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Parameters
7.3 Parameters
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 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:
12:
13:
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).
For a thermal power unit overload, an appropriate alarm or fault is output, and r2135.15 or r2135.13 set.
See also: r0036, r0037, p0230, r2135
See also: A05000, A05001, A07805
NOTICE
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 variable
torque such as for pumps and fans).
Under overload conditions, the current and torque limit are reduced, and therefore the motor is braked and forbidden
speed ranges (e.g. minimum speed p1080 and suppression [skip] speeds p1091 ... p1094) can be passed through.
For p0290 = 2, 3, 12, 13, the I2t overload detection of the power unit does not influence the response "Reduce pulse
frequency".
When the motor data identification routine is selected, p0290 cannot be changed.
For short-circuit/ground fault detection, when the test pulse evaluation is active via p1901 "Test pulse evaluation
configuration", the pulse frequency at the instant of switch on is briefly reduced.
p0292[0...1]
Power unit temperature alarm threshold / PU T_alrm thresh
Access level: 3
Can be changed: T, U
Unit group: -
Min:
0 [°C]
Description:
Sets the alarm threshold for power unit overtemperatures. The value is set as a difference to the tripping (shutdown)
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] = Overtemperature heat sink
[1] = Temperature rise power semiconductor (chip)
Dependency:
See also: r0037, p0290
See also: A05000, A05001
386
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)
I_output or f_output and automatic pulse frequency reduction
Automatic pulse frequency reduction
Calculated: -
Scaling: -
Unit selection: -
Max:
25 [°C]
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Data type: FloatingPoint32
Dynamic index: -
Function diagram: 8021
Factory setting:
[0] 5 [°C]
[1] 15 [°C]
SINAMICS G120XA converter
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