Video: Shark 200 – Technical guide

Video transcript

How the Shark 200 goes into the panel: mounting, current and voltage wiring for wye systems, the power supply, RS-485 and an analogue output card, and the settings that make its readings correct. CT and PT circuits can carry lethal voltages and currents, so only qualified staff install it, with gloves, glasses and protective clothing. The meter is secondary protection only, never primary. And no dielectric test on its inputs, outputs or communication terminals. For an ANSI cut-out, 4 threaded rods go into the back,

then the gasket, and a lock washer and nut on each rod. For DIN, remove the studs and snap two brackets into the grooves, with a number 8 screw each. Never over-tighten: 0.4 newton metres at most. At the back: the current inputs, with high terminals on top and low terminals below. The terminal strip carries earth and power supply, then V ref and the 3 voltage inputs. In the middle, the two option slots, and on the right, the RS-485 and KYZ connector.

The CT leads can land on the studs with an O or U lug, at one newton metre at most. Or the studs come off and the wire passes straight through, up to 4.5 millimetres. Or quick-connect crimp terminals. In every case, keep the CT polarity. Voltage wires from 0.13 to 3.31 square millimetres, each one through a 0.1 amp fuse. The supply goes through a 3 amp slow-blow fuse, and the earth terminal straight to the protective earth, with 2.5 square millimetres. The most common case: a three-phase, four-wire wye with direct voltage and 3 C Ts.

Earth first. Then each CT, through the shorting block, polarity side to HI and return to LO. Then the 3 phase voltages through their fuses, the neutral to V ref, and the supply last. Where phase B voltage is not available, the two and a half element wye measures it without a wire. The 3 C Ts are wired exactly as before. Only phases A and C and the neutral come in,

and at the terminal strip V b is bridged to V ref. Each service has its setting on the meter, and it must match the wiring or every reading is wrong. With P Ts the wiring is the same, but the voltages come from the PT secondaries. In a three-wire delta, two C Ts are enough: their returns go through the B input. From the front: MENU, down arrow to CFG and ENTER. Set the CT numerator and scale, the PT numerator,

denominator and scale, and the hookup. Then address, baud rate and protocol. MENU twice, store all, and the meter resets. If it asks for a password, it is in the manual: change it. The ratios go in as numerator and scale. 2000 to 5 amps is simply 2000. 10000 to 5 is 1000, scale 10. 14400 to 120 volts is 14 40, over 1 20, scale 10. RS-485 is a two-wire, half duplex bus.

From the converter to the first meter: plus to plus, minus to minus, and the shield. Then from meter to meter, in a chain, never in a star. Each meter needs its own address before the bus is closed. Use shielded twisted pair, earthed at one point. No more than two cables on any terminal, and long lines may need termination resistors at both ends. If the settings are lost, for the first 10 seconds after power-up

the meter always answers at address 1, 57600 baud, Modbus RTU. Option cards go in with the meter disconnected. Unplug the voltage and supply terminals, remove the slot cover, and slide the card along its guide track until it clicks. Card one, card two, then the terminal blocks and the RS-485 plug, in that order. The 4 to 20 milliamp card is loop powered from outside. The loop supply feeds each load, for example an RTU input, each load returns to its output channel, and the common goes back to the supply minus.

Up to 850 ohms at 24 volts. With the software of the PC, connect through the RS-485 converter and open the device profile. Check the CT and PT ratios and the hookup, then the ports. Set the clock, which comes on Eastern time, give the meter a name, and send the profile. The meter reboots with the new settings. To check the installation, the load bar shows current against full load:

one segment from one percent, 10 segments at 120%, and all flashing above that. For accuracy, the watt-hour pulse gates a field test standard. Power network analysers, from Amperis.