©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 9 - 61
9.43.1.4 Visibility of Associated Parameters
All existing XM controllers integrated in the Supervisory
Controller (for example, XM678) are modified to support
conditional visibility on parameters that are associated to the
XM Circuit. If an XM controller is associated with an XM circuit,
the XM controller application will hide the
associated parameters. If the XM controller application is not
associated to an XM Circuit application, all of its parameters
will be visible.
9.43.2 Suction Group Interaction
Circuits have specific interaction with suction groups. Similar
to the Case Circuit application, the XM Circuit application
interacts with both Standard and Enhanced Suction
applications.
9.43.2.1 Standard Suction
The XM Circuit can be associated to a standard Suction
Group application using the lookup (F4) function while
editing the Suction Group parameter.
9.43.2.2 Enhanced Suction
The XM Circuit can be associated to Enhanced Suction
Group applications. However, the association to Enhanced
Suction groups is performed from within the Enhanced
Suction group setup. When editing the Suction Group
parameter in the XM Circuit application, only Standard
Suction applications will be visible.
9.43.3 Supervisory Control Functions
The XM Circuit application provides supervisory control and
coordination of associated case controllers.
9.43.3.1 Dewpoint Value
When a dewpoint sensor is connected to the DEWPOINT
input of an XM Circuit application, the value of this sensor will
be sent to all associated XM case controllers. The dewpoint
value will be used by the XM case controllers to modulate the
anti-condensate heater, if equipped.
9.43.3.2 Lighting Control
The value present on the LIGHT SCHEDULE input of the XM
Circuit application will be sent to all associated XM case
controllers.
Lights During Defrost
If the Lts During Defr is set to ON, the XM case controller lights
will follow the schedule connected to the LIGHT SCHEDULE
input at all times. However, if Lts During Defr is set to OFF, the
XM case controller lights will be turned off during defrost
periods, regardless of the LIGHT SCHEDULE input.
9.43.3.3 Active Setpoint Output
When the USE DUAL STPT input is OFF, the XM Circuit will
use the Case Temp Stpt parameter as the active case
setpoint, which means the value of Case Temp Stpt will be
written to the ACTIVE SETPT output.
When the USE DUAL STPT input is ON, the XM Circuit will
switch over to using the “Dual Temp Stpt” parameter as the
active case setpoint, which means the value of Dual Temp
Stpt will be written to the ACTIVE SETPT output. All
associated XM case controllers will use the ACTIVE SETPT
from the XM Circuit as the current case
temperature setpoint.
Demand Setpoint Bump
If the PRI DEMAND SHED input is ON, the active setpoint will
be adjusted by the amount specified by the Pri Demand
Bump parameter.
If the SEC DEMAND SHED input is ON, the active setpoint will
be adjusted by the amount specified by the Sec Demand
Bump parameter.
If both the PRI DEMAND SHED and SEC DEMAND SHED
inputs are ON, the SEC DEMAND SHED will take priority.
9.43.3.4 Defrost Scheduling
The XM Circuit application provides defrost scheduling to the
associated XM case controllers.
Defrost Start Mode
Defrosts may be initiated with one of the following
methods - Numbered or Scheduled.
• Numbered - the starting time of the first defrost (called
Reference Time) is defined by the user and all the
subsequent defrosts are equally spaced out throughout
a 24-hour period. For example, if four defrosts are
specified with a reference time of 00:00, the remaining
three defrosts will begin at 06:00, 12:00, and 18:00. Up to
24 numbered defrosts may be specified.
• Scheduled - the absolute start time for each defrost is
specified by the user. Up to 12 scheduled defrosts may
be specified.
Days Between Defrost
The DaysBetweenDfr parameter specifies the number of days
to skip scheduled defrosts. This feature is useful for cases that
do not require a defrost cycle every day. If set to zero, defrosts
will occur every day. If set to one, defrosts will occur every
other day. If set to two, defrosts will occur every after two
days. The user may specify up to six days to skip defrosts.
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