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Rexroth Frequency Converter EFC x610
Series
12.3.5 Motor Thermal Model
This function is designed to protect the motor from over-temperature according
internal thermal model.
Code
Name
Motor thermal model
C1.69
protection setting
Motor thermal model
C1.74
protection time constant
[C1.74] is obtained by the equation below:
Cv:
Specific heat capacity
(J/kg)
Cv of iron (Fe):
450 J/kg
Fig. 12-24: Motor thermal protection time constant
Increase the value of C1.74 'Motor thermal model protection time constant' ap-
propriately if motor overload protection error code 'OL -2' occurs frequently. This
function can be disabled by setting [C1.69] = 0, if necessary.
Ensure that the converter output current does not exceed 110 % of
the [C1.07] 'Motor rated current'.
Motor derating frequency at low speed
This function is used to reduce the overload and thermal risks as motors have
worse cooling performance at low speed compared with it at rated speed.
Code
Name
Low speed derating fre-
C1.75
quency
C1.76 Zero speed load
Setting range
0: Inactive
1: Active
0.0...400.0 min
Cv of aluminum (Al): 900 J/kg
M:
Setting range
0.10...300.00
25.0...100.0 %
R912005854_Edition 09 Bosch Rexroth AG
Functions and Parameters
Default
Unit
Step
0
-
DOM
min
0.1
Motor weight (kg)
Default
Unit
Step
25.00
-
0.01
25.0
-
0.1
161/653
Attri.
-
Stop
Stop
Attri.
Run
Run
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