Published: 07/13/2004
| Question: | When the E7 drive trips out on a fault it must be manually reset. Can the E7 be set to restart automatically after a fault? |
| Answer: | Yes, The E7 can be set to attempt restart automatically.
The following excerpt is taken from the TM.E7.02 E7 Programming Manual
For a more in-depth explanation and related parameters please refer to the E7 Programming manual pgs 109 and 110.
L5 Fault Restart
L5-01 Number of Auto Restart Attempts
Setting Range: 0 to 10
Factory Default: 0
L5-02 Auto Restart Operation Selection
L5-03 Maximum Restart Time After Fault
Setting Range: 0.5 to 600.0 Seconds
Factory Default: 180.0 Seconds
All major faults will cause the Drive to stop. For some faults it is possible to configure the Drive to attempt a restart automatically. After the fault occurs, the Drive baseblocks for L2-03 seconds. After the baseblock is removed the Drive checks if a fault condition still exists. If no fault condition exists the Drive will attempt to restart the motor. If the restart is successful,
the Drive performs a Speed Search (Regardless of the status of b3-01 “Speed Search Selection”) from the set speed command and the Auto Restart Attempts count is increased by one. Even if the restart fails the restart count is increased by one as long as the Drive attempted to rotate the motor. The restart count will not be incremented if the restart is not attempted due to a continuing fault condition, (i.e. an OV fault). The Drive waits L5-03 seconds before attempting another restart.
The auto restart count is reset back to 0 if any of the following occur:
• No further faults for ten minutes after the last retry.
• The Drives power is turned off (the Drive must be without power long enough to let control power dissipate).
• The SHIFT/RESET key is pushed after the last reset attempt.
The setting of parameter L5-02 determines whether the fault output (MA-MB) will be closed during an auto restart attempt.
The setting of L5-02 can be important when interfacing the Drive with other equipment.
The following faults will allow the Auto Restart function to initiate:
• OC (Overcurrent)
• LF (Output Open Phase)
• PF (Input Phase Loss)
• PUF (DC Bus Fuse)
• OL1 (Motor Overload)
• OL3 (Overtorque)
• OL2 (Drive Overload)
• OV (DC Bus Overvoltage)
• GF (Ground Fault)
• UV1 (DC Bus Undervoltage)
• OH1 (Overheat)
In order for auto restart after a UV1 fault, Momentary Power Loss Ride-thru must be enabled (L2-01= “1: PwrL Ride Thru t”, or “2: CPU Power Active”). Setting H2-01 or H2-02 equal to “1E” configures a digital output as “Restart Enabled” to signal if an impending auto restart is possible. |
Product Information:
| Product Group: | Inverters/Drives |
| Product: | E7 Drive |
| Applications: | |
| Category: | Operation; Parameters; Programming; Starting/Stopping; Troubleshooting |
Other Information:
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