5.8 Protection Group (PRT)
Protection features provided by the H2 Series inverter include both motor and inverter protections.
Motor Protection - Overload, Underload, Over Heat (ETH), Stall Prevention, etc.
Inverter Protection - Open Phase, Inverter Overload, Fan Fault, etc.
5.8.1 PRT-01 Backspin Timer
The Backspin Timer is used to prevent starting for a specified time. When the inverter stops (or
trips), the backspin timer prevents the inverter from starting into a back spinning load. For pumps,
the run signal is blocked for the time it takes for the remaining flow rate to discharge completely
when the net head of the pump is lower.
Backspin Timer Setting Details
When any value is set in PRT-01, a warning message will be displayed, and all start or
reset/restart signals will be ignored for the set time. The time is based on time after stop, not time
since start was issued.
• When [PRT-01 Backspin Time] is set as “0.0”, the function is deactivated.
• When output frequency reaches “0” after a stop command or trip, the inverter cannot run for the
[PRT-01 Backspin Time] and will display warning message of {Backspin Time}.
• If a start command is re-entered during deceleration, the inverter will operate immediately
without applying the [PRT-01 Backspin Time] time.
• After the [PRT-01 Backspin Time], the inverter will automatically restart according to the [Reset
Restart] setting values. Refer to below diagram.
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