78 S611 Soft Starter MN03902011E—May 2012 www.eaton.com
S611 Fault Codes, continued
Code Fault Condition Solution
15 Power Pole Over Temperature • SCR temperature is above limits
• Operating environment above specified
maximum temperature
• Ventilation holes blocked
• Fans are not operational
• Starts/hour exceed specifications
• Sensor failure on power pole
• Bypass contactor(s) failed to close
• Ventilate to specified maximum temperatures
• Clear obstructions
• Verify fans are operational
• Verify system is not exceeding the specified
maximum starts per hour
• Verify bypass contacts are closing at the end of ramp
time
• Reduce excessive cabinet temperature
Note:
Any power pole temperature in excess of 100°C will cause a fault trip. Observe the temperature values in the UI display to verify that they make sense
for the application and that they are reasonably close to each other. If one value is significantly higher than the others, the sensor on the power pole may
be suspect. A value significantly lower than the others would indicate a damaged and/or open sensor lead. Note: If the temperature values observed in
the UI display are all significantly higher than normal, they are very likely indicating an actual over heating condition on the power poles and/or the
starter in general.
The soft starter will attempt to close the bypass contactors at the end of the ramp time, or if the motor is up to synchronous speed for 30 seconds. If the
bypass contactors close, then open, then close, and so on, several times, the contactor(s) may be failing to seal electrically. A common report of this
condition is “chattering” of the soft starter. After the 30 second time period, the unit will discontinue attempting to close the bypass contactors and will
continue to run on the SCRs. At some point in the future, the unit will very likely overheat due to insufficient cooling of the power poles.
Running continuously on the SCRs will generate more heat than can be dissipated by the internal fans, resulting in an over temperature fault trip.
16 Bypass Failure • Internal bypass contactor(s) not closed
and/or electrically sealed after ramp time
• Contactor(s) opened in bypass
• Verify all bypass contactor(s) close (audible noise)
• Verify all bypass contactor(s) not opening during run
cycle due to excessive vibration and/or shock
Reduce levels of vibration and/or shock
• Verify control power and wire size meet
specifications
• Verify that the control power supply meets the
120 Vac voltage and current requirements of the soft
starter
Note:
This fault may occur even if just one contactor (larger soft starters have multiple contactors) fails to seal electrically, of if the contactors opens during
operation. If the firmware detects that the bypass contactor(s) have failed to close (as measured by the voltage drop across the power poles), the
firmware will command the contactors to release (open) and then reapply the signal to the coil of the contactor(s). This process may repeat for
30 seconds. If after 30 seconds, and the bypass contactor(s) have failed to close electrically, the firmware will discontinue the signal to close the
contactor(s) and the soft starter will run using the SCRs. Bypass contactors may open during the motor run from excessive shock or 120 Vac control
voltage sag (insufficient voltage and/or current to maintain contact closure).
17 SCR Not Firing • SCR is not conducting when gated
Incoming phase lost
• Special application—undersized or high
impedance motor
• Load disconnected
• SCR failure
• Re-apply lost phase
• Review S611 application
• Circuitry damaged by megger testing
• Contact EatonCare for service
Note:
Verify that both mains and load lines are connected and secure. Verify that any isolation and/or reversing contactors are properly engaged prior to the
soft starter receiving a START command. If the current draw is significantly less than the frame size of the soft starter (less than 1/16 of motor FLA), not
enough current may be flowing to allow the SCRs to fire. If this fault occurs immediately when the START command is issued, isolation contactors may
be open and/or in transition. This feature may be disabled (not recommended).
18 Shorted SCR • SCR is shorted
• Internal bypass contactor welded shut
• No load on the SCRs when START
command is issued
• Test resistance of each phase
• Contact EatonCare for service
Note:
Shorted SCRs are the most common mode of SCR failure. With power completely removed from the unit, measure the resistance of each pole, line to
load. If the resistance is near zero (less than 5 ohms), it is most likely that the SCR is shorted. Resistance of a serviceable SCR is approximately 10k ohms.
Resistance typically moves to a lower value as the SCR ages. This feature may be disabled (not recommended).
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