Technical description 8100_ A
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PULSE TRAIN INPUT
With digital frequency input (C005) the set-value 1 is provided as absolute frequency
via X5, Le. the internal frequency set-value is directly proportional to the frequency
of the input signals. The conversion factor results from the settings under C026 and
C027.
encoder adjustment (C027)
fdset [Hz] = fmaster [Hz] .
encoder constant (C026)
When calculating the frequency reference fdset. an error up to 1% of fdmaxis
possible.
4.5 SERIAL INTERFACES
The inverters of the 8100_A series can communicate via the serial interface LECOM1
(X6) with superimposed hosts (PLC or PC). The LECOM1 interface (connector X6) is
used to process the
LECOM-A/B-protocol. The LECOM1-interface can also be used to
connect devices
to the RS 232C standard (LECOM-A)or to the standard RS485
(LECOM-B). The interface is suitable for parameter setting, surveillance, diagnosis
and simple control tasks.
The common RS 232 C interface, simple point-to-point connection with a maximum
cable length of 15 m can be achieved. Almost every personal computer (PC) or other
master system has this interface. For several drives and greater distance, the RS485
interface must be used. Only two wires are used to enable the communication of up
to 31 controllers via a distance of maximum 1200 m. Alternatively, the connections
can also be done via optical fibres. Further information can be obtained from the
technical description LECOM LI.
The LECOM A/B-protocol is based on the 1745 ISO standard and supports up to 90
controllers. It recognizes faults and therefore avoids the transmission of faulty data.
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