Under the Meter Lid
2-11
and an event in the log when the switch is released by someone opening the terminal
cover.
Meter Lid Tamper Detect
The Mk10A meter has an optional switch that can detect the opening of the meter lid.
The meter can generate an EFA alarm and an event in the log when the switch is
released by someone opening the meter lid.
Under the Meter Lid
Removing the sealable screw allows the meter lid to be removed. Generally
connections to the I/O connectors do not need to be detached to allow the cover to be
removed. Removal of the meter lid is required to access the
Config Jumper
, and to add
or remove the CT to VT links on whole current meters with old style terminal blocks.
Care must be taken as dangerous voltages are present in the circuitry under the meter lid
while the meter is active. Most of the circuitry is at neutral potential.
Even when the meter is not powered, care should be taken to prevent electrostatic
damage to the circuitry of the meter.
CT to VT Links
Whole current meters have CT to VT links between TB2 terminals 1 and 2, 4 and 5, 8
and 9, 12 and 13 (designated number as shown in Figure 2-5). These links may need to
be removed to allow testing on some types of test bench. The old terminal block design
and the new design have different methods of connecting the links.
In the old design the links are under the meter lid, and require the meter seal to be
broken to access them. Figure 2-13 shows the location of the link for phase A (as
indicated in the circle), just above the terminal block. There is a link each for phases A,
B, C and Neutral, though the neutral link does not generally need to be removed.
To access to the CT-VT links, remove the lid cover and slide the CPU card upward to
expose the CT-VT link enough for access using screwdriver. Care must be taken on
ESD protection by wearing ESD wrist strap, or ensure that no component is touched.
ESD can damage certain components in the circuitry, so avoid touching components
other than the screws.
The Mk10 Meter 2-11
