13 Relay Assignment
Relay Specifications
There are two relays mounted in the SF910i. Each relay has a single pole (NO - Common)
contact arrangement.
Refer to Appendix A for detailed relay specifications.
Assigning Relay Use
The user can specify the purpose of each relay based on the requirements. Change
relay assignments using Configuration-Mode parameters.
– Relay A - It (usually referred to as ‘flame relay’) is always assigned as the
Flame-relay. It energizes when a Flame-Proven condition occurs, and no faults are
detected by the diagnostic and self-checking.
– Relay B - It (usually referred to as ‘safe relay’) can be used for four different purposes
depending on the needs. The options are outlined below in the table.
Table 13.1: Possible Use of Relay B
ExplanationUsage of Relay B
This is the default usage. Most of applications will use Safe-relay as “Safe relay”.Safe-relay
Safe-relay is energized when no faults or other critical conditions are detected.
When a fault or critical condition is detected, it de-energizes. This event will also
always de-energize relay A.
For SIL2 safety, IEC 60730-1, CAN/CSA E60730-1, or EN298 application, Safe-relay
needs to be set into “second flame relay” condition, and must be serially connected
with Flame-relay contacts by customer to fulfill safety redundancy output
Relay B can be also used as a second Flame-relay.Second Flame-relay
It energizes when flame is proven using the alternative function set (if single sensor).
It energizes when the flame is proven for the second sensor and the second sensor
is logically connected to this relay.
For SIL2 safety, IEC 60730-1, CAN/CSA E60730-1, or EN298 application, Safe-relay
needs to be set into “second flame relay” condition, and must be serially connected
with Flame-relay contacts by customer to fulfill safety redundancy output
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13 Relay Assignment
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