Stray Voltage Monitor

Specifications: Magazine Loader Battery: Fits Eveready 9 volt – lasts 70-80 hours on time Power Pack: Input 230–240 V ac adapter 12V dc 250m/a DKE part number for power pack: PLUGPA-0120250 Terminals: No polarity Leads and clips Cu: small Gal: medium and large Performance: Low voltage indicator Monitors and displays voltage across the terminals from 0 – 2 volt Operation: There are three modes: 1. With Power Pack only 2. With Power Pack and battery 3. With battery only Mode 1: No Battery The Power Pack (240V transformer) can be turned on and off via a 240V relay and automatically reset and start the SVI-1 at each milking. The operator can check for the maximum volts after milking, before power to the Power Pack is turned off by the relay. Mode 2: Power Pack and battery Power via the relay will reset and start the SVI-1: The battery will save the last reading, that can be retrieved by pushing the button. Following this all lights can be turned off by holding the button down for 6 seconds. With a battery installed the unit will flash the last reading when the Power Pack starts up the SVI-1. The operator will have to push the button to delete this and reset the SVI-1 for the new milking. Mode 3: Battery only • Press CLEAR / ON button to START. • GREEN light will flash if no volts. • GREEN light will turn off after 2 hours. • RED light will flash if voltage present. • If more than 2 volts are present, >2V light will flash. • Press CLEAR / ON button after the 2 hour shut down period. • The SVI–1 will display the maximum voltage from the previous recording period. • The previous reading can be cleared and the unit reset by pressing the CLEAR/ON button for more than 2 seconds. Installation: Fixed or Permanent • One terminal should be connected to anything that is electrically connected to the main earth spike. • The second terminal should be connected to another temporary earth spike at least six meters away from the main earth spike. • The SVI–1 will then measure the ac – dc Voltage or current flowing through the earth from one earth spike to the other. This installation method is the one recommended for permanent monitoring. Any change in the neutral line back to the transformer caused by poor connectors, dislocation, or change in resistance will cause more current to go back to the transformer via the ground. This will show as a higher voltage on the SVI–1. Use as a Mobile Instrument: The SVI–1 can also be used to detect voltage differences between the pipe work in the cow shed. The red light will flash the voltage level. If the CLEAR/ON button is pressed for more than 2 seconds the unit will reset to flashing green if one of the terminals is taken off the pipe-work. Reconnecting the terminal will display the voltage between any of the points. The Cause of the Problem: Transformer Neutral Line Please read the KK Automilker Infolink 7 to interpret the voltage levels that are likely to affect the behaviour and productivity of milking cows. The SVI–1 doesn’t display voltage above 2 Volts, as any voltage above 2 Volts indicates that enough is wrong to justify calling in your electrician in the first instance. A reading above 2 Volts indicates that the resistance or impedance from one end of the neutral wire to the transformer is too high for the unbalanced three phase loads. This is checked by your electrician using an instrument called Earth/Neutral Impedance Tester. The neutral impedance should be as low as possible. There is no legal value for this. A practical level is <10W. The earth bonding connections should be less than 1W using the Impedance Tester. This applies to the switchboard to earth peg connection, and all wires bonded to metalwork, including the earthing of the water heaters. This test should be carried out before the Power Supply Company is called. Sometimes the only solution to the problem is a dedicated transformer for the farm dairy with the shortest possible neutral line. Electric Fence Currents and Earthing Networks If the farm dairy is between an electric fence short and it’s earth spike, this can also affect the cows. This includes the neighbour’s electric fence energisers. Ground currents will always flow to the best earth. The KKUT10 Instrument has been designed to better detect and display electric fence voltages.