Introduction and Technical Data 25
Control terminals on lower power board numbers 41 to 53 (NC signifies no connection) RA + 41
NC 42
REMOTE AVF
RA + RA- used for remote sensing of armature volts RA- 43
(Note, when using remote A VF, the Armature volts signal is read 3.3 % high) NC 44
CON1 and CON2
Volt free contact for main contactor coil up to 240V 500 V A. C ON1 45
Operated by START/JO G function, when CSTOP is high C ON 2 46
LATCH1 and LATCH2
Volt free contact operates at same time as C ON1/2 240 V 500V A. LA T1 47
LA T2 48
EARTH
on 51 is used for dirty earth connection of control supply EARTH 51
N 52
L and N
are for control power 100-2 40 V, 5 0 - 60Hz + /-10 %, 50 V A L 53
Note. The control supply is required to power the PL/X electronics and must be applied before running.
3.4 Contr ol terminals overview.
3.4.1 General requirements
The general requirements of industrial process equipment are that apart from performing thei r intrinsic
function, they must interface with external systems. The most common requirements are for 4 types of
interface.
Analogue inputs, able to accept linear bi-polar reference or feedback signals.
Analogue outputs able, to provide linear bi-polar signals.
Digital inputs able, to recognise logic levels using 24 V logic.
Digital inputs for encoders signals of various amplitudes and type.
Digital outputs able, to drive 24V relays, lamps, sensors etc.
System requirements are variable. Some require a lot of one type of interface, others a selection of all types.
The designers of the PL/X series of drives have attempted to provide sufficient of all types to meet all
conceivable requirements. This has been achieved by making many of the terminals dual function. The
possible boundaries are as follo ws.
Up to 17 digital inputs, 8 analogue inputs 7 digital outputs 4 analogue outputs
This is achieved by allo wing the 8 analogue inputs to also be used as digital inputs, and 4 digital outputs that
can be independently programmed as inputs.
The analogue outputs do not usually need to be so numerous, as soft w are connections can be made by the
user. Even so 4 analogue outputs are available of which 3 are programmable. The analogue outputs are
individually short circuit protected to 0V. However they are not protected for simultaneous shorts.
3.4.2 Digital inputs and outputs
An important consideration is the ability of the equipment to survive a harsh environment. The most frequent
types of problem are short circuits and excessive voltages being applied to the digital inputs and outputs. All
the digital inputs and outputs can withstand up to + 50V applied continuously. All digital outputs, including
the 24V customer supply have been designed to withstand a direct short circuit to 0V. If a short circuit or
overload occurs on one or more of the digital outputs, then all digital outputs are disabled and the short
circuit condition is flagged. It is possible to enable or disable a drive trip in this event. Providing the fault has
not caused external user relay logic to interrupt normal running, then the drive will continue to run if the trip
is disabled. The short circuit condition may be signalled on one of the outputs by a lo w state if desired. If the
short circuit is removed the digital outputs will recover to their original state. See 8.1.4 M OTOR DRIVE
ALARMS / Digital OP short circuit trip enable PIN 174 and 8.1.11.14 DRIVE TRIP MESS A GE / Short circuit
digital outputs and 7.5 DIA GNOSTICS / DIGIT AL IO M ONIT OR.
Note. The DIP digital inputs on T14-17 are also characterised for use as encoder inputs (hence l ow noise
immunity). The DIO digital input/outputs on T1 8-21 are characterised for 24V logic (standard noise
immunity). The UIP analogue inputs on T2-9 can also be used as digital inputs. (optimum noise immunity).
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