54 S611 Soft Starter MN03902011E—May 2012 www.eaton.com
Motor Phase Reversal
The S611 monitors the phase voltages to determine the incoming phase sequence (ABC or
ACB). If the monitored sequence differs from the trip setpoint setting, a motor phase reversal
fault is issued. The phase reversal trip will need to be disabled when using an upstream
reverser.
Motor Phase Reversal Settings
Voltage Phase Imbalance
The S611 monitors the voltage imbalance when the motor is off and checks the value just
prior to starting to determine if a fault shall be issued and the start will be terminated. When
the bypass contactors are engaged, the S611 monitors the voltage imbalance and issues a
voltage imbalance fault if the measured value exceeds the threshold for the trip delay time.
Note that the S611 will not generate a voltage imbalance fault when the motor is starting.
Voltage Phase Imbalance Settings
Under Voltage
The S611 monitors the minimum rms voltage and checks the value just prior to starting to
determine if a fault shall be issued and the start terminated. When the bypass contactors are
engaged, the S611 monitors the minimum rms voltage and issues an under voltage fault if the
measured value drops below the threshold for the trip delay time. Note that the S611 will not
generate an under voltage fault when the motor is starting.
Under Voltage Settings
Parameter Set Point Range Step Default Notes
Trip threshold OFF (0)
ABC (1)
ACB (2)
N/A ABC (1) Settable from the UI
Mode O/P LED
Protection Phase sequence
Trip delay N/A N/A N/A N/A
Parameter Set Point Range Step Default Notes
Trip threshold OFF, 1–20%
imbalance
1% 6% Settable from the UI
Mode O/P LED
Protection Voltage unbal %
Trip delay 1–60 seconds 1 10 seconds Settable from the UI
Mode O/P LED
Operation Advanced Conf—P.22
Parameter Set Point Range Step Default Notes
Trip threshold OFF, 1–99%
rated voltage
1% 90% Settable from the UI
Mode O/P LED
Protection Under voltage %
Trip delay 1–60 seconds 1 10 seconds Settable from the UI
Mode O/P LED
Operation Advanced Conf—P.20
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