80 S611 Soft Starter MN03902011E—May 2012 www.eaton.com
S611 Fault Codes, continued
Code Fault Condition Solution
25 Start Stall • Motor not at rated RPM at end of start
ramp time and/or current is in excess of
trip threshold
• Bypass contactors not closed at the end
of the start time (start current low/ramp
time short)
• Lengthen Soft Start Time and/or increase Initial
Torque in the Operations mode
• Increase trip threshold
• Loads that are heavily loaded (high inertia) during a
start such as fans will often need an initial torque
setting much greater than the factory default
• Set Kick Start parameters
Note:
Motor RPM is monitored for a synchronous speed condition when the start ramp time expires. A motor stall fault will occur at the end of the ramp time
(default is 20 seconds) if the motor is not at synchronous speed and the current is in excess of the trip threshold. Stall trip threshold range is 150–300%
(default 200%) of motor FLA setting. Verify that the motor is properly sized for the load.
27 SCR Overcurrent • Excessive SCR current during the start
ramp
• Only active when Stall Fault is disabled
• Increase Soft Start Time and/or Initial Torque
parameters in Operation mode
• Reduce starting load
• Verify S611 is properly rated for current
Note:
The maximum rms value of the three-phase currents is monitored. The current values observed in the UI display should be within ±5% of each other The
SCR overcurrent trip threshold is 3 x FLA at the end of the start ramp time and is not user settable.
28 Under Load • Loss of motor load
• Trip threshold set too high
• Excessive current fluctuation during
operation
• Inspect for failed motor coupling or pump cavitation
• Reduce trip threshold
• Increase trip delay time to ride through transient load
changes
Note:
When the bypass contactors are closed, the average value of the three-phase power as a percentage of rated power is monitored. Trip occurs when
the value falls below the trip threshold for the selected trip delay time. Trip threshold range is 1–50% (default Off) of rated power. Trip delay range
is 1–60 seconds (default 5 seconds). Rated kW = 33 x Motor Rated voltage x Motor FLA x 0.9 (power factor).
29 Current Unbalance • The current imbalance of the incoming
phases exceeds the trip threshold
• Correct imbalance problem with mains
• Increase the Current Imbalance parameters
• Disable the fault if the other issues cannot be
resolved
Note:
Current imbalance trip threshold range is 1–100% (default 20%). Current imbalance trip delay range is 0–20 seconds (default is 5 seconds).
This feature may be disabled (not recommended).
30 Current Phase Loss • Incoming phase disconnected
• Open fuse or breaker
• Phase imbalance exceeds specifications
or trip parameter
• Severe voltage phase imbalance
• Repair broken connection
• Replace fuse
• Inspect system for phase imbalance conditions
Note:
Phase loss is a severe condition of phase imbalance, even momentarily. In cases of severe imbalance causing nuisance trips, this feature may be
disabled (not recommended). Prior to disabling this protection, adjust the Phase Loss % trip parameter value (default is 80%) to see if it will improve the
condition. Adjusting the Phase Loss Delay (default is 0.5 seconds) may also improve performance in cases where phase instability is a problem. Phase
performance should be monitored for an appropriate length of time to ensure that the phase is not dropping just long enough for the soft starter to detect
the condition.
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