Operating instructions

Issue 10/06 6 Commissioning
MICROMASTER 430
Operating Instructions (Compact)
39
6.3.13 Motor protection
In addition to the thermal motor protection, the motor temperature is also included
in the adaptation of the motor equivalent circuit diagram data. For MM430 the
motor temperature can only be measured using a KTY84 sensor. For the
parameter setting P0601 = 0,1, the motor temperature is calculated / estimated
using the thermal motor model.
If the frequency inverter is permanently supplied with an external 24V voltage, then
the motor temperature is also tracked/corrected using the motor temperature time
constant – even when the line supply voltage is switched-out.
Motor cooling (Selects motor cooling system used)
0 Self-cooled: Using shaft mounted fan attached to motor
1 Force-cooled: Using separately powered cooling fan
2 Self-cooled and internal fan
3 Force-cooled and internal fan
Motor temperature sensor
Selects the motor temperature sensor.
0 No sensor
1 PTC thermistor (PTC)
2 KTY84
r0631
ADC
5 V
Signal
loss
detection
T
1
= 4 s
2
1
No sensor
PTC
KTY
0
P0604
Fault
F0015
&
P0601 = 2
Thermal
motor
model
r0633
r0632
r0035
1≥
Motor
temp.
reaction
P0610
P0601
Equivalent
circuit data
P
V,mot
Power dissipation
V
ϑ
0
1
0
1
r0052
Bit13
PTC
KTY
Alarm threshold, motor overtemperature
Defines the alarm threshold for the motor overtemperature protection. This threshold, where
either a shutdown (trip) or Imax reduction is initiated (P0610) always lies 10 % above the
alarm threshold.
ϑ
warn
:
ϑ
trip
:
Trip threshold (max. permissible temperature)
P0604 1.1 1.1
warntrip
⋅=⋅=
ϑϑ
Warning threshold (P0604)
The alarm threshold should be at least 40 °C greater than the ambient temperature P0625.
P0604 ≥ P0625 + 40 °C
Inverter temperature reaction
Defines reaction when motor temperature reaches warning threshold.
0 No reaction, warning only
1 Warning and I
max
reduction (results in a lower output frequency)
2 Warning and trip (F0011)
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.
2
0
P0601 = ...
P0604 = ...
130.0 °C
P0610 = ...
0
P0335 = ...
P0640 = ...
150.0 %