Flame Safeguard (MM80001/FSG) Manual
VPS operates before start-up
VPS operates after shutdown
VPS operates before and after
BC: Gas Valve Configuration
No vent valve. Single valve pilot
Vent normally closed. Single valve pilot
Vent normally open. Single valve pilot
BC: Fuel valve output configuration
This sets the way multi-fuels are configured on the MM. Setting 0, allows
the configuration of 4 fuels and switching between them is possible using
changeover relays. Setting 1 allows 2 fuels to be configured with each fuel
having its own set of outputs and switching between fuels is possible without
changeover relays. Setting 2 is similar to setting 1 but with the possibility of
fuel Change on the Fly (COF). See section 4 of this guide for the full details.
Fuel curves must be commissioned for each fuel valve output mode. This
option must be set before commissioning the MM.
One set of outputs (changeover relays, 4 fuels)
Two sets of outputs (no changeover relays, 2 fuels)
Two sets of outputs, change on the fly (COF)*
BC: Gas Valve Proving Time
This is the time period for when both gas valves are closed to detect a
change in air pressure for the ‘VPS air proving’ phase, or change in gas
pressure for ‘VPS gas proving’ phase.
BC: Maximum Pressure Change Allowed During VPS
If MM detects a pressure change greater than this value, a lockout will
occur. See parameter 41 for gas pressure display units.
0 mbar – 1340 mbar (value 25 = 2.5 mbar)
0” WG – 537.777” WG (value 25 = (1.003 ”WG)
0 PSI – 19.435 PSI (value 25 = 0.036 PSI)
BC: VPS Valve Opening Time
This is the time period for when the phases when a gas valve is opened –
‘VPS Venting’ for the void to vent to atmosphere and ‘VPS Void to Gas’ for
the void to fill with gas.
BC: Purge Time Units/ NFPA Post-Purge
See option/ parameter 118 for the purge timing. For setting 2,
option/parameter 118 must be set to 15 seconds or higher. During the NFPA
post-purge, all the servomotors will remain in the position they were in
before normal shutdown or lockout. The NFPA post-purge will occur under
any normal shutdown or lockout at any point in firing.
NFPA post-purge in seconds
NFPA post-purge in minutes