Motor overload monitoring (i²xt) Motor temperature monitoring
In order to record and monitor the motor temperature, a PTC thermistor (single sensor according to DIN 44081 or triple sensor according to DIN 44082) or thermal contact (normally-closed contact) can be connected to the terminals T1 and T2. This measure helps to prevent the motor from being destroyed by overheating.
Preconditions
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The inverter can only evaluate one PTC thermistor! Do not connect several PTC thermistors in series or parallel.
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If several motors are actuated on one inverter, thermal contacts (NC contacts) (TCO) connected in series are to be used.
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To achieve full motor protection, an additional temperature monitoring function with a separate evaluation must be installed.
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By default, a wire jumper is installed between terminals X109/T1 and X109/T2, which must be removed when the PTC thermistor or thermal contact (TCO) is connected.
Details
If 1.6 kΩ < R < 4 kΩ at terminals X109/T1 and X109/T2, the monitoring function will be activated; see functional test below.
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If the monitoring function is activated, the response set in 0x2D49:002 (P309.02) will be effected.
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The setting 0x2D49:002 (P309.02) = 0 deactivates the monitoring function.
If a suitable motor temperature sensor is connected to the terminals X109/T1 and X109/T2 and the response in 0x2D49:002 (P309.02) is set to "Fault [3]", the response of the motor overload monitoring may be set other than "Fault [3]" in 0x2D4B:003 (P308.03).
Motor overload monitoring (i²xt)
Motor overload monitoring (i²xt) Functional test
Connect a fixed resistor to the PTC input:
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R > 4 kΩ : The monitoring function must be activated.
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R < 1 kΩ : The monitoring function must not be activated.
Severity