WEG SRW 01, User Manual

Page: 98 / 148

Parameterization
5-52 | SRW 01
5
max_deviation
% unbalance = 100 average_value
Equation 3 - Voltage unbalance as per NEMA MG1
P649 – Voltage Unbalance
Adjustable
Range:
1 to 30 %
Factory
Setting:
5 %
Proprieties: Sys, rw
Description:
It defines the voltage unbalance percentage between the phases.
P650 – Voltage Unbalance Time
Adjustable
Range:
0 = Disable
1 to 99 s Enabled Factory
Setting:
3 s
Proprieties:
Sys, rw
Description:
It defines the voltage unbalance time between the phases to shut down the motor or signal an alarm. If
P650 = 0, the function is disabled.
P651 – Voltage Unbalance Protection Action
Adjustable
Range:
0 = Alarm
1 = Switch Off (Trip) Factory
Setting:
1
Proprieties:
Sys, rw
Description:
It defines the voltage unbalance protection action.
NOTE!
Use this protection to detect and protect the motor against little voltage unbalances. For unbalance
levels over 35 %, use the Phase Loss protection (voltage).
NOTE!
The voltage unbalance protection only works for three-phase motors. It is only available when the
Current/Voltage Measurement Unit (UMCT) is used.
5.7.18 Phase Loss (Voltage)
The phase loss protection is based on the voltage unbalance protection. It monitors the voltage of the three
phases of the motor. If a voltage unbalance greater than 35 % is detected for the period adjusted in parameter
P652, the motor can be shut down or just an alarm can be activated, according to parameter P653.
P652 – Phase Loss Time (Voltage)
Adjustable
Range:
0 = Disable
1 to 99 s Enabled Factory
Setting:
3 s
Proprieties: Sys, rw