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Feature
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Configuration Tables |
Wiring |
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Zone Setpoint SchedulerZSS/PTR/LCD/.../...
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Main FeaturesThe zone controller creates a Setpoint or setpoint Trim dynamically calculated from other system variablesZone Setpoint can be Scheduled Based on Outside Temperature Rescaling Based on Heat and Cool demand |
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Summary Features
This is a special version of a Master Zone which allows the Zone setpoint to be modified by external networked parameters. The modified setpoint can be sent to any module normally supervised by a Zone, or can be used to update any configuration variable on any module.
ReScaling
The ReScale block has an input range and an output range, if the input value is below the minimum input value then the output will be equal to the output minimum value, similarly if the input value is above the input maximum value then the output will be the output maximum value. For any input value which falls within the input range the output will be calculated to be the same proportion of the output range. Input values greater than the maximum input will produce an output equal to the output maximum value.
The output range can be inverted so that an increasing input produces a decreasing output.
The Zone Scheduler uses the Zone ‘User Parameters’, normally
Outside Temperature and Flow Temperature as the input variables for the ReScale
blocks. As in a standard Zone these parameters can be set to read any parameter
in any module on the system, so they may be set to read say the heat and cool
demands of secondary controllers.
Each User Parameter is fed to two rescale blocks; this is to allow separate positive and negative setpoint trim values to be calculated.
Example Changing a Setpoint based on Outside Temperature
For User Parameter 1 equal to Outside Temperature
As the Outside temperature changes from 22 to 30 the setpoint trim will change from 0 to 2, the trim value is calculated to the nearest 0.1. The configuration parameters can be found starting at C180.
The negative trim can be calculated using block B
As the Outside temperature falls from 10 to 5 then the setpoint
trim will change from 0 to -2 degrees. Each block has an enable parameter
which must be set to 1 to include the block output into the setpoint calculation.
The output of the rescale blocks are normally (CALC=0) summed with the mid point setpoint, thus a new trimmed setpoint is produced. So in the above example if the Outside temperature was 26 degC and the Zone’s mid point setpoint was 20 degC the setpoint sent to the AHU or Fan Coils would be 20+ 1 (26 is halfway between 22 and 30 so I degree elevation is applied)
Absolute setpoints or set values can be
calculated by setting CALC=1 maximum or CALC=2 minimum, in these cases the
mid point setpoint is ignored and the maximum or minimum of the values calculated
in the re-scale block or blocks is passed directly to the designated network
variable.
ReScaling based on Heat and Cool demands
Set User Parameter 1 to the Heat demand on the correct Heat Source
Set User Parameter 2 to the Cool Demand on the correct Cool
Source
Set Block A
AIMN =0, AIMX 100, AOMN 0, AOMX 5.0, AENB=1
Set Block B
disabled BENB=0
Set Block C
CIMN=0, CIMX=100, COMN=0, COMX=-5.0, CENB=1
If demand is negative set parameters to
CIMN =-100, CIMX =0, COMN=-5, COMX=0, CENB=1
Set Block D
disabled DENB=0
Set Calculation mode to SUM
Set Mid point setpoint using Knob
1, set adjustment range etc to limit user adjustments
As heating demand increases from 0 to 100% the setpoint
will change from mid point setting to mid point +5 degrees.
Similarly as Cooling demand increases the setpoint
will be reduced by 5 degrees.
Set up setpoint slaving in the normal manner. Note the setpoint
supervision is only active when the Zone is occupied so the normal Time Zones
etc should be set as normal. Optimum start and stop can also be utilised if
the Zone measured temperature is appropriate, otherwise the Optimum start
and stop range should be set to zero so that the Occupancy follows the set
times.
Setting the Destination of the Setpoint (Output Variable)
Setpoint Supervision
The receiving module is registered to the Zone in the normal
manner, put the Zone into configuration mode and press the register button
on the receiving module. Multiple modules may be set to receive the setpoint.
Configuration Variable Update
The Output variable can be written to any configuration parameter on any module in the system. The address of the target configuration variable is stored in the Zone using configuration variables C149, C150, C151 to set subnet, node and configuration number respectively. These can be set automatically using the Zone to browse to find the correct variable in a similar manner to setting the User Variables.
To set Remote Target variable
· Press and hold select + override buttons on the Zone until status lamp flashes (Zone in Config mode)
· Press select on Target module
· Press and hold select on the Zone Controller
· Rotate Knob clockwise until the target parameter is displayed
· Release select button
· Press day and time buttons together
· A tick symbol will appear on the display
· The target parameter will be updated approximately every minute with the Scheduled Setpoint value.
To cancel the setting
· Press and hold select + override buttons on the Zone until status lamp flashes (Zone in Config mode)
· Press day and time buttons together
· The Zone will briefly display RSET to indicate that the setting has been cancelled
Changes to normal Zone Controller functions
The Zone controller retains all normal functionality except as listed here.
Demand Collation removed
The ability of the the Zone to integrate the cumulative heating and cooling demands has been removed to allow for Setpoint Scheduler features.
Zone Setpoint Scheduled
If the ReScale blocks are used to produce a Trim to the Zone’s own setpoint (CALC=0) then the resulting mid point setpoint is also applied to the Zone itself. Once the new mid point setpoint has been calculated then the deadband is applied to create separate heating and cooling setpoints. The current heating or cooling setpoint is reported on sensor 3 as REQD.
If CALC is not zero then the Zone’s own setpoint is not affected by the schedule function.
Configuration Variables for setting ReScale Function
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InSite code |
Label |
Description |
Units |
Default |
Range |
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C172 |
USR1 |
Value of User Variable 1 |
- |
- |
- |
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C173 |
USR2 |
Value of User Variable 2 |
- |
- |
- |
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C174 |
SCHA |
Output of ReScale Block A |
- |
- |
- |
|
C175 |
SCHB |
Output of ReScale Block B |
- |
- |
- |
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C176 |
SCHC |
Output of ReScale Block C |
- |
- |
- |
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C177 |
SCHD |
Output of ReScale Block D |
- |
- |
- |
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C178 |
SCSP |
Scheduled Setpoint, output of CALC Block |
- |
- |
- |
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C179 |
CALC |
Calculation Mode 0. Sum Output values from all enabled ReScale Blocks with the Zone mid point setpoint 1. Output is the Maximum of the enabled ReScale Blocks 2. Output is the Minimum of the enabled ReScale Blocks |
- |
0 |
0 to 1 |
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C180 |
AIMN |
ReScale Block A; minimum input range |
- |
0 |
-100 to 100 |
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C181 |
AIMX |
ReScale Block A; maximum input range |
- |
0 |
-100 to 100 |
|
C182 |
AOMN |
ReScale Block A; maximum output range |
- |
0 |
-100 to 100 |
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C183 |
AOMX |
ReScale Block A; maximum output range |
- |
0 |
-100 to 100 |
|
C184 |
AENB |
ReScale Block A enable |
- |
0 |
0 to 2 |
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C185 |
BIMN |
ReScale Block B; minimum input range |
- |
0 |
-100 to 100 |
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C186 |
BIMX |
ReScale Block B; maximum input range |
- |
0 |
-100 to 100 |
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C187 |
BOMN |
ReScale Block B; maximum output range |
- |
0 |
-100 to 100 |
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C188 |
BOMX |
ReScale Block B; maximum output range |
- |
0 |
-100 to 100 |
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C189 |
BENB |
ReScale Block B enable |
- |
0 |
0 to 2 |
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C190 |
CIMN |
ReScale Block C; minimum input range |
- |
0 |
-100 to 100 |
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C191 |
CIMX |
ReScale Block C; maximum input range |
- |
0 |
-100 to 100 |
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C192 |
COMN |
ReScale Block C; maximum output range |
- |
0 |
-100 to 100 |
|
C193 |
COMX |
ReScale Block C; maximum output range |
- |
0 |
-100 to 100 |
|
C194 |
CENB |
ReScale Block C enable |
- |
0 |
0 to 2 |
|
C195 |
DIMN |
ReScale Block D; minimum input range |
- |
0 |
-100 to 100 |
|
C196 |
DIMX |
ReScale Block D; maximum input range |
- |
0 |
-100 to 100 |
|
C197 |
DOMN |
ReScale Block D; maximum output range |
- |
0 |
-100 to 100 |
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C198 |
DOMX |
ReScale Block D; maximum output range |
- |
0 |
-100 to 100 |
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C199 |
DENB |
ReScale Block D enable |
- |
0 |
0 to 2 |
Zone Setpoint Scheduler
ZSS / PTR / LCD / [option] / [colour] (master types)
Options
Option |
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/ 001 / |
With internal sensor, provision for 1 remote sensor or override device |
/ 003 / |
With no internal sensor, for use with 2 remote sensors or 1 remote sensor and an override device |
Colour Options
Option |
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/ G |
Grey housing |
/ W |
White housing |
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Input Configuration |
Input 3-4 |
Remote sensor or external VFC override (optional) |
Input 5-6 |
Remote sensor (optional, for / 003 types only) |