Hi
I grabbed this image
from this Tech Note
https://www.smc.eu/portal_ssl/webpages/00_local/cee/services/safety_folder/pdf_securitybrochure_en.pdf
I was hoping someone might be able to explain the operation to me in the following scenario...
Scenario:
1) Following the activation of a safety function the cylinder controlled by 2V1 is in the fully extended position.
2) The safety system is then reset.
3) Upon operation of the reset button a free flowing path to the annulus side of the cylinder is made through valve 2V1. The cylinder moves back into its fully retracted state upon operation of the Safety reset button.
-Question
The 13849/1 regs state in section 5.2.2 that
The manual reset function shall
— be provided through a separate and manually operated device within the SRP/CS,
— only be achieved if all safety functions and safeguards are operative,
— not initiate motion or a hazardous situation by itself,
— be by deliberate action,
— enable the control system for accepting a separate start command,
— only be accepted by disengaging the actuator from its energized (on) position.
So I guess my question is what's happening? Have I misinterpreted the diagram? or Have I misinterpreted the regs? Or both?
thanks,
Btw, I have sent this question to festo and SMC -but I expect ill get a better quality answer, faster, from this forum!
I grabbed this image
from this Tech Note
https://www.smc.eu/portal_ssl/webpages/00_local/cee/services/safety_folder/pdf_securitybrochure_en.pdf
I was hoping someone might be able to explain the operation to me in the following scenario...
Scenario:
1) Following the activation of a safety function the cylinder controlled by 2V1 is in the fully extended position.
2) The safety system is then reset.
3) Upon operation of the reset button a free flowing path to the annulus side of the cylinder is made through valve 2V1. The cylinder moves back into its fully retracted state upon operation of the Safety reset button.
-Question
The 13849/1 regs state in section 5.2.2 that
The manual reset function shall
— be provided through a separate and manually operated device within the SRP/CS,
— only be achieved if all safety functions and safeguards are operative,
— not initiate motion or a hazardous situation by itself,
— be by deliberate action,
— enable the control system for accepting a separate start command,
— only be accepted by disengaging the actuator from its energized (on) position.
So I guess my question is what's happening? Have I misinterpreted the diagram? or Have I misinterpreted the regs? Or both?
thanks,
Btw, I have sent this question to festo and SMC -but I expect ill get a better quality answer, faster, from this forum!