M&M
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EFRIGERATION
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. 5-3
Chapter 5: Technical Overview
Override Discrete I/O (Option)
The Override Discrete I/O screen allows the user to set the state of certain discrete
outputs. It also allows the user to simulate certain discrete inputs to an active or inac-
tive state. This feature is for diagnostics purposes only and will only function if the
system is off-line. Please note that the user is responsible for knowing the conse-
quences of manual control actions.
Setup Menu
The Setup menu allows the user to perform miscellaneous setup changes, which are used
to configure the system.
Set Date and Time
The Set Date and Time screen allows the user to enter the current day and date. The
system clock may be set to a 12 or 24 hour mode.
NOTE: If the time is set on a Master panel, all the clocks on the lower-level network panels
will also be set. The correct hour, minute and second for the current time must be
entered as 24 hour time.
Calibrate Sensors
Two types of calibration can be accomplished using the Dynamic or Static Sensor Cal-
ibration options. Dynamic Sensor Calibration is selected when the user wishes to
change current sensor range values. Static Sensor Calibration is selected to recall
sensor calibration values after a return to factory configuration or after a system soft-
ware or hardware change, which would effect sensor calibration.
Dynamic Sensor Calibration
Dynamic Sensor Calibration is the process of adjusting the readings of the CCS
analog sensors to remove small inaccuracies. The calibration process is per-
formed from the Dynamic Sensor Calibration screen. The approach used for
dynamic calibration divides the sensor range into three zones. When the value
being calibrated is in the upper zone (above 66%) the upper range limit is allowed
to change by a maximum of 5% and the lower range limit remains constant. This
is referred to as a span change. When the value being calibrated is in the lower
zone (below 33%) the lower range is allowed to change by a maximum of 5% and
the upper range remains constant. This is referred to as an offset change. When
the value being calibrated is in the middle zone (33% to 66%) both end points are
allowed to move a maximum of 5% (typical) resulting in both a span and offset
change. For best results calibration should be performed both at the operating
value and at or near the lower limit. Several calibration attempts may be required
to zero-in on the correct values over the full operating range.
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