S611 Soft Starter MN03902011E—May 2012 www.eaton.com 53
Under Load
When the bypass contactors are closed, the S611 monitors the average value of the
three-phase power or currents as a percent of rated kW or Current. The unit will trip with a
load disconnect fault if the monitored value falls below the trip threshold for greater than the
trip delay time. The low power setting should be used when trying to detect a dead headed
pump.
Under Load Settings
Current Imbalance
The S611 monitors the current imbalance when the motor is running. The unit will trip with a
motor phase imbalance fault if the current imbalance trip is enabled and the percent
imbalance exceeds the trip threshold for the trip delay and the maximum current is greater
than half the FLA setting.
Current Imbalance Settings
Phase Loss
The S611 monitors the current imbalance when the motor is running. Phase loss is an
extreme case of current imbalance. The unit will trip with a motor phase loss fault if the phase
loss trip is enabled, the percent imbalance exceeds the trip threshold for the trip delay and
current increases above FLA trip setting.
Phase Loss Settings
Parameter Set Point Range Step Default Notes
Trip threshold OFF, 1–50% rated 1% Off Settable from the UI
Mode O/P LED
Protection Load disconnect %
Trip delay 1–60 seconds 1 5 seconds Settable from the UI
Mode O/P LED
Operation Advanced Conf—P.18
Trip source 0 = Rated kW
1 = Current
N/A 0 Settable from the UI
Mode O/P LED
Operation Advanced Conf—P.19
Parameter Set Point Range Step Default Notes
Trip threshold OFF, 1–100%
imbalance
1% 20% Settable from the UI
Mode O/P LED
Protection Current unbal %
Trip delay 1–20 seconds 1 5 seconds Settable from the UI
Mode O/P LED
Operation Advanced Conf—P.16
Parameter Set Point Range Step Default Notes
Trip threshold OFF, ON N/A ON Settable from the UI
Mode O/P LED
Protection Phase loss
Trip delay N/A N/A N/A N/A
www.comoso.com
To Next Page
Loading...
