Siemens MICROMASTER 420 - Manual (Page 80)

3 Functions Issue 07/04
MICROMASTER 420 Operating Instructions
80 6SE6400-5AA00-0BP0
3.5.5.14 Inverter/motor protection
P0290 =...
Inverter overload reaction
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)
P0292 =... Inverter temperature warning
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.
P0335 =... Motor cooling (enters the motor cooling system)
0 Self-cooled: Using shaft mounted fan attached to motor
1 Force-cooled: Using separately powered cooling fan
P0610 =... Motor I 2 t reaction
Defines reaction when motor I 2 t reaches warning threshold.
0 Warning, no reaction, no trip
1 Warning, I
max
reduction, trip F0011
2 Warning, no reaction, trip (F0011)
P0611 =... Motor I 2 t 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 I 2 t warning level (entered in %)
Defines the value at which alarm A0511 (motor overtemperature) is generated.
P0614 =...






P0305
r0027
2
P0310
r0021
Motor
i2t
temp.
reaction
P0610
P0611
P0335
P0614
P0614 1.1 ⋅
Trip threshold
Warning threshold
I_max reduction
A0511
F0011
t
r0034
) t i ( 2
P0640 =... Motor overload factor [%]
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.
0
15 °C
0
2
100 s
100.0 %
150.0 %