Siemens SINAMICS G120 Manual page 50

Parameters
List of Parameters
p0290 Power unit overload response / PU overld response
Access level: 3
Can be changed: T
Units group: -
Min
0
Description: Sets the response to a thermal overload condition of the power unit.
The following quantities can result in a response to thermal overload:
- heat sink temperature (r0037.0)
- chip temperature (r0037.1)
- power unit overload I2T (r0036)
Possible measures to avoid thermal overload:
- reduce the output current limit r0289 and r0067 (for closed-loop speed or torque control) or the output frequency
(for U/f control) indirectly via the output current limit and the intervention of the current limiting controller).
- reduce the pulse frequency.
A reduction, if parameterized, is always realized after an appropriate alarm is output.
Value: 0:
1:
2:
3:
Dependency: If a sine-wave filter is parameterized as output filter (p0230 = 3, 4), then only responses can be selected without
pulse frequency reduction (p0290 = 0, 1).
If a fault or alarm is present, then r2135.13 or r2135.15 is set.
Refer to: r0036, r0037, p0230, r2135
Refer to: A05000, A05001, A07805
Caution: If the thermal overload of the power unit is not sufficiently reduced by the actions taken, the drive is always shut
down. This means that the power unit is always protected irrespective of the setting of this parameter.
Note: The setting p0290 = 0, 2 is only practical if the load decreases with decreasing speed (e.g. for applications with vari-
able torque such as for pumps and fans).
Under overload conditions, the current and torque limit are reduced, and therefore the motor is braked and forbid-
den speed ranges (e.g. minimum speed p1080 and suppression [skip] speeds p1091 ... p1094) can be passed
through.
For p0290 = 2, 3, the I2t overload detection of the power unit does not influence the responses.
When the motor data identification routine is selected, p0290 cannot be changed.
p0292[0...1] Power unit temperature alarm threshold / PU T_alrm thresh
Access level: 3
Can be changed: U, T
Units group: -
Min
0 [°C]
Description: Sets the alarm threshold for power unit overtemperatures. The value is set as a difference to the tripping (shut-
down) temperature.
Drive:
If this threshold is exceeded, an overload alarm is generated and the system responds as parameterized in p0290.
Infeed:
When the threshold value is exceeded, only an overload alarm is output.
Index: [0] = Heat sink temperature
[1] = Power semiconductor (chip) temperature
Dependency: Refer to: r0037, p0290
Refer to: A05000
1-50
Reduce output current or output frequency
No reduction, shutdown when overload threshold is reached
Reduce I_output or f_output and f_pulse (not using I2t)
Reduce the pulse frequency (not using I2t)
Calculated: -
Scaling: -
Unit selection: -
Max
3
Calculated: -
Scaling: -
Unit selection: -
Max
25 [°C]
SINAMICS G120 Control Units CU230P-2 Parameter Manual (LH9), 01/2011
Data type: Integer16
Data set: -
Factory setting
2
Data type: FloatingPoint32
Data set: -
Factory setting
[0] 5 [°C]
[1] 15 [°C]
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