Ss1 – Safe Stop 1 - Festo CAMC-G-S3 Manual

2 Product description of safety module CAMC-G-S3
2.5.3 SS1 – Safe Stop 1
Application
The function described here implements the safety function SS1 according to
EN 61800-5-2.
Use the "Safe Stop 1" function (SS1) whenever you have to brake the motor and then
reliably disconnect the energy supply to the motor in your particular application but there
are no additional requests for targeted stopping of the drive (cf. stop category 1 in
EN 60204-1).
The three characteristics described in the standard are supported:
a) Triggering and controlling the rate of motor deceleration within specified limits and
triggering the STO 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),
then the output stage is switched off.
b) Triggering and monitoring the motor deceleration variable within specified limits and
triggering the STO 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 the output stage is switched off.
c) Triggering the motor deceleration and after an application-specific time delay, trigger­
ing the STO function.
è The safety module delivers a status signal, the basic unit must be braked by the
functional controller, after a waiting time the output stage is switched off.
The SS1 function is activated by the factory setting (advance parameterisation).
As long as the function is used by other functions (error response on violation of other
requested safety functions), it cannot be deselected.
Function
When requesting the SS1 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, STO is triggered and the
power output stage is switched off safely.
Please note
If there are suspended loads, they usually drop if STO is requested immediately after
the slowdown ramp has elapsed.
For this reason, the SS1 can also trigger through SBC, meaning that an existing clamp­
ing unit or holding brake engages, avoiding dropping of an axle. SBC then triggers STO
(linkage of the safety functions SS1 } SBC } STO).
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English 77