Example Of An Order Code; Functional Safety; Safety Funcions; Safety Concept - Reer SAFECODER Instalación Uso Y Mantenimiento

SAFETY SINE/COSINE INCREMENTAL ENCODER

2.1 Example of an order code

3. Functional safety

3.1 Safety Funcions

According to EN 61800-5-2, the following safety functions can be achieved with
the encoder:
SS1: Safe Stop 1
SS2: Safe Stop 2
SOS: Safe Operating Stop
SLS: Safe Limited Speed
SLI: Safe Limited Increment The respect of a specific step value during motion of Position is
SDI: Safe Direction
SSM: Safe Speed Monitoring

3.2. Safety Concept

INCREMENTAL ENCODER FUNCION
In order to achieve safe incremental information with the encoder, the controller must
monitor the validity of the analogue, 90° phase-shifted sine/cosine signals with the help of
the function.
The risk of mechanical faults (as might occur, for example, if the rigid torque stop with
torque pin were to break or the encoder to fall off the motor shaft) is eliminated as a
result of the mechanical over-dimensioning of the components of our safety encoders.
The encoder does not prevent from switching the plant on again after a malfunction; if
this function is necessary, it is to be ensured by the control.
The encoder is safe only when used in conjunction with a device that can monitor the
functions mentioned.
 
The safety controller ReeR Mosaic, via expansion modules (Mosaic MV) is able to
monitor and control the security Safecoder according to SIL 3, PL e.
8540939 - 05/2013 - Rev.0
Monitoring of the braking ramp and STO after standstill
Monitoring of the braking ramp and SOS after standstill
Monitoring of the standstill of the energized and controlled motor
Monitoring of a speed limit value.
monitored.
Monitoring of the unintended direction of motion of the motor.
A safe output signal is generated when the motor speed is
lower than a specified value.
sin (x) + cos
2
(x) = 1
2
3