Anti-tamper Features Released
25/31
Cashpower Three Phase V11
– User Guide
© Gyr (Pty) Ltd
9
Anti-tamper Features
9.1
General
The Three Phase electronic circuitry is mechanically sealed at the time of manufacture by screw
sealing plugs. The use of these sealing plugs ensures that there are visible signs of tampering if
unauthorised entry to the meter is attempted
On installation, the Three Phase terminal cover is fitted to the meter with two terminal cover screws.
The screws are then sealed with utility-sealed wire seals. The use of the utility seal ensures that there
is a visible sign of tampering from the front of the meter.
9.2
Anti-Tamper Switch
The Three Phase meter is fitted with a mechanical anti-tamper facility.
The tamper facility automatically detects if the meter terminal cover is removed. This condition will set
the tamper state thereby causing the meter to disconnect power to the household
– it will remain in the
tampered state when the cover is re-fitted to the meter
The tamper detect function may be enabled or disabled during production, or by means of a Set
Options Register token. The tampered condition may be monitored by using the information functions
Figure 9: Three Phase Meter - Tamper Switch
9.3
Reverse Energy Detection
The metering circuitry can detect and measure reverse power. A filter ensures that short periods of
reverse power are ignored e.g. as a result of a motor running down and only
significant reverse power
detected. A
significant reverse power
condition will be flagged when there has been a continuous
reverse power measurement equivalent to 50Wh.
Under reverse power conditions, metering will continue as normal i.e. credit will continue to be
decremented.
