Operating Manual
Arc fa
ult protection ZŁ-4A; (07.2019)
35
Installation of bay/executive units in case the CAN bus length is over 250 meters.
Total length electrical connections of CAN bus should be less than 250 meters. At longer
lengths, interference or failure
of communication may occur. In ZŁ-4A systems with CAN bus
lengths greater than 250 m, a set of CAN/FO fiber optic converters must be installed. Total
length electrical connections to the converter terminals should be less than 250 meters. The
maximum length of fiber optic connections between converters is several kilometers (de-
pending on the converter type). Delays of the device tripping associated with these solutions
are negligible. An example of such a solution is shown in Fig. 17. Energotest provides
a suitable solution as an option for the entire protection system. The requirement of increas-
ing the length of the CAN bus should be notified to Energotest during ordering.
Optical elements mounting
During installation of the protection device it is important to pay particular attention to the
correct mounting of optic elements of the device, in particular:
conservation of safe bend radius for fiber optic,
arrangement of fiber optic in such places, where the damage during routine mainte-
nance work is highly unlikely,
keeping clear of moving parts of the switchgear: drives, pulling elements of interlocks,
limit switches etc.,
if possible, laying the fiber optics independently (apart from other conductors)
limiting the length of fiber optic into a frontal sensor (without applying spare fiber); the
maximum length of the fiber reserve is 1 meter.
The optic elements should be mounted with the use of plastic mounting strips and self-
adhesive grips according to the tips mentioned above. Transitions of optic elements into par-
ticular compartments of the protected switchgear should be sealed with the use of plastic
seals PG-7 for instance (13 mm diameter holes are necessary to use them).
Optical detectors with plastic fibers are connected to the optical inputs of bay units ac-
cording to what is presented in Fig. 15. The point sensor and the fiber optic loop are inter-
changeable. Properly cut fiber optic cable does not need any additional preparations or con-
nectors. Proper installation is ensured by the construction of the optical detector output of the
bay unit.
Summary of Contents for ZL-4A
Page 24: ...Operating Manual 24 Arc fault protection ZŁ 4A 07 2019 Fig 5 ZŁ 4A JC dimensions ...
Page 25: ...Operating Manual Arc fault protection ZŁ 4A 07 2019 25 Fig 6 ZŁ 4A JP dimensions ...
Page 26: ...Operating Manual 26 Arc fault protection ZŁ 4A 07 2019 Fig 7 ZŁ 4A JW dimensions ...
Page 61: ...Operating Manual Arc fault protection ZŁ 4A 07 2019 61 Fig 36 Page 2 STATUS using ...
