A dead capacitor step doesn't trip anything. It just costs you
Gin power factor correction is easy to assume and hard to see. A bank of capacitor steps in the switchroom cancels the reactive current from the gin stand, fan and press motors.
When a step drops out, no alarm sounds. Ergon Energy Retail says sites with a power factor near 1 pay less on a kVA tariff, and less efficient sites pay more.
The first you hear is the invoice, weeks later. And it says kVA, not which step is dead.
- A blown fuse or stuck contactor trips nothing.
- The controller can still show the step as on.
How gin power factor correction monitoring works, switchroom to roof
- 1
A sensor on every step
A split-core current sensor clips on one phase of each capacitor step inside the panel. Our electricians fit it.
- 2
Radio to the roof
Each sensor sends a small reading every few minutes by LoRaWAN radio to a gateway mounted high, clear of the steel shed.
- 3
The rules check each step
A step the controller has switched on but that draws under about half its expected current is flagged by number.
- 4
A text to your people
The gateway sends out by Starlink or 4G. The SMS and email go to the people you name.
-
9:42 am
Gin PFC step 3 still under 10 A after 45 min. Sent to all nominated people.
-
2:30 pm
Gin PFC step 3 back to 34 A. Bank normal, 4 of 4 steps delivering.
What your phone shows when a step quits
-
9:12 am
Gin PFC step 3 on but drawing 3 A, expected 35 A for 15 min. Check fuse and contactor.
-
9:42 am
Gin PFC step 3 still under 10 A after 45 min. Sent to all nominated people.
-
2:30 pm
Gin PFC step 3 back to 34 A. Bank normal, 4 of 4 steps delivering.
Step 3 current, 25 kvar at 415 V
Dashboard view
- Step 1
- 35 A
- Step 2
- 34 A
- Step 3
- 3 A
- Step 4
- 35 A
What we fit in the switchroom and on the roof
-
Step current sensor
Clips on one phase of each capacitor step and shows whether it's drawing current.
One per step
-
Controller alarm input
Reads the controller's alarm relay and its heartbeat.
Alert after 10 min
-
Incomer power monitor
Reads kW, kVA and power factor at the main switchboard.
Reads every 5 to 15 min
-
Roof gateway
Collects every sensor by radio, mounted high clear of the steel.
Starlink or 4G out
A step dies in January. When do you find out?
Without monitoring
- JanuaryA fuse blows on step 3. The gin is shut.
- MarchStart-up. The bank runs short at full load.
- AprilThe first big invoice lands with a high kVA.
With monitoring
- JanuaryStep 3 reads under half its current. Text sent.
- FebruaryFuse replaced in the shutdown. Bank tested.
- MarchStart-up with all four steps working.
Today versus with step monitoring
| Topic | Today | With monitoring |
|---|---|---|
| Finding a dead step | At a shutdown inspection, or on the invoice | A text the day the step stops delivering |
| Which step | Open the panel and check each one | The text names the step number |
| Controller alarm | Often wired to nothing | Alarm relay sends a text after 10 minutes |
On a gin, mill or grain site
Gins run roughly late March to August or September. The bank has to be healthy on day one. A step that fails in the off-season is the worst case, because nobody's looking.
A mill that generates its own power needs its tariff checked before anyone counts on a kVA saving.
Next, see cotton gin demand charges and cotton gin energy monitoring. For heat in the same room, see sugar mill switchboard fire and the mill transformer temperature alarm.
What it costs
We set a fixed price after a short scoping call or a site visit. It depends on how many steps and motor control centres, how far to the gateway, and how it gets out. Ongoing support is available as a plan after handover.
Get a quote for bank monitoringThe fixed price covers
- A current sensor on each capacitor step, plus the controller alarm input
- Gateway and Starlink or 4G backhaul
- Installation and electrical work under QLD Electrical Contractor Licence 1513082
- Alert set-up for each step, and a test text to your phones
- Ongoing support: keeping it running, fixing faults and tuning thresholds after your first full ginning period
What this won't do
- It doesn't control the bank. The controller keeps switching steps, and shutdown inspection and thermal imaging are still worth doing.
- Current on one phase won't show every capacitor fault. A partly failed capacitor can still draw some current.
- Readings come every few minutes, not live, and they stop outside gateway range.
- It's not a safety or fire system. It sits alongside your protection and fire systems.