Resistor - KEB COMBIVERT F6 Programming Manual

Braking transistor

Power and temperature calculation at the braking resistor

Index Id-Text Name
0x351F is31 braking resistor data
Sub Idx Name
1 rated resistance at 20°C
2 average dissipated power
3 current electrical resistance
4 current wire temperature
5 peak wire temperature
peak power over braking
6
resistor
7 error resistor data
cumulated energy over
8
braking resistor
current power over braking
9
resistor
120
Function
Parameter structure for displaying the power at the
braking resistor
Function
Resistance value of the braking resistor
average absorbed power of the braking resistor
Change of the time constant:
Notice
previous softwares: PT1 time = 4.3 min
new time constant: 2 minutes
Only for sub-mounted braking resistor:
Actual electrical resistance from the temperature
model.
Display when the power unit is not ready:
4294967295: power unit not ready
Without sub-mounted braking resistor identcal with
is31[1]
Actual wire temperature in 0.1 °C resolution
Display if no temperature model is available: -1000:
no temperature available
Display when the power unit is not ready:
32767: power unit not ready
For sub-mounted braking resistor:
Maximum wire temperature in 0.1 °C resolution
Without sub-mounted braking resistor:
Display -1000: no temperature available
Maximum power at the braking resistor
(maximum value of is31[9], stored non-volatile)
0: Data for sub-mounted braking resistor OK
All other values: invalid sub-mounted braking resistor
data
cumulated energy over braking resistor
(resolution: 0.01 kWh)
The value can be reset / set to any value by writing to
the parameter.
Actual power flowing into the braking resistor. The fil-
ter time is calculated from the basic process time
(see description is22)
Filter time without sub-mounted braking resistor: TFil-
ter = 48 * basic Tp
(at Tp = 62.5us TFilter is = 48 * 62.5us = 3ms)
Filter time with sub-mounted braking resistor: TFilter
= 64 * basic Tp
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