STULZ CyberRow DX Series Installation, Operation & Maintenance Manual
4.6 Communication With The Controller
It is possible for the
E²
controller to communicate in
multiple ways. The controller may be set up to utilize a
pLAN network to link with additional
E²
controllers to
create a work group consisting of multiple A/C units (see
Section 4.6.1).
Using an expansion card, the unit may also be connected
to a BMS for monitoring and control of data points using
a variety of different serial communication protocols (see
Section 4.7).
Figure 18- Confi guring Multiple A/C Units
Up to 8
E²
Series
Controllers in
Work Group
A/C Unit #2
Control
Variables From
BMS
Lead
Controller-
A/C Unit #1
Temperature Sensor*
Humidity Sensor*
A/C Units
#3 - #8
pLAN
Connection
* Proportional Input
Signals From Sensors
or BMS Analog Output.
Temperature Sensor*
Humidity Sensor*
Temperature Sensor*
Humidity Sensor*
4.6.1 Work Group Set-up
The controller may be networked with a group of A/C
unit controllers to manage their outputs as a system
in an N+M (M = number of standby units) group. The
controllers from up to seven additional A/C units may
be tied to a Lead controller. The number of units to be
assigned as Active, Capacity Assist or Standby duty is to
confi gured by the factory however, they may confi gured
in the fi eld with assistance from STULZ Product Support.
A unit may also be designated as "Out of Service".
The Main screen of each unit in the work group will
indicate that unit's duty assignment in the bottom fi eld. If
the controller is the group Lead, it will be indicated in the
bottom fi eld also.
01/01/09 00:00:00
00.0°F
00%rh
Dp 00.0°F
Unit On
ACTIVE
Lead
Multiple Unit Display Screen
One controller may be designated as the work group lead
and networked with the controllers from a series of up to 7
additional A/C units. If confi gured for multi-unit operation,
the work group lead controller display panel allows access
to the same data and group control sensor choices that
are available from networked system controller display
panels.
4.6.1.1 Standby
If the lead controller in the work group loses a signal
acknowledgement from an active A/C unit in the group,
that A/C unit is deemed as failed or taken out of service.
The failed unit will be replaced with the fi rst available
standby unit from the work group. The standby unit is
cycled on and designated as the new active unit.
4.6.1.2 Capacity
Assist
The Capacity Assist option can be used to maximize
effi ciency for conservation of energy and to more precisely
control capacity at low demand. This feature enables
Active A/C units to handle the demand up to a certain
temperature/humidity setpoint and then enables additional
units to begin operating as needed. If the Active A/C units
are running and unable to satisfy the demand, Capacity
Assist A/C unit(s) may be programmed to turn on to assist
the Active units.
Each Capacity Assist unit may set to control operation
based on it’s local temperature/humidity sensor values
or control operation based on Network sensor values
transmitted from the Lead controller. Multiple Capacity
Assist units are typically set with each unit in the group
assigned incrementally increasing/decreasing offsets for
cooling, humidifying and dehumidifying so they will turn
on one at a time only if the unit(s) currently operating are
unable to satisfy the demand. They should incrementally
turn off as each unit reaches it's cut-out setpoint, while
active A/C unit(s) continue to maintain room conditions at
the desired level.
4.6.1.3 Unit
Rotation
In this mode, the Lead controller will rotate duty between
the grouped A/C units to promote equal run time and
will rotate the role of group lead. When set up for unit
rotation, the A/C units will rotate duty in order of their
group addresses. Active, Capacity Assist and Standby
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Содержание CyberRow DX CRS-042-G
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