Externally Powered Current Based; Demand Limit - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

To configure this option with the Navigator™ display:
ITEM ITEM EXPANSION

Demand Limit

DMDC Configuration
Select
Switch Limit
DSL1 Setpoints
Setpoint 1
Switch Limit
DSL2 Setpoints
Setpoint 2
CUR.S Current Limit
Configuration
Select
Current Limit
CUR.F Configuration
at 100%
EXTERNALLY POWERED (4 to 20 mA) CAPACITY
BASED DEMAND LIMIT — The
Module is required for 4 to 20 mA demand limit control. An
externally powered 4 to 20 mA signal must be connected to
TB6-1 and TB6-2. To configure demand limit for 4 to 20 mA
control based on unit capacity, four parameters must be config-
ured. The parameters are: the type of Demand Limit Selection
(Demand Limit Type Select, DMDC), the current at which
100% capacity limit takes place (mA For 100% Demand
Limit, DMMX), the current at which 0% capacity limit takes
place (mA For 0% Demand Limit, DMZE), and the Current
Limit Selection (Current Limit Select, CUR.S).
CAUTION
Care should be taken when interfacing with other control
systems due to possible power supply differences such as a
full wave bridge versus a half wave rectification. Connec-
tion of control devices with different power supplies may
result in permanent damage. ComfortLink™ controls
incorporate power supplies with half wave rectification. A
signal isolation device should be utilized if the signal gen-
erator incorporates a full wave bridge rectifier.
To configure this option with the Touch Pilot™ display:
DISPLAY NAME PATH
Demand Limit 
Config USER
Type Select

mA For 100%
Config USER
Demand Limit
mA For 0% 
Config USER
Demand Limit
Current Limit 
Config USER
Select
To configure this option with the Navigator display:
ITEM ITEM EXPANSION
Demand Limit
DMDC Config
Select
mA for 100%
DMMX Config
Demand Lim
DMZE mA for 0%
Config
Demand Limit
Current Limit
CUR.S Config
Select
In the following example, a 4 mA signal is Demand Limit
100% and a 20 mA Demand Limit signal is 0%. The 4 to
PATH VALUE
SWITCH

RSET Default =
NONE
 Default =
MISC
100%
(Not required

for 1-Step)
MISC
Default =
100%

OPTN NO
Default: NO

Default =
OPTN
2000
Energy Management
LINE
VALUE
NO.
2 (4-20mA Control)
24
Default = 0 (None)
4.0 mA
28
Default = 0.0 mA
20.0 mA
29
Default = 10.0 mA
No
30
Default = No
PATH VALUE
 4-20MA INPUT
RSET
Default = NONE

4.0 mA
RSET
Default = 0.0 mA

RSET 20.0 mA
Default = 10.0 mA
 NO
OPTN
Default: NO
20 mA signal is connected to TB6-1 and TB6-2. The demand
limit is a linear interpolation between the two values entered. In
Fig. 28, if the machine receives a 12 mA signal, the machine
controls will limit the capacity to 50%.
EXTERNALLY POWERED (4 to 20 mA) CURRENT
BASED DEMAND LIMIT — The Energy Management
Module is required for 4 to 20 mA demand limit control. An
externally powered 4 to 20 mA signal must be connected to
TB6-1 and TB6-2. To configure demand limit for 4 to 20 mA
control based on compressor current, five parameters must be
configured. The parameters are: the type of Demand Limit
Selection (Demand Limit Type Select, DMDC), the current at
which 100% capacity limit takes place (mA For 100%
Demand Limit, DMMX), the current at which 0% capacity
limit takes place (mA For 0% Demand Limit, DMZE), the
Current Limit Selection (Current Limit Select, CUR.S), and
the Compressor Current limit at 100% signal (Current Limit
at 100%, CUR.F).
Care should be taken when interfacing with other control
systems due to possible power supply differences such as a
full wave bridge versus a half wave rectification. Connec-
tion of control devices with different power supplies may
result in permanent damage. ComfortLink controls incor-
porate power supplies with half wave rectification. A sig-
nal isolation device should be utilized if the signal
generator incorporates a full wave bridge rectifier.
To configure this option with the Touch Pilot display:
DISPLAY NAME PATH
Demand Limit
Config
Type Select
mA For 100%
Config
Demand Limit
mA For 0%
Config
Demand Limit
Current Limit
Config
Select
Current Limit
Config
at 100%
To configure this option with the Navigator display:
ITEM ITEM EXPANSION
DMDC Demand Limit
Select
mA for 100%
DMMX
Demand Lim
mA for 0%
DMZE
Demand Limit
CUR.S Current Limit
Select
Current Limit
CUR.F
at 100%
In the following example, a 4 mA signal is Demand Limit
for compressor current is 2000 amps and a 20 mA Demand
Limit signal corresponds with a compressor current of 0 amps.
The 4 to 20 mA signal is connected to TB6-1 and TB6-2. The
demand limit is a linear interpolation between the two values
entered. If the machine receives a 12 mA signal, the machine
controls will limit the total compressor current capacity to
1000 amps. See Fig. 29.
44
CAUTION
LINE
VALUE
NO.
 2 (4-20mA Control)
USER 24
Default = 0 (None)

4.0 mA
USER 28
Default = 0.0 mA
 20.0 mA
USER 29
Default = 10.0 mA
 Yes
USER 30
Default = No

USER 31 Default = 2000.0 Amps
PATH VALUE

RSET 4-20MA INPUT
Config
Default = NONE
 4.0 mA
Config RSET
Default = 0.0 mA
 20.0 mA
Config RSET
Default = 10.0 mA

OPTN YES
Config
Default: NO

Config OPTN Default = 2000