Fireye PPC6000 Series Manual page 104

Option 24.6 – lag (slave) On Rate (0-100%) LV1
This value determines the firing rate of the lead (master) boiler at which the first and all subsequent slave(s)
(lag) boilers come on. The slave(s) (lag) boiler(s) will be delayed in coming on by the time set in Option
parameter 24.7. At this point, the lead (master) and the last "lag on" will begin to modulate in unison. If the
lead (master) and modulate above this point, the next, as determined by priority number (Option 24.1, 24.2,
24.3), will be turned on. When more than one boiler is on, the master and last slave will modulate in unison
while the other slaves modulate on their own PID,
Option 24.7 – lag (slave) On Delay (0-999 minutes) LV1
This option sets the time delay between the modulation rate of the lead (master) boiler (and last boiler on if
any) exceeding the value set in Option 24.6 and the next being turned on.
This time may also include additional time as set in Option 25.6.
Option 24.8 – lag (slave) Off Rate (0-100%) LV3
When the lead (master) boiler and last boiler modulate below this modulation rate and exceed the value set in
Option 24.9, the last turned on will be turned off. At this point, the lead (master) and the previous (if any) lag
turned on will begin to modulate in unison until they together are below this setting. This will continue until only
the lead (master) boiler remains on.
Option 24.9 – lag (slave) Off Delay (0-999 minutes) LV3
This option sets the time delay between the modulation rate is at or below the value set in Option 24.8 and the
last turned on being turned off. This also sets the time delay between successive slaves (lag) being turned off
should the modulation rate stay below the setting in Option 24.8.
Option 25.0 – Banking based on temperature / water temperature standby for steam boiler LV3
This option sets which input will be used and the 4-20mA current input from the temperature sensor must be
connected into one of the 5 possible current inputs:
0 = lag banking on temperature is not enabled.
1 = uses analog input 1 (PB8 to PA5 input)
2 = uses analog input 2 (PB8 to PA6 input)
3 = uses analog input 3 (PB8 to PA7 input)
4 = uses analog input 4 (PB8 to PA8 input)
5 = uses analog input 5 (PA12 supply to PA13 input)
NOTE -
If a loop-powered sensor is used, the "+" to the sensor is taken from PB8/PA12 ("sensor supply", JP3
must be set to the "30V" position) and the "-" from the sensor is connected to PA5, PA6, PA7, PA8 or PA13
depending on which input number is to be used. If the temperature sensor gives a current feedback that is out of
range, i.e. Less than 3.5mA or greater than 21mA, lag banking on temperature will be cancelled and the sequence
lag boiler will bank based on steam pressure.
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