Leroy-Somer VARMECA 30 Instalación Y Mantenimiento página 56

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).
54
INSTALLATION AND MAINTENANCE
VARMECA 30
Variable speed motor or geared motor
CONNECTIONS
• 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 - 07.2007 / h