3 Commissioning
MICROMASTER 430 Operating Instructions
46 6SE6400-5AC00-0BP0
External motor thermal overload protection
When operated below rated speed, the cooling effect of fans fitted to the motor
shaft is reduced. Consequentially, most motors require de-rating for continuous
operation at low frequencies. To ensure that the motors are protected against
overheating under these conditions, a PTC temperature sensor must be fitted to
the motor and connected to the inverter control terminals. P0601 must also be set
to 1.
If the PTC in the motor is connected to the MICROMASTER 440 control terminals
14 and 15 and the PTC function enabled by setting P0601 = 1, then the
MICROMASTER 440 will operate as normal providing the resistance at the
terminals remains below approximately 1500 Ω. If this value is exceeded, the
inverter indicates a warning A0510 and then a fault. The actual resistance value at
which this occurs will not be less than 1000 Ω, and not more than 2000 Ω.
With KTY84 sensor
The KTY84 has to be connected so that the diode is forward biased; that is the
anode is connected to PTC A (+) and the cathode to PTC B (-).
If the temperature monitoring function is enabled by setting P0601 = 2, the
temperature of the sensor (and therefore the motor windings) is written to
parameter r0035. The threshold motor temperature can now be set using
parameter P0604 (default setting 130 °C).
Connection failure
If the connection to the PTC or KTY84 sensor becomes open circuit or short circuit,
a fault will be indicated, and by default the drive will trip.
NOTE
To enable the trip function, set parameter P0701, P0702 or P0703 = 29.
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