Trip Auto-Reset Function
NOTE: The Auto-Reset function may lead to immediate energizing of the load, with an active command from the PLC or the Force mode function.
 WARNING |
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UNINTENDED EQUIPMENT OPERATION
Configure this function in a such a way that it does not
result in unsafe conditions.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
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The Automatic Reset function triggers trip reset commands automatically, without the intervention of a human operator. This function can be configured separately for each Thermal group, Electrical group, and Load group of protection functions of a TeSys™ avatar.
The following table defines the Auto-Reset groups.
Auto-reset groups
|
Auto-reset group |
Protection trip cause |
|---|---|
|
Load Protection |
Jam |
|
Long Start |
|
|
Stall |
|
|
Undercurrent |
|
|
Overcurrent |
|
|
Thermal Protection |
Thermal Overload |
|
Motor Overheat |
|
|
Electrical Protection |
Phase Configuration |
|
Current Phase Unbalance |
|
|
Current Phase Loss |
|
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Ground Current Detection |
|
|
Current Phase Reversal |
For each group, you can configure the following:
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A delay before a reset attempt
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Functionality to repeat reset attempts
The Auto-Reset function ultimately works as the Trip Reset command: the tripped protection functions are reset only if their trip reset conditions are met.
Two parameters can be configured for each group of protection functions.
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The Auto-Reset Timer is a delay between the moment a protection function detects the presence of trip conditions (and triggers a trip), and the first auto-reset attempt. The actual reset can occur only after the delay elapses and the trip reset conditions are met. For instance, if the delay is set to 60 s and it takes 70 s for the system to meet the trip reset conditions, then the reset occurs after 70 s (that is, the shortest duration that satisfies both rules). If it only takes 50 s to meet the trip reset conditions, then the delay still applies and the reset occurs after 60 s.
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The Auto-Reset Retry Attempt Maximum specifies the number of reset attempts made if the previous ones are unsuccessful (for instance, if the external conditions causing the trip to occur still exist.). If the Auto-Reset Retry Attempt Maximum parameter is set to A, the reset attempts are repeated indefinitely until the reset is successful. Otherwise, only the specified number of resets is attempted.
These parameters apply to each protection function within the group. If multiple protection functions are tripped within a given group, then the delay, the criteria of the trip reset conditions, and the retry attempt maximum setting apply to all the tripped functions of that group. For example, if both the Stall and Long Start protection functions are tripped, the Auto-Reset triggers a trip reset only after the delay set for the Load Protection group elapses, and the trip reset conditions are met for both protection functions.
The Group Auto-Reset Retry counter increments for each retry attempt. It is reset to zero one minute after a successful trip reset (in the absence of further trips).
The following table describes Auto-Reset parameters.
Auto-reset parameters
|
Setting name |
Description |
Value range |
Units |
Default value |
Increment |
|
|---|---|---|---|---|---|---|
|
Load Protection |
Auto-Reset Retry Attempt Maximum |
Parameter to limit Auto-Reset operations |
0–10 (A) |
— |
0 |
1 |
|
Auto-Reset Timer |
Timer to trigger Auto-Reset |
0–65,535 |
s |
60 |
1 |
|
|
Thermal Protection |
Auto-Reset Retry Attempt Maximum |
Parameter to limit Auto-Reset operations |
0–10 (A) |
— |
A |
1 |
|
Auto-Reset Timer |
Timer to trigger Auto-Reset |
0–65,535 |
s |
480 |
1 |
|
|
Electrical Protection |
Auto-Reset Retry Attempt Maximum |
Parameter to limit Auto-Reset operations |
0–10 (A) |
— |
0 |
1 |
|
Auto-Reset Timer |
Timer to trigger Auto-Reset |
0–65,535 |
s |
1,200 |
1 |
|