OWON PC321

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 27 values from it, listed under Interface.

Connect it with

• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Specifications

The PC321 is a wall-mounted meter, 86 × 86 × 37 mm, with an AC input cable and three current transformer (CT) cables. The input cable powers the unit and gives it the voltage of each phase; the split-core clamps open to fit around a conductor, so nothing has to be disconnected to measure a load. It reports RMS voltage and current, active and reactive power, and active and reactive energy for each clamp and in total.^1, 3

Power

Mains. 100 to 240 V AC through its AC input cable, less than 1 W.¹

Accuracy

Within ±2 W at or below 100 W, within ±2 % above 100 W¹

Measured values

Irms, Vrms, active power and energy, reactive power and energy¹

Clamp ratings and openings

80 A, 10 mm (standard); 120 A, 16 mm; 200 A, 20 mm; 300 A, 24 mm¹

Reporting

Every 10 s at most when power changes by 1 % or more, at least every 1 min¹

Wireless

Zigbee 3.0, 2.4 GHz IEEE 802.15.4, up to +19 dBm¹

Range

100 m outdoors, 30 m indoors¹

Antenna

Internal, with an optional external antenna¹

Operating environment

-20 to 55 °C, up to 90 % RH non-condensing¹

Dimensions

86 × 86 × 37 mm¹

Weight

415 g¹

Mounting

Wall bracket with two screws²

Where it is used

• Three-phase incomers and sub-mains up to 300 A, where the clamps go on without an outage.

  Transformer and distribution board monitoring

• Large single loads such as chillers, compressors and air handling units, each with a clamp per phase.

  HVAC energy monitoring for commercial buildings

• Three separate single-phase circuits from one unit, for sub-metering by area or tenant.

  Tenant submetering and cost allocation

Interface

On the Zigbee network it joins as a router and extends the mesh for other devices.¹

Readings and settings, with units and ranges where OWON publishes them. R readable, W writable only.⁶

Per-phase values arrive as OWON manufacturer attributes on the metering cluster and are named _l1, _l2 and _l3 after the clamp. The totals without a suffix cover all three clamps.⁶

OWON’s earlier quick start guide lists the Zigbee Home Automation 1.2 profile; the current datasheet and quick start guide list Zigbee 3.0.^1, 3

Setup

1. Wire it with the supply isolated

   Switch off the main supply. Connect the AC input cable: red to L1, green to L2, brown to L3 and white to neutral. On a single-phase supply, follow OWON’s single-phase wiring diagram.²

2. Fit the clamps

   Join each CT cable to the meter and tighten its latch. Open each clamp around its conductor with the arrow pointing from P1 to P2 in the direction of current flow.²

3. Open pairing in Edge

   Switch the supply back on and, in Edge, open pairing on the Gateway’s Zigbee network.

4. Let it join

   A new meter flashes red when it is ready to join and joins by itself; the LED goes out once it has joined. If it does not flash red, hold the function button for 10 seconds until the LED flashes green three times.²

5. Check each clamp

   Confirm that Edge identifies it as OWON PC321 and compare each clamp’s current with a clamp meter. A clamp that reads zero under load is probably fitted against the arrow.²

Common questions

Does the PC321 need an OWON gateway to work with Edge?

No. The current PC321 is a Zigbee 3.0 device, so it joins the Zigbee radio on an EpiSensor Gateway directly and Edge reads it there.¹

Can it measure solar export?

No. A clamp fitted against the direction of current reads zero, so it only measures consumption in the direction of its arrow. Use a bidirectional meter for PV or battery export.²

How do I reset it or clear its energy totals?

Hold the function button for 10 seconds until the LED flashes green three times; the meter then flashes red, ready to join, and keeps its energy data. To clear the energy data, reset it twice with less than 10 seconds between the two resets.²

Is the Tuya version the same device?

Not necessarily. OWON sells the clamp in Tuya and MQTT versions, and the readings on this page apply to the model that reports itself as PC321. Check the model Edge shows when the meter joins.^4, 6