ABB DDI01 Freelance 2000 programmable analog input and output unit
2.4.1.2 InterferenceFor immunity to interference, the load cell cables should be separated as far as possible from
noisy power supply cables. A minimum distance of 0.3 m (12 inches) is recommended. Where
the measuring system cables meet noisy cables, they must cross at right angles.
2.4.1.3 Synchronization
Synchronization is not required for the wall mounted IP 65-version (NEMA 4) of the tension
electronics.
If two or more IP 20-version (unsealed) tension electronics are mounted in the same cabinet
they must be synchronized.
Synchronization is done by interconnecting the "SYNC" terminals, screw terminal X1:14, of all
the units and interconnecting screw terminal X:15 of all units. A twisted pair cable or a screened
cable must be used.
If one unit is turned off or removed the remaining units are still synchronized
2.4.2 Mounting the Tension Electronics PFEA111/112
2.4.2.1 IP 65-version (NEMA 4)
The electronic unit is delivered in an enclosure intended for wall mounting.
When choosing a place for installation, check that there will be space to open the enclosure lid
fully. Also check that there is enough working space in front of the enclosure.
The enclosure is fitted with cable glands (PFEA 111 five and PFEA 112 six cable glands).
Figure 2-4. Installation Dimensions for PFEA 111/112
1 x for cable 6-12 [0.24”-0.47”]
Enclosure threaded for NPT-1/2”
2 x for cable 6-12 [0.24”-0.47”]
2 x for cable 4-8 [0.16”-0.31”]
Note.To fulfill UL-requirements, the cable
gland for mains supply cable must be
replaced with an UL-listed metal fitting.

Connect the cables to terminals according cable diagrams in Appendix (B, C, D, E, F or G)
depending on installed load cell type.
NOTE
Do not connect solid conductors to terminals. Do not crimp pins to stranded
cores.
NOTE
The incoming mains voltage must be provided with fuses and a means of
disconnection outside the tension electronics.
Figure 2-6. Installation Dimensions
Connect the cables to terminals according cable diagrams in Appendix (B, C, D, E, F or G)
depending on installed load cell type.
NOTE
Do not connect solid conductors to terminals. Do not crimp pins to stranded
cores.
Earthing
The metal bottom of PFEA111-20 and PFEA112-20 connects to the metallic DIN-rail which
serves as the Tension Electronics earth connector.
This is to ensure a good earth connection both for internal logic and for the EMI immunity
and RF emission of the electronics.
The DIN-rail must have a good connection to the PE (Protective Earth) of the cabinet.
To achieve the best possible corrosion resistance, DIN-rails should be chromium plated, for
instance, yellow chromium treated. Use star washers with each screw used to fasten the
DIN-rail to the mounting plate.
To fasten the DIN-rail onto the mounting plate, the minimum screw diameter is 5 mm and
the maximum distance between screws is 100 mm.