Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 108)

7-4 Diagnostics
1560E-UM050B-EN-P - June 2013
Fault Definitions
Table 7.B shows the fault definition for the SMC-Flex.
Table 7.B – Fault Definitions Ì
Fault Description
Line Loss The SMC-Flex can determine if a line connection has been lost, and will indicate this accordingly.
Shorted SCR Shorted SCRs will be detected and starting will be prohibited by the SMC-Flex.
Open Gate
Open gate indicates that an abnormal condition that causes faulty firing (e.g., open SCR gate or faulty gate
driver) has been sensed during the start sequence. The SMC-Flex controller will attempt to start the motor a
total of three times before the controller shuts down.
Power Pole PTC
Overtemperature
The power pole temperature in each phase is monitored. If the temperature rises above the predetermined
level, the unit will fault to protect the power pole. A reset can be performed once the temperature falls below
this level. This fault may also represent loss of gate driver power during gating.
Motor PTC
A motor PTC can be connected to terminals 23 and 24. If the PTC parameter is enabled and the PTC trips,
the SMC-Flex will trip and indicate a Motor PTC fault.
Open Bypass
Power Pole bypass contacts are monitored for proper operation. In the event of a contact failure, the
SMC-Flex will indicate an Open Bypass fault.
No Load The SMC-Flex can determine if a load connection has been lost, and No Load fault will be indicated.
Line Unbalance u
Voltage unbalance is detected by monitoring the three phase supply voltages. The formula used to calculate
the percentage voltage unbalance is as follows:
V
u
= 100 (V
d
/ V
a
)
V
u
: Percent voltage unbalance
V
d
: Maximum voltage deviation from the average voltage
V
a
: Average voltage
The controller will shut down when the calculated voltage unbalance reaches the user-programmed trip
percentages.
Overvoltage and
Undervoltage Protection u
Overvoltage and undervoltage protection are user-defined as a percentage of the programmed line voltage.
The SMC-Flex controller continuously monitors the three supply phases. The calculated average is then
compared to the programmed trip level.
Underload v
Underload protection is available for undercurrent monitoring. The controller will shut down when the motor
current drops below the trip level. This trip level, a percentage of the motor’s full load current rating, can be
programmed.
Overload Protection
Overload protection is enabled in the Motor Protection group by programming the:
• Overload class
• Overload reset
• Motor FLC
• Service factor
Refer to Chapter 5 for more information on Motor Protection.
Phase Reversal
Phase reversal is indicated when the incoming power to the SMC-Flex controller is in any sequence other
than ABC. This pre-start protective feature can be disabled.
Coms Loss
The SMC-Flex controller disables control through the serial communication port as the factory default. To
enable control, the Logic Mask found in the Communication programming group must be set to “4.” With
Series B human interface modules, this can also be accomplished by enabling control logic through the
Control Status programming group.
If a Bulletin 20-HIM Human interface module or Bulletin 1203 communication module is disconnected from
the SMC-Flex controller when control is enabled, a Comm Fault will occur.
Network
Network faults are faults generated on the network external to the SMC-Flex, and are annunciated on the
LCD display.
Ground Fault
Ground faults are based on feedback from the user supplied 825 CT detecting ground fault currents. Ground
fault parameters of level and time delay must be programmed for proper operation.
Excess Starts/Hour
Excess starts/hour is displayed when the number of starts in a one hour period exceeds the value
programmed.
Power Loss
Power loss indicates that an input power phase is not present. The controller’s LCD display will identify the
missing phase.
If all three phases are absent when a start command is issued, the LCD will display “Starting” without motor rotation.
u Phase loss, overvoltage and undervoltage protection are disabled during braking operation.
v Jam detection and underload protection are disabled during slow speed and braking operation.
Ì Additional details regarding fault definitions can be found in Chapter 1 – Product Overview.