I.C.E. HTDM Food Process Unit User Manual

Page 15

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3) External Modulation Control

The ICECON II controller is capable of responding to a 0-10Vdc or
4-20mA signals. To configure the ICECON II controller to respond

to an external signal the RSP and Mod/std check boxes (In the
software interface) must not be checked. The control signal
connects to terminals J3-25 and J3-26. The ICECON II controller
will remain in control of errors and will lock out if any error
condition occurs. The BMS has complete control over the discharge

The BMS supplier must supply the ICECON controller with either 0-
10 VDC or 4-20 ma signal. The signal is to be supplied to
terminals J25 and J26. After normal startup sequence is finished
the auto led will remain de-energized. The unit will now only
respond to the BMS signal and is unable to self adjust to changes
in conditions.

The ICECON II controller will respond to the incoming signals and
modulate to a corresponding firing rate. The firing curve is
composed of discrete steps. Each step is controlled by a trigger
voltage or current that once reached the combustion will move to
the next combustion step. When tuning a the BMS system the
following points must be consider:

How the ICECON II Controller Responds to External Modulation

The ICECON II controller automatically scales the incoming signal
to the internal combustion curve that has been programmed at the
factory. The curve is made of discrete steps. There are dead-
bands in the signal in which the unit will not modulate with an
increase or decrease in the control signal.

Once a signal is received the controller will modulate to the
corresponding firing point. During this transition the ICECON II
controller will not respond to changes in the control signal. As
a result the Control system must be tuned for a very slow
response. Poor temperature control will result if the system is
not tuned correctly.