8 Multi Burner Operation
Mk8 MM Manual Page | 155
8.6 Multi-Burner External Modulation
Multi-Burner can be used with both permanent external modulation and switched external modulation. Only
the Master MM needs to be wired for external modulation. Please see section 6.6 for more details about
external modulation.
8.6.1 Permanent External Modulation
With option 45 set to 1 or 2 and option 55 set to 0 for permanent external modulation the following occurs
when there is an error/lockout:
Option 43 = 1
If either the Master or Slave MM has a lockout, then both MMs will go into standby. Once the fault condition
has been cleared, both MMs will start up in sync.
Option 43 =2
If the Master MM has a lockout, then the Slave MM will continue to fire at low flame hold. Once the lockout is
reset, the Master MM will go through its start-up sequence and the MMs will sync once it has reached firing;
they will continue to fire as per the external modulation signal.
If the Slave MM has an error/lockout, then the Master MM will continue to fire on its own, following the
external modulation to reach the setpoint.
8.6.2 Switched External Modulation
With option 45 set to 0, and option 55 set to 1 for switched external modulation, a line voltage on terminal 88
switches the MM from internal PID to external modulation. Switched modulation cannot be used with
sequencing.
The following occurs when there is a lockout:
Option 43 = 1
When the terminal 88 input is switched on, all MMs change to external modulation. If either the Master or a
Slave MM has a lockout with either external modulation switched on or off, all MMs will go into standby.
Once the fault has cleared, they will start up and fire in sync.
Option 43 = 2
With the switched external modulation input turned off on terminal 88, so that all MMs are using the internal
PID, if the Master or a Slave has a lockout, then the other will continue to fire following the internal PID.
Once the fault has cleared, they will fire simultaneously with internal PID.
If the MMs are switched on for external modulation and the Master MM has a lockout, then the slave MM will
go to internal PID and continue to fire. Once the lockout has been reset, the Master MM will go through the
start-up sequence and synchronise with the Slave MM once it has reached firing status, they will continue to
fire following the external modulation.
If the MMs are switched on for external modulation and a Slave MM has a lockout, the Master MM will
continue to fire with external modulation. Once the fault has been reset, they will sync when the Slave MM
reaches firing status and continue with external modulation.
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