Ss2 – Safe Stop 2 - Festo CAMC-G-S3 Manual

2 Product description of safety module CAMC-G-S3
2.5.4 SS2 – Safe Stop 2
Application
The function described here implements the safety function SS2 according to
EN 61800-5-2.
Use the "Safe Stop 2" function (SS2) if you brake the motor in your application and must
then ensure that the motor will not deviate from the holding position by more than a spe­
cified amount (cf. stop category 2 in EN 60204-1).
The three characteristics described in the standard are supported:
a) Triggering and controlling the motor deceleration variable within specified limits and
triggering the SOS function when the motor speed falls below a specified limit value.
è The drive is taken through a slowdown ramp until it is detected as idling (P06.09),
after which a safe operating stop is executed.
b) Triggering and monitoring the motor deceleration variable within specified limits and
triggering the SOS function when the motor speed falls below a specified limit value.
è The safety module activates a fast stop in the basic device, the slowdown ramp is
monitored, after which a safe operating stop is executed.
c) Triggering motor deceleration and after an application-specific time delay, triggering
the SOS function.
è The safety module delivers a status signal, the basic device must be braked by the
functional controller. After a waiting time, the safety function SOS is activated.
The SS2 function can also be used as an error response (when other requested safety
functions are violated). For this, it must be activated and parameterised.
Function
When requesting the SS2 safety function, this checks that the drive is braked to idle within a defined
time using a defined slowdown ramp. After the defined time has elapsed, SOS is triggered and thus a
safe operating stop executed.
84 Festo – GDCP-CAMC-G-S3-EN – 1406NH – English