beautypg.com

Det-Tronics EQP Fire and Gas Detection/Releasing System SAFETY MANUAL User Manual

Page 17

background image

5.1

95-8599

15

System Response Time
The EQP Safety System will have a typical response

time of less than 1 second, to which must be added

the response time of the final elements to give the total

response time.

The worst case theoretical response time of the EQP

Safety System, the time taken from an input transition

being detected to an output being asserted, is

estimated by the following:

• Detection at field device to the Controller over

EQPSL network
– Small system <100 field devices < 3.2 seconds

(user logic constrained to 0.5 seconds)

– Large system >100 field devices < 9.1 seconds

(user logic constrained to 1.5 seconds).

• Worst case response times assume user logic

execution time is constrained to
– Small system < 0.5 seconds
– Large system < 1.5 seconds.

• Worst case Controller to EDIO output < 6.3 seconds.

• Worst case response times assume a high level of

lost messages due to internal or external influences,

and three subsequent retries.

nOTE

the worst case theoretical response time, as
required by IeC 61508, will only occur once per
1,000,000 trips. It must occur during the worst
case degraded communication conditions
possible without generating a communication fault.

Note

the process safety time must be compared with
the response time of the entire safety function. In
addition to the response time of the eQP Safety
System, the response time of the input sensors and
output actuators must be included.

Product Repair
The EQP Controller and Field Devices are not field-

repairable and any internal device repairs must be

conducted at the factory. No firmware changes are

permitted or authorized. All failures indicated by

internal diagnostics or Proof Tests that cannot be

resolved through the troubleshooting and maintenance

procedures described in the manual must be reported

to the manufacturer. Refer to the DEVICE REPAIR AND

RETURN section of the EQP system instruction manual,

number 95-8533.

Spare Parts
Refer to the REPLACEMENT PARTS section of the

instruction manual. Safety certification is based on a

sufficient number of spares to achieve a 24 hour mean

time to repair.

Applicable Standards

• IEC 61508:2000. “Functional Safety of Electrical/

Electronic/Programmable Electronic Safety-related

Systems”.

• IEC 61511:2003. “Functional Safety - Safety

Instrumented Systems for the Process Sector”.

Product Certifications

FM

APPROVED

®

FM, CSA, ATEX, IECEx, CE, exida, and others.

FMEDA Report available.

For complete information regarding performance,

installation, operation, maintenance and specifications

of the Eagle Quantum Premier system, refer to

instruction manual 95-8533.