Leroy Somer VARMECA 30 Installation Et Maintenance page 52

LEROY-SOMER
3.5.2 - Connection diagram with safety input
3.5.2.1 - Safety input
this input, when opened, causes the drive to lock. Independent
of the microprocessor, it acts on several levels of control from
the power bridge. It is designed in such a way that even if one
or more circuit components were to fail, the absence of torque
on the motor shaft is guaranteed with a very high level of
integrity.
this input is used to create a safety function using the principles
of category 1 or 3 of standard en954-1, depending on the
application diagram.
the design of the «freewheel stop» function using input sDI2
has been evaluated by cetIm.
the results of this examination are recorded in report no.
732773/47a.
this built-in functionality enables the drive to act as substitute
for a contactor in order to stop the motor in freewheel mode.
By using this safety input redundantly with another drive logic
input, a diagram can be used which is capable of resisting a
single fault. the drive will stop the motor in freewheel mode
using two different control channels.
For correct use, the power connection diagrams described in
the following paragraphs must be adhered to.
to unlock the drive and provide the safety function, safety input
ena (Vma 31/32) or sDI2 (Vma 33/34) must be connected to
the +24V source (sDI1 for Vma 33/34).
this +24V source should be reserved exclusively for the safety
input function (Vma33/34).
20
InstallatIon anD maIntenance
VARMECA 30
Variable speed motor or geared motor
• The safety input is a safety component which must
be incorporated into the complete system dedicated
to machine safety. As for any installation, the complete
machine must be the subject of a risk analysis by the
integrator which will determine the safety category with
which the installation must comply.
• The safety input, when open, locks the drive, meaning
the dynamic braking function is no longer available. If a
braking function is required before the drive safety lock is
applied, a time-delayed safety relay should be installed to
activate locking automatically after the end of braking.
If braking needs to be a machine safety function, it should
be provided by an electromechanical solution since the
dynamic braking by the drive function is not considered to
be a safety function.
• The safety input does not provide the electrical isolation
function. Before any work is carried out, the power supply
must be cut by an approved isolating device (isolator,
switch, etc).
• The safety function is not enabled when the drive is
controlled via the keypad or via a fieldbus.
3776 en - 2013.06 / k