Siemens 420 manual Inverter/motor protection

0

2

100 s

3 Functions Issue 07/04

3.5.5.14Inverter/motor protection

P0290 =...

P0292 =...

P0335 =...

P0610 =...

P0611 =...

P0614 =...

Inverter overload reaction		0
Selects reaction of inverter to an internal over-temperature.
0	Reduce output frequency
1	Trip (F0004)
2	Reduce pulse frequency and output frequency
3	Reduce pulse frequency then trip (F0004)
Inverter temperature warning		15 °C

Defines the temperature difference (in ºC) between the Overtemperature trip threshold and the warning threshold of the inverter. The trip threshold is stored internally by the inverter and cannot be changed by the user.

Motor cooling (enters the motor cooling system)

0Self-cooled: Using shaft mounted fan attached to motor

1Force-cooled: Using separately powered cooling fan

Motor I2t reaction

Defines reaction when motor I2t reaches warning threshold.

0Warning, no reaction, no trip

1Warning, Imax reduction, trip F0011

2Warning, no reaction, trip (F0011)

Motor I2t time constant (entered in s)

The time until the thermal limit of a motor is reached, is calculated via the thermal time constant. A higher value increases the time at which the motor thermal limit is reached. The value of P0611 is estimated according to the motor data during quick commissioning or is calculated using P0340 (Calculating of the motor parameters). When the calculation of motor parameters during quick commission is complete the stored value can be replaced by the value given by the motor manufacturer

Motor I2t warning level (entered in %) 100.0 %

Defines the value at which alarm A0511 (motor overtemperature) is generated.

Trip threshold 1.1⋅ P0614

P0611

r0027 2

   P0305 

r0021

P0310

		Motor
			F0011
	r0034	i2t
		temp.	I_max reduction
	( i2 t )
t		reaction
		P0610	A0511

P0335

P0614

Warning threshold

P0640 =...

Motor overload factor [%] 150.0 %

Defines motor overload current limit in [%] relative to P0305 (rated motor current). Limited to maximum inverter current or to 400 % of rated motor current (P0305), whichever is the lower.

MICROMASTER 420	Operating Instructions
80	6SE6400-5AA00-0BP0