Section 4 — System Configuration Hawk 1000
4-16 Part No. 750-366
Figure 4-15. Remote Modulation signal select
Remote Modulation by Communications
This configures the Boiler Controller
to
receive a Remote Modulation signal directly by Communications
(Ethernet). Modulation units range from 0-100%. Communication integrity is determined by a Communication
Heartbeat signal between the Control System and the Building Management System. If a Communications
failure is detected, an alarm message “Remote Communications Failed” is displayed on the HMI and
Modulation reverts back to the LOCAL setting on the HMI
Remote Set Point by Analog Input
This configures the Boiler Controller
to
receive a remote 4-20mA signal on input I:2.3 to vary the
set
point
of the boiler.
Note: Remote Setpoint is not allowed for low emission steam boilers
.
With Remote Setpoint selected, the analog signal can be scaled to the engineering units on the “Alarm and
Limits” Screen, by setting the Remote Setpoint Scaling values (zero and span) of
the
remote 4-20mA signal
Remote Set Point by Analog Input Signal Selection
The user can select between HMI or digital input to enable Remote Set Point.
Select <Digital In> if another control system will enable
R
emote
Set Point by isolated contact input signal
(120
VAC) on digital input I:5.14.
When
that
input is de-energized, the Boiler Controller will revert back to
local
setpoint control. If Remote Set point operation will be
enabled
manually, select <HMI
Input>.
Remote Setpoint can then be
enabled,
by selecting the
<Remote>
button on the Firing Rate
Screen
.
If the PLC detects a bad analog signal, an alarm “Remote Setpoint Signal Failure” is activated and the Set
point revert to the LOCAL setting on the HMI.
Remote Set Point by Communications
This configures the Boiler Controller
to
receive a Remote Set Point signal directly by Communications
(Ethernet). Setpoint is written in engineering units. Communication integrity is determined by a
Communication Heartbeat signal between the Control System and the Building Management System. If a
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