Landis+Gyr E650 Series User Manual page 43

Installation and uninstallation

D000030108 en m – E650 Series 3 – ZMD300AT/CT – User Manual
2. Insert the phase connecting wires in the relevant terminals (the
terminals are numbered as shown in the connection diagram) and
tighten the terminal screws firmly (torque 3 to 5 Nm).
With small conductor cross-sections (e.g. 4 mm²) the connecting line
must be placed in the indentation (stamping) of the current loops, so
that it cannot shift sideways when tightening the terminal screws.
Ensure that the connecting line remains in the indentation when
tightening.
Indentation (stamping) for smaller connection lines
Current loop conductor
Figure 44. Cross-section through current loop conductor
If smaller connection lines are used, it's possible to adapt the cable
section with terminal holes using "assembling aids" or "centering parts"
in order to have a safe connection:

P000225650 (x100 pcs) – 8.5 mm

P000172980 (x100 pcs) – 9.5 mm
Please contact your sales representative for ordering.
It is recommended to identify the beginning and end of the relevant
conductors with a suitable test unit (e.g. buzzer) to ensure that the
right consumer is connected to the meter output.
Inputs and/or
output contacts of
extension board
U1 U2 U3
L1
Phase connections
Figure 45. Meter connections (example ZMD300xT)
Power losses at the terminals
Insufficiently tightened screws at the phase connections can lead to
increased power losses at the terminals and therefore to undesirable
heating. A contact resistance of 1 mΩ causes a power loss of 10 W at 100
A!
Pulse
inputs
N
L2 L3 N
Communication
interfaces
Communication unit
Control inputs and
output contacts
Voltage outputs
43/84
© Landis+Gyr