42
IMS-MN-LMDE42C_A
Monitoring Functions
Liberty MDrive Ethernet TCP/IP
Equipotential Bonding Conductors
Potential differences can result in excessive currents on the cable shields. Use equipotential
bonding conductors to reduce currents on the cable shields. The equipotential bonding
conductor must be rated for the maximum current flowing. Practical experience has shown that
the following conductor cross sections can be used:
• AWG 5 (16 mm
2
) for equipotential bonding conductors up to a length of 650 ft (200 m)
• AWG 4 (20 mm
2
) for equipotential bonding conductors with a length of more than 650 ft
(200 m)
Protective Earth
The LMD should be earthed to a common system earth point. Multiple earth points within a
system may be at different potentials which can lead to recirculating currents (ground loops)
Mounting plate
tied to earth
Common system
earth point
Common system
earth point
Mounting plate
floating
Multiple system
earth points
Monitoring Functions
Monitoring functions can help to guard the system and reduce events that may result in
unintended equipment operation.
NOTE:
These monitoring functions should not be used for safety-related functions.
The following monitoring methods are available:
1.
Software
: Internal temperature, input/output states, and moving, as well as other device
conditions may be monitored using software via the service interface.
2.
Hardware:
Outputs and other device conditions may be monitored using signal outputs via
the multifunction interface.