Automatic Pump Restart After a Power Cut: What Should Resume?
Mohit VekariaShare
An automatic pump restart can remove the need to visit the starter when electricity returns. But first decide what should restart: any permitted pumping, a repeating cycle, or only the unused part of a daily runtime. These are different control rules.
Why a simple auto switch may not be enough
Suppose a garden needs a planned amount of pump running each day. Starting whenever supply returns does not, by itself, keep account of that daily target. The pump also needs a defined stop rule.
A SIM-controlled starter can be useful when someone needs remote commands or alerts. If the requirement is a local, repeatable routine, a compatible timer starter can operate without a SIM subscription. Removing connectivity also means the panel should not be assumed to provide remote status.
TPM-T: confirmed remaining-time behaviour
For TPM-T's daily-runtime function, Mohit Vekaria confirms that a power interruption does not require the full daily duration to start again: after power returns, the panel resumes the remaining daily time. Once that target is completed, it stops until the next day.
Illustrative example: with a 30-minute daily target, 10 minutes completed before an outage leaves 20 minutes to run after restoration, subject to the panel's operating and protection conditions. This is a timing example, not a watering recommendation.
Do not extend that confirmed sequence to BOM-T or another model without checking its documentation. Midnight rollover, missed days and the interaction with restricted clock windows also require their own confirmation.
Choose the panel for the required sequence
TPM-T is the three-phase clock/daily-runtime candidate for a compatible DOL motor. TPM-A suits a different requirement where cyclic operation is needed. For compatible single-phase borewell/openwell motors, BOM-T and BOM-G are the corresponding clock and cyclic candidates, but their precise outage recovery needs verification.
The motor, current range, starting method and actual model variant still determine compatibility. A clock function alone is not proof of daily-runtime memory.
Power restoration is not a cleared fault
A normal supply interruption and a protection trip are different events. Dry-run, overload or other faults may have documented lockouts or recovery conditions. Do not promise that a supply cycle resets them, or that a delayed restart proves water is available.
Before enabling Auto mode, have an installer test the intended recovery sequence and assess unattended-start hazards. Safe maintenance requires electrical isolation; a stopped pump may be waiting to restart.
When automatic restart is the wrong objective
If the process needs inspection before every start, use a control arrangement that respects that requirement. If the pump already has suitable local scheduling, another auto-start device may add no value. The useful outcome is a predictable sequence after an outage, with the required stop and interlocks still in force.
