WEG CFW300 V1.3X, Programming Manual

Page: 122 / 157

Faults and Alarms
14-4 | CFW300
14
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
Table 14.3 on page 14-4 .
Table 14.3: Actuation levels of fault F078
PTC Resistance AIx Overtemperature
R
PTC
< 50 Ω V
IN
> 9.1 V F078
50 Ω < R
PTC
< 3.9 kΩ 9.1 V > V
IN
> 1.3 V Standard
R
PTC
> 3.9 kΩ V
IN
< 1.3 V F078
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 14.2 on page 14-4 shows the connection of the PTC to the inverter terminals via analog input.
+10 V
AIx (0...4 to 20 mA)
PTC
Figure 14.2:
Connection of the PTC to the CFW300
14.4 OVERCURRENT PROTECTION (F070)
The ground fault and output overcurrent protections act very fast by means of the hardware to instantly cut the
output PWM pulses when the output current is high. Fault F070 corresponds to a current surge between output
phases.
The protection current level depends on the used power module so as the protection is effective, still this value is
well above the inverter rated operating current (P295).
14.5 LINK VOLTAGE SUPERVISION (F021 AND F022)
The DC link voltage is constantly compared to the maximum and minimum values according to the inverter power
supply, as shown in
Table 14.4 on page 14-4 .
Table 14.4: Levels of performance monitoring of the DC link voltage
Supply Level F021 Level F022
100 to 127 Vac 200 Vdc 460 Vdc
200 to 240 Vac 200 Vdc 410 Vdc
14.6 VVW CONTROL MODE SELF-TUNING FAULT (F033)
At the end of the self-tuning process of the V VW mode (P408 = 1), if the estimate motor stator resistance (P409)
is too high for the inverter in use, the inverter will indicate fault F033. Besides, the manual modification of P409
may also cause fault F033.
14.7 REMOTE HMI COMMUNICATION FAULT ALARM (A700)
After connecting the remote HMI to the CFW300 terminals, the communication with the HMI is supervised so that
alarm A700 is activated whenever this communication link is broken.