42 ESP program features
Backspin supervision
Backspin supervision set of functions can be used to monitor the status of pump-
motor shaft after production operation is interrupted. The function prevents undesired
premature restart of the pump before fluid column is sufficiently drained.
Restart delay
The Restart delay function prevents any new start command for a period of time set in
parameter 74.21 Restart delay time after stop command is initiated. The function
prevents accidental pump restart at least for the given amount of time. It is always
recommended to enable restart delay and keep it active for several minutes even if
the backspin speed observer function is enabled.
Backspin speed observer
Backspin speed observer function can be used to monitor the actual speed of the
motor in real time, in case spinning passively due to fluid column drainage down
through the pump.
The drive must be in stopped state during backspin speed observer operation. When
enabled, it will automatically activate motor speed supervision after Restart delay
time is elapsed. The function will ignore the user start command and prevent drive
normal operation until passive motor speed reduces down to speed region defined as
safe to restart.
Note: When Restart delay is active, the Backspin speed observer function cannot
show motor speed estimate unless requested by the user Drive start command.
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