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14-4
Serial Communications
590+ Series DC Digital Converter
5703 Support
This unit provides the facility to run a line of converters in speed-lock without the use of a 5720
Quadraloc controller; for accurate speed-holding, encoder feedback is required. Ratioed speed-
locking is supported, although the unit is not intended to replace the Quadraloc in applications
requiring high accuracy.
A 16-bit speed signal is passed between drives through a fibre-optic link and the P3 port on each
Converter (a port otherwise used only off-line for the upload and download of EEPROM data).
The port operates RS232 compatible signal levels, the 5703/1 converts these signal levels to
fibre optic signals for transmission and from fibre optics to RS232 for reception.
Hardware Description
The 5703/1 is housed in a DIN rail mounted box and is provided with a cable to connect into the
P3 port. The cable is 400mm long to limit transmission errors, the primary unit -to-unit
interconnection is intended to be achieved by a fibre optic cable.
The 5703 unit itself is simply an electric signal-to-light converter and does not alter the signal in
any way, this is achieved within the software data of the Converter.
It is fitted with one fibre optic receiver and two fibre optic transmitters, the fibre optic receiver
has a fixed function to receive data from the preceding unit while the transmitter sends data to
the following unit. The additional transmitter can be used either to re-transmit the incoming
signal or provide a second transmission of the output signal, this gives the unit wide
functionality. When the link is in the normal right hand position, assuming the board is mounted
with the fibre optics downward, the second transmitter repeats the output signal. In the left hand
position it repeats the input signal.
The 5703/1 can be configured to point to any relevant parameter in the block diagram, the
default connections are such that the scaled input is connected to the "additional speed demand"
and the output to the "speed demand".
DRIVE
5703/1
FIBRE OPTIC OUTPUTS
TRUNKING
4-WAY
CONNECTOR
TRANSMITTER
RECEIVER
TRANSMITTER
DIN
RAIL
1
2
4-WAY CONNECTOR
P3 PORT
TRUNKING
PREFORMED 4-WAY CABLE
Figure 14-1 5703/1 Product Outline Drawing