Installing WB-MAP multi-channel energy meters in a cabinet

Installing and commissioning the meter is labour-intensive. Follow our recommendations and save time!

Preparing for installation

Be sure to connect the PE terminal to protective earth and the N terminal to neutral.

We recommend switching off the cabinet power before installation. If the cabinet stays energised during installation, the person doing the wiring must hold the appropriate electrical safety clearance level.

1. Mark the incoming phases with the stickers — L1, L2, L3 (supplied).
2. For every breaker whose power will be measured, identify the phase, visually or by continuity testing. And if the cabinet is not switched off, use a voltmeter: the voltage between the same phase at the input and at the breaker will be about 0 V, and between different phases 400 V (AC).
3. Mark the breakers with the coloured phase-number stickers.
4. To connect voltage to the meter you can:
   • Use spare breakers in the cabinet, if there are any.
   • Add extra breakers off the input, if there is room.
   • "Piggyback" onto an occupied breaker. Do not use breakers feeding critical equipment! Be careful: two wires of different diameter will not hold in one terminal block! Crimp the pair of wires into a twin ferrule, or use a flat blade connector — it can be slipped in under the wire and will hold.
5. Mark the breakers/voltage wires for the meter.
6. Mount the MAP meter in a free spot on the DIN rail.

Connect protective earth (PE), neutral N and the phase voltages L1, L2, L3 to the meter according to your marking.

• 
  Phase marking at the cabinet input
• 
  Phase marking on the breakers
• 
  Connecting the meter to a spare breaker. Different wire colours are used for different phases.

Installing the current transformers

Connecting low-voltage power and the RS-485 bus to the meter

• Fit the transformers onto the phase wire with the arrow on the housing pointing towards the load
• For split-core transformers:
  • Before snapping the core shut, clean its surfaces of dust and fingerprints with the cleaning wipes
  • The transformer must rotate freely on the wire. Forcing it apart from the inside, skewing it and the like are not allowed
• Measure the wire length you need from the transformers to the meter, shorten (or extend) it and strip the ends. If there is enough room in the cabinet the wires need not be shortened — bundle them with a tie
• The ends of the stranded current-transformer wires should be terminated in insulated bootlace ferrules (НШВИ, IET Regulation 526.9)
• The wires can be extended up to 50 metres, provided the total resistance stays below the value given in the meter documentation. Do not split the wires, route them as a twisted pair. We recommend КГВЭВ 7х1,0 or similar — a single cable extends all three transformers of one three-phase load at once. Insulate the joint

8. Connect the transformers to the meter:

• A three-phase load — to one channel of the meter
• Keep the number and the phase matched: 1 — L1, 2 — L2, 3 — L3
• Black wires to the "minus" of the meter inputs, and the coloured one (white, red) — to the "plus"
• If the transformer parameters were entered into the meter beforehand — do not mix up the connection order, they are now tied to their own inputs

9. Connect the RS-485 bus to inputs A and B and the common ground to GND (for a reliable link the "grounds" of the devices on the bus must also be connected). Apply power to V+ (required for the interface part to work).

• 
  Current transformer marking (channel 2, phase L1 (A))
• 
  Connecting the current transformers
• 
  Connecting the current transformer leads
• 
  The transformer must rotate freely on the wire, fixed with the arrow on the housing pointing from the breaker towards the load

Commissioning

1. Enter the transformer parameters into the meter memory.

2. Check that the wiring is correct:

a. Load the phases — a power of about 100 W is enough.

b. In the controller interface look at:

- the values of the angles between current and voltage (usually from -40 to +40).

- the active power on the phase (positive).

Indication

Status (green) - blinks during Modbus data exchange, and is lit continuously when power is present.

CF1...CF4 — yellow (red in some revisions) indicators of the total energy consumed for each three-phase channel. 1000 pulses correspond to 1 kW·h, that is, blinking once a second means 3.6 kW.