User's Manual
AUTEC - Air series
Warnings for installation 13
LIAIRE02-02
Relay outputs of receiving unit's commands are dimensioned so as to
control power loads. Contacts of those outputs are protected by means of
over-voltage suppressors (varistors), to ensure the maximum lifetime of
relays in most applications.
Suppressors connected in parallel with contacts of commands' relays may
be incompatible with the connection to a high-impedance load (e.g. some
PLCs); please contact Autec to perform correct installation.
Loads connected to the relay outputs must ensure the minimum power,
voltage and current value that the contacts can switch with good reliability
(300mW, 5V, 5mA). Connect an additional load to the outputs if necessary.
If a receiving unit's output (be it a solid state output or the contact of a relay)
controls a DC inductive load (i.e. solenoid valves, relays), it is advisable to
connect a recovery diode in anti-parallel with the driven load, to reduce the
eectsofdemagnetizingcurrents.
PayspecialattentiontocurrentsandvoltagesowingintheSAFETYand
STOP outputs: they shall not exceed the maximum permitted values (see
technical data of the receiving unit).
To obtain the protection from unintended movements from the rest position,
connectthecontactoftheSAFETYrelayinserieswiththemovement
commands.
The STOP circuit in the receiving unit has two contacts connected in series
through a wire jumper (manufacturer's standard wiring). If the machine needs
a STOP circuit with two separate contacts (four wires), this bridge can be
removed. In this case, the installer is responsible for wiring in a way that
assures the required safety level.