energy management - PLC Programming & Automation

PLC Sustainable Manufacturing: Measure, Then Shut Off

Timing chart of idle shutdown and staggered restart: part flow stops, the idle timer completes five minutes later, the conveyor, vacuum generator and extraction fan switch off in sequence, and when parts return the fan starts first, then the vacuum, then the conveyor

Meter energy, air, water and scrap per part, write idle shutdown in Structured Text, stagger the restart, and report numbers that survive an audit.

Predicting the Demand Peak and Shedding Load from the PLC

by PLC

Ladder rung for load shedding: predicted demand high in parallel with the shed seal-in bit, in series with the shed permit and the chiller alarm contact, driving the shed output for chiller 2

Wire a power meter into Logix or S7, totalize kWh in Structured Text, hold the demand peak with priority load shedding, and check if a VFD retrofit pays.

Generator Start Permissives, Sync Handover and Load Shed

by PLC

Ladder rung for a generator start permissive: start push button sealed in, lube oil pressure healthy, generator breaker open, lockout relay reset, driving the start sequence coil

Where the PLC stops and the relay starts, a generator start permissive rung, the synchronising handshake, load shed stages and switchgear interlocks.