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44
Fig. 42 — Example: Space Temperature Reset
Demand Limit
There are three types of demand limiting that can be config-
ured. The first type is through switch control, which will re-
duce the maximum capacity to up to 3 user-configurable per-
centages. The second type is by 4 to 20 mA signal input which
will reduce the maximum capacity linearly between 100% at a
4 mA input signal (no reduction) down to the user-configurable
level at a 20 mA input signal. The third type uses the CCN
Loadshed module and has the ability to limit the current oper-
ating capacity to maximum and further reduce the capacity if
required. Demand limit control can be based on a calculated
capacity level. If the Demand Limit is enabled and the current
capacity requirement meets or exceeds the current Demand
Limit level, the unit will unload and display Override #9: De-
mand Limit section on page 48.
If the demand limit percentage is set below minimum unit op-
eration, the unit will go into override mode. See Override #91:
Demand Limit section on page 48.
SWITCH CONTROLLED DEMAND LIMIT
The control system is capable of demand limit based on a field-
supplied switch for 1-step demand limit or 2 switches for 3-step
demand limit. One-step demand limit is standard. The 2 or 3-step
switch control of demand limiting requires the EMM. Demand
limit steps are controlled By two relay switch inputs field wired to
TB5-5 and TB5-14 for Switch 1 (LIM_SW1) and TB6-14 and
TB6-15 for Switch 2 (LIM_SW2).
For demand limit by switch control, closing the first demand
limit contact (LIM_SW1) will put the unit on the first demand
limit (LIMIT 1) by capacity. The unit will not exceed the per-
centage of capacity entered as Demand Limit Switch 1 set point.
Closing contacts on the second demand limit switch
(LIM_SW2) and opening the Demand Limit Switch 1 prevents
the unit from exceeding the demand limit (LIMIT 2) entered as
Demand Limit Switch 2 set point. If both demand limit switch
(LIM_SW1 and LIM_SW2) contacts are closed the unit will not
exceed the limit (LIMIT 3) set by the switch limit set point 3.
See the table below.
To use demand limit, select the type of demand limiting to use
by configuring the Demand Limit Select variable (
Main Menu
Configuration Menu
General Configuration
Demand
Limit Type Select
) to Switch. Configure the demand limit set
points based on the type selected.
If using 2 or 3-step demand limit control, an energy management
module must be installed. The energy management module must
be enabled in the controls. To enable the EMM navigate to Fac-
tory Parameters menu
(Main Menu
Configuration Menu
Factory Parameters)
and set Energy Management Module to
YES (1).One-step demand limit control does not require the en-
ergy management module. To configure demand limit for switch
control, three parameters for 1-step switch control must be con-
figured. For 2 or 3-step control, additional set point parameters
must be configured. The parameters are: the type of Demand
Limit Selection, the setting for Switch Limit Setpoint 1, the set-
ting for Switch Limit Setpoint 2 (if required) and the setting for
Switch Limit Setpoint 3 (if required).
To configure this option with the Carrier Controller display:
In the following example, 2-step demand limit based on capac-
ity is desired with the first switch closure limiting the capacity
to 60%. The second switch closure is to limit the capacity to
40%. Demand Limit Switch 1 is 60% and Demand Limit
Switch 2 is 40%. Since no third-step demand limit is required,
Switch Limit Setpoint 3 is set at 0%.
0
1
2
3
4
5
6
7
5
7
0
7
5
6
0
6
8
0
S
pace Temperature (de
g
F)
De
g
ree
s
Re
s
et (de
g
F)
Cooling Re
s
et
Deg. V
a
l
u
e
(cr_deg)
S
p
a
ce T F
u
ll Re
s
et V
a
l
u
e
(
s
p
a
hr_f
u
)
S
p
a
ce T No Re
s
et V
a
l
u
e
(
s
p
a
hr_no)
a30-5884
CONTACT
ACTIVE DEMAND LIMIT
NONE
LIMIT 1
LIMIT 2
LIMIT 3
LIM_SW1
Open
Close
Open
Close
LIM_SW2
Open
Open
Close
Close
DISPLAY NAME
PATH
VALUE
Demand Limit
Type Select
Main Menu
Configuration Menu
General Configura-
tion
Default = 0 (None)
Range None = 0
Switch = 1
4 to 20mA = 2
Switch Limit
Setpoint 1
Main Menu
Setpoint Table
Default = 100%
Range 0 to 100%
Switch Limit
Setpoint 2
Main Menu
Setpoint Table
Default = 100%
Range 0 to 100%
(Not required for 1-Step Control)
Switch Limit
Setpoint 3
Main Menu
Setpoint Table
Default = 100%
Range 0 to 100%
(Not required for 1 or 2-Step Control)
DISPLAY NAME
VALUE
Demand Limit Type Select
1
Switch Limit Setpoint 1
60%
Switch Limit Setpoint 2
40%
Switch Limit Setpoint 3
0%
Summary of Contents for AquaForce 30XV140
Page 79: ...79 Fig 76 VFD Communication Wiring Compressor A B Fan VFD A1 A2 B1 B2...
Page 228: ...228 Fig 90 30XV Typical Field Wiring Schematic cont...
Page 229: ...229 Fig 91 30XV Standard Tier 140 275 All Voltages Power Schematic NOTE See Legend on page 226...
Page 230: ...230 Fig 92 30XV Standard Tier 300 325 All Voltages Power Schematic NOTE See Legend on page 226...
Page 240: ...240 Fig 99 30XV Communication Wiring...
Page 241: ...241 Fig 100 30XV 115V Control Wiring All Tonnages All Voltages...
Page 242: ...242 Fig 101 30XV 24V Control Wiring 30XV140 325 All Voltages...
Page 243: ...243 Fig 101 30XV 24V Control Wiring 30XV140 325 All Voltages cont...
Page 244: ...244 Fig 102 30XV 24V Control Wiring 30XV350 500 All Voltages...
Page 245: ...245 Fig 102 30XV 24V Control Wiring 30XV350 500 All Voltages cont...
Page 246: ...246 Fig 103 Component Arrangement Diagram for 30XV140 325...
Page 247: ...247 Fig 103 Component Arrangement Diagram for 30XV140 325 cont...
Page 248: ...248 Fig 104 Component Arrangement Diagram for 30XV350 500...
Page 337: ...337 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig L System Information...
Page 338: ...338 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig M Unit and Language Settings...
Page 341: ...341 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig P Data Input 2...
Page 342: ...342 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig Q Data Input 3...
Page 347: ...347 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig U Pump Wiring Diagram...