Car Top Encoder - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

Microflite Ultra 2000
Inputs
The inputs are wired to the side of the board that does not have the blue relays. Inputs can be either
24 VDC or 110 VAC. The inputs use a current limiting resistor in conjunction with bi-directional
optocouplers so AC or DC inputs can be used on the same board. All opto-couplers are socketed so
in the event of an over-voltage, the components can be replaced instead of the entire board.
The first 18 pin connector on the board is typically reserved for car calls. On the 18 pin connector
(CJ8) pins 16 - 9 will typically be the first 8 car calls with pins 17 and 18 being the common for the car
calls. Pins 8 - 1 will typically be the next group of 8 car calls, again with pins 17 and 18 being the
common. After the first two groups of eight, the remaining inputs are arranged in groups of 8 with the
9th pin on the connector being the common for those eight inputs. Every job will come with a sheet on
the prints that will show the correct wiring of the devices on the board.
Outputs
The outputs are wired to the side of the board that has the blue relays. The outputs are dry contacts
of these relays and can drive signals up to 110 VAC at 5 amps.
The outputs are arranged exactly like the inputs. The first 18 pin connector is typically reserved for
car call acknowledgment lights. Pins 16 - 9 will typically be the first 8 car call acknowledgment lights
with the common for the light being hooked to pins 17 and 18. Pins 8 - 1 will typically be the next
group of 8 call acknowledgment lights, again with pins 17 and 18 being the common. After the first
two groups of outputs, the remaining outputs are arranged in groups of 8 with the 9th pin being the
common for those eight outputs.

13.1.4 Car Top Encoder

The car positioning system includes a 2" wide perforated steel tape mounted from the top of the
hoistway to the bottom. Holes are spaced precisely every 3/4" on center and read by a position
feedback encoder mounted on top of the car. The optical sensors are mounted in a unit referred to as
"the stick" and are set up so car position can be obtained within + 1/16". In other words, the main
processor always knows where the car is in the hoistway within 1/16". The position information is
processed by a processor located on the car top and sent to the main processor via the two wire LON
network.
The encoder will allow the car to run with two out of the six sets of sensors disabled. When the car
arrives at a particular floor and the actual encoder value varies from the stored floor landing value by
more than 5 counts, an "Excess Encoder Deviation" fault message will appear on the car's diagnostic
monitor. When the first set of sensors becomes disabled (normally through dirt accumulation), an
"Encoder Sensor Failure" message will appear on the car's diagnostic monitor. Two additional
sensors are provided to sense guide wear on the stick. When these sensors detect the guides are
worn, an "Encoder Excess Guide Wear" message will appear on the car's diagnostic monitor.
An magnet mounted at each floor allows the correct position information to be updated to the
microprocessor in case of position loss. The magnet is encoded by length. The lowest floor magnet is
6 ½" inches in length, the next floor magnet above that is 7", and the next floor magnet above that is
7 ½", a continuing in ½" increments. If you had a forty story building, the magnet for that floor would
be around 26" long.
The encoder electronics will stay energized for up to twenty seconds after the main power to the
controller has been removed. This allows the encoder to store the exact car position, even if the car is
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