Car Top Encoder Wiring; Lonworks Neuron Network Wiring; Dispatcher Communication Wiring; Proper Grounding Procedures - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

4.1.8 Car Top Encoder Wiring

The car top encoder communicates to the car MPU (Micro Processor Unit) via a neuron network
at an extremely high frequency. The devices at both ends of the network are extremely intelligent
in that they check for errors in the message every time the information is sent.
However, to be extra cautious, we recommend the communication cable be a shielded pair wire.
Preferably a shielded twisted wire, although this is not provided in most traveling cables. We also
recommend the shield be tied to controller ground only at the controller end.

4.1.9 LonWorks Neuron Network Wiring

The neuron network is very noise immune, and grounding is not a tremendous concern, however
the cable connecting two LonWorks devices should have their shields grounded at the source end.
The drain wire from the shielded cable should be tied to earth ground at the input end and taped
off at the other end. By this we mean the following:
MPU board to Encoder board - Ground the shield at the controller and tape off the shield wire
at the encoder.
Encoder board to Car Station board - Ground the shield at the Encoder board and tape off the
shield at the Car Station board.
Dispatcher Link (Network B connections from the dispatcher to the first car and from car to car) -
Install the wire from the dispatch MPU board to the MPU board of the first car in the group. Ground
the shield at the dispatcher end. The shield at the car end should not be connected. The next car
in the group should have the shield grounded at the first car, and left off at the next car.
Subsequent cars will be connected in a similar manner. Refer to the wiring diagrams proper
connections.

Dispatcher Communication Wiring

4.1.10
Communication cables between the car and dispatcher should be run in a separate conduit from
any power wiring. There are some required interconnections for redundant signals between the
dispatcher and the cars. These can be run with the communication cable in the same conduit.
Refer to the wiring diagrams for the proper connections.
Communication cables between the dispatcher and lobby displays or building management
systems should be done in shielded pair wiring.
4.1.11

Proper Grounding Procedures

A proper ground is essential to trouble free operation. GROUND is defined as a direct connection
to EARTH GROUND. This type of ground is not always available from the electrical supply panel.
Electrical codes vary in some areas, and some electrical codes consider the conduit used to carry
the conductors the ground for the system.
We do not consider the electrical conduit to be a sufficient ground for our system. Electrical
ground should be obtained and certified from the electrical contractor. If this is not available, keep
the following in mind when seeking an adequate connection to EARTH GROUND:
1. The building steel is not always earth ground. In most cases, building beams rest
Revision: AA 2.2
Microflite Ultra 2000
Printed 03 - 15 - 03 4 - 4