Motor - WEG CFW100 Programming Manual

FAULTS AND ALARMS

10.3.2 Motor

The inverter has a function to protect the motor from overtemperature by indicating fault F078. The motor must
have a triple PTC type temperature sensor. The sensor can be read through the analog inputs.
For the reading of the PTC, it is necessary to configure it for current input and select the option "4 = PTC" in P231
or P236. Connect the PTC between the supply +10 Vdc and the analog input.
The analog input reads the PTC resistance and compares it to the limits for the fault. When those values are
exceeded, fault F078 is indicated. As shown in
WARNING!
!
The PTC must have reinforced insulation of the live parts of the motor and other installations.
✓
NOTE!
For this function to work properly, it is important to keep the gain(s) and offset(s) of the analog inputs
at the factory setting values.
Figure 10.1 on page 10-4
10
P037 - Motor Overload Ixt
Range:
Properties:
Description:
It indicates the present motor overload percentage or overload intergrator level. When this parameter reaches 6.3
% the inverter will indicate the motor overload alarm (A046). Or when this parameter reaches 100,0 % the "Motor
Overload" fault (F072) will occur (F072).
Figure 10.2 on page 10-5
normalized in relation to the overload current (P156, P157 or P158).
10-4 | Micro Mini Drives
Table 10.2: Option of parameter P352
P352
0 = OFF
1 = ON
2 = CT
Table 10.3 on page
Table 10.3: Actuation levels of fault F078
PTC Resistance
R < 50 Ω
PTC
50 Ω < R < 3,9 kΩ
PTC
R > 3,9 kΩ
PTC
shows the connection of the PTC to the inverter terminals via analog input.
PTC
Figure 10.1: Connection of the PTC to the frequency inverter
0.0 to 100.0 %
ro
shows the actuation time of the overload as a function of the output current (P003)
Action
Fan off
Fan on
Fan is controlled via software
10-4.
AIx Overtemperature
V > 9,1 V F078
in
9,1 V > V > 1,3 V Standard
in
V < 1,3 V F078
in
+ 10 V
AIx (0 .. 4 to 20 mA)