nVent RAYCHEM Elexant 4010i/4020i User Manual
RAYCHEM-AR-H60624-40X0iOpsManual-EN-1905 nVent.com
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8. Check for ON: Measure the voltage to the heater at the limiter contactor output relay, to verify the
output is on.
9.
10. Result: The red Alarm LED lights up and the Output LED of the unit switches off. The Safety Limiter
11. Check for OFF: Measure the voltage to the heater at the limiter contactor output relay, to verify the
output is off.
12.
13.
14. Clear the alarms.
15. The orange Output LED is now on, and the red Alarm LED is off.
16. Check for ON: Measure the voltage to the heater at the limiter contactor output relay, to verify the
output is on.
Clean up steps:
1. Return Intelligent Limiting to its original setting.
2. Return the control algorithm to its previous setting if it was changed to force the output on.
4.1.10 Test in the event of a Fault
the Safety Limiter in the Safety Limiter’s Maintenance page, and any active alarms. If no issues are
replaced. See Section 1.3 for nVent Customer Care contact information.
4.1.11 Determining Safety Integrity of the Elexant 4020i-Mod-IS-LIM
1.
2.
3.
support the assumed failure rates for recognized and unrecognized hazardous failures.
SFF of an element Hardware Fault Tolerance
0 1 2
< 60% Not Allowed SIL 1 SIL 2
60% - 90% SIL 1 SIL 2 SIL 3
90% - 99% SIL 2 SIL 3 SIL 3
SIL 3 SIL 3 SIL 3
Table 12 - Maximum SIL for Type B with SC 2
4.1.12 PFDavg Safety Function
The limiter temperature sensor, limiter electronics and the limiter relay together form the safety related
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