45
®
When setpoint 1 is selected and the remote setpoint function is enabled (see Option 5.8), this is the
PID control value displayed when a 4mA signal is present on the auxiliary modulation input. See
Derivation of Modulation Rate.
There is no such function for setpoint 2.
This parameter is not used when a track modulation input type is selected.
Option 6.8 - Setpoint 1 remote span value (0 -999)*
When setpoint 1 is selected and the remote setpoint function is enabled (see option parameter 05.8),
this is the PID control value displayed when a 20mA signal is present on auxiliary modulation input.
See Derivation of Modulation Rate.
There is no such function for setpoint 2.
This parameter is not used when a track modulation input type is selected.
Option 7.0 - Setpoint 1 control limit type (0 - 2)*
This option parameter defines the control limit type for setpoint 1, where:
Option 7.1 -Setpoint 1 low limit control value (0 - 999 / 00.0 - 99.9 / 0.00 - 9.99)
If the boiler is off due to a controlled shutdown, this parameter defines the measured value at which
the boiler will be turned on again.
Option 7.2 - Setpoint 1 high limit control value (0 - 999 / 00.0 - 99.9 / 0.00 - 9.99).
If the boiler is on and firing, this parameter defines the measured value at which the boiler will be
turned off via a controlled shutdown.
Option 7.5 - Setpoint 1 warming limit (0 - 999 / 00.0 - 99.9 / 0.00 - 9.99)
If the boiler’s measured value is below the value of this parameter and the unit is in auto or sequenc-
ing mode, the burner will be held at low fire.
Note: the warming limit is only applied to the first start-up after the “Burner On” signal (Terminal
PB7) has been detected. Re-starts after a Controlled Shutdown will not use the warming limit if PB7
is maintained on.
Option 7.6 - Setpoint 1 warming time (0 - 360)
If the boiler’s measured value remains below the warming limit set in option 07.5 for longer than the
warming time set here in minutes, the boiler will be allowed to modulate normally.
Option 8.0 - Setpoint 2 input type (0 - 4)*
The setpoint 2 input type must be selected as follows:
Note: the remote setpoint input is ignored when Setpoint 2 is selected, refer to Option Parameter
5.8.
0
No limits.
1
Absolute limit. The values entered in the option parameters 7.1 and 7.2 are the actual limit values.
2
Deviation limit. The values entered in option parameters 7.1 and 7.2 represent a deviation from the setpoint 1 control value.
This means that if the setpoint control value is changed, the limits are automatically changed correspondingly.
0
Setpoint 2 not available.
1
Track modulation input. (Where minimum input signal = low fire, maximum input signal = high fire).
2
Measured value input, PID control, values displayed with no decimal place
3
Measured value input, PID control, values displayed with 1 decimal place.
4
Measured value input, PID control, values displayed with 2 decimal places.
