Siemens 440 manual Adc Ptc Kty

Parameter Description Issue 01/06

5 V

ADC

PTC

KTY

Fault
F0015		P0601 = 2	&
T1 = 4 s		No sensor
Signal	0
loss	1	PTC
detection		KTY
	2
		ϑ
	P0601	V
Equivalent
circuit data		Thermal	r0631
Power dissipation
		motor	r0632
PV,mot		model
			r0633

1

0

r0035

1

0

P0604

	r0052
	Bit13
≥ 1	Motor
	temp.
	reaction
	P0610

Thermal motor model:

The data, required for the thermal motor model, is estimated from the rating plate data entered during the quick commissioning. This data permits reliable, stable operation for standard Siemens motors. If required, parameter changes must be made for motors from third-party manufacturers. We always recommend that an automatic motor data identification run is made after quick commissioning so that the electrical equivalent circuit diagram data can be determined. This allows a more precise calculation of the losses which occur in the motor which has a positive impact on the accuracy of the thermal motor model.

PTC sensor:

APTC temperature sensor (Positive-Temperature-Characteristic) is a resistor with a positive temperature characteristic which, at normal temperatures, has a low resistance value ( 50-100 Ohm). Normally, three PTC temperature sensors are connected in series in the motor (depending on the motor manufacturer), thus producing a "cold resistance value" ranging from 150 to 300 Ohm. PTC temperature sensors are also frequently referred to as cold conductors.

However, at a certain threshold temperature, the resistance rises rapidly. The threshold temperature is selected by the motor manufacturer in such a way that it corresponds to the nominal temperature value of the motor insulation. This allows the change in the resistance value to be deployed to protect the motor, as the PTCs are embedded in the motor windings. PTC temperature sensors are not suitable for measuring temperature.

When the PTC is connected to the control terminals 14 and 15 of the MM4 and the selection motor temperature sensor has been activated by the setting P0601 = 1 (PTC sensor), the PTC temperature sensor then protects the motor by means of the trip device in the MM4.

Should the resistance value of 2000 Ohm be exceeded, the inverter displays error F0011 (motor overheating).

If the resistance value is below 100 Ohm, the error F0015 (no motor temperature signal) is then output.

This protects the motor from overheating and also from a sensor wire breakage.

The motor is additionally monitored by the thermal motor model in the inverter, thus providing a redundant system for monitoring the motor.

KTY84 sensor:

The sensor KTY84 is basically a semi-conductor thermo-sensor (diode), the resistance value of which varies from some 500 Ohm at 0°C to 2600 Ohm at 300°C. It has a positive temperature coefficient and, in contrast to the PTCs, has an almost linear temperature characteristic. The resistor behaviour is comparable to that of a measuring resistor with a very high temperature coefficient.

Note the following when connecting the polarity. Connect the sensor so that the diode is polarized in the operative direction. That means that the anode needs to be connected to terminal 14 = PTC A (+) and the cathode to terminal 15 = PTC B (-).

If the temperature monitoring function is activated with the setting P0601 = 2, the temperature of the sensor (thus that of the motor windings) is then written to parameter r0035.

The motor overheating warning threshold needs to be assigned with parameter P0604 (the works setting is 130°C). This warning threshold depends on the motors thermal class. Also refer to the table below in this context.

70	MICROMASTER 440 Parameter List
	6SE6400-5BB00-0BP0