User`s manual

Faults and Alarms
15-4 | MW500
15
P0343 – Fault Mask
Adjustable
Range:
0000h to FFFFh Factory
Setting:
0007h
Properties: cfg
Access Groups
via HMI:
Description:
This parameters allows the user to control the reporting of several different failures, as described:
Bit 0 = F0074
Bit 1 = F0048
Bit 2 = F0078
Bit 3 = F0079
Bit 4 = F0076
Bit 5 = F0179
Bit 6 to 15 = Reserved
ATTENTION!
Disable the ground fault or overload protections may damage the inverter. Only do that under WEG
technical directions.
15.3 MOTOR OVERTEMPERATURE PROTECTION (F0078)
This function protects the motor against overtemperature through indication of fault F0078.
The motor needs a temperature sensor of the triple PTC type. The reading of the sensor can be done in two
different ways: through the analog input or through the digital input.
For the reading of the PTC via analog input, it is necessary to configure it for current input and select option
“4 = PTC” in P0231, P0236 or P0241. Connect the PTC between source +10 Vdc and the analog input, as
well as close the AIx configuration DIP-Switch in "mA".
The analog input reads the PTC resistance and compares it to the limits values for the fault. When those values
are exceeded, fault F0078 is indicated, as shown in Table 15.1 on page 15-4.
ATTENTION!
The PTC must have reinforced electrical insulation up to 1000 V.
Table 15.1: Actuation level of fault F0078 PTC via analog input
PTC Resistance AIx Overtemperature
R
PTC
< 50 Ω V
IN
> 9.1 V F0078
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 F0078
NOTE!
For this function to work properly, it is important to keep the gain(s) and offset(s) of the analog inputs
at the standard values.
For the PTC via digital input it is necessary to set the option 29 (PTC) in the DIx programming in P0263 to P0270,
and connect the PTC to the referred digital input and to the GND. The resistance levels of the triple PTC are the
same as those of the analog input in Table 15.1 on page 15-4, but the short circuit of PTC (R
PTC
< 50 Ω) cannot
be detected, and thus it is seen as normal operation. Only the case R
PTC
> 3.9 kΩ activates fault F0078.