WEG SRW 01, User Manual

Page: 81 / 148

Parameterization
SRW 01 | 5-35
5
P611 – External Fault Signal
Adjustable
Range:
0 = Digital Input I11
1 = Digital Input I12
2 = Digital Input I13
3 = Digital Input I14
4 = Digital Input I15
5 = Digital Input I16
Factory
Setting:
3
Proprieties: Sys, rw
Description:
It defines which the digital input that corresponds to the external fault signal is.
P612 – External Fault Signal Logic
Adjustable
Range:
0 = Normally Closed (NC)
1 = Normally Open (NO)
Factory
Setting:
1
Proprieties: Sys, rw
Description:
It defines the logic of the external fault drive signal.
If P612 = 0, normally closed, active in logic level 0 (zero).
If P612 = 1, normally open, active in logic level 1.
P613 – External Fault Protection Action
Adjustable
Range:
0 = Alarm
1 = Switch Off (Trip) Factory
Setting:
1
Proprieties: Sys, rw
Description:
It defines the protective action by external fault.
NOTE!
It is only possible to cause an external fault through the Control Unit (UC) digital inputs. In order
to generate errors or faults, use the USERERR block in the WLP software. In order to get more
information about the WLP software use, refer to the WLP manual, available for download on the
website:
www.weg.net .
5.7.3 Current Imbalance between Phases
The Unbalance protection monitors the three motor phases calculating the current imbalance according to the
equation 02. If the calculated unbalance is higher than the value adjusted at the parameter P614 longer than the time
adjusted at P615, then the motor may be switched off or only an alarm be activated, according to the parameter
P616. The imbalance protection follows the recommendations of the NEMA MG1 standard, establishing that 5 %
voltage imbalance is equivalent to 6 to 10 times in current imbalance, i.e., 5 % voltage imbalance corresponds to
30 to 50 % of current imbalance.
% of imbalance = 100
max_deviation
average_value
Equation 02 - Current imbalance according to NEMA MG1