Operating instructions

44
To configure this option with the Navigator™ display:
EXTERNALLY POWERED (4 to 20 mA) CAPACITY
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 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).
To configure this option with the Touch Pilot™ display:
To configure this option with the Navigator display:
In the following example, a 4 mA signal is Demand Limit
100% and a 20 mA Demand Limit signal is 0%. 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. 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).
To configure this option with the Touch Pilot display:
To configure this option with the Navigator display:
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.
ITEM ITEM EXPANSION PATH VALUE
DMDC
Demand Limit
Select
Configuration
RSET
SWITCH
Default =
NONE
DSL1
Switch Limit
Setpoint 1
Setpoints
MISC
Default =
100%
DSL2
Switch Limit
Setpoint 2
Setpoints
MISC
(Not required
for 1-Step)
Default =
100%
CUR.S
Current Limit
Select
Configuration
OPTN
NO
Default: NO
CUR.F
Current Limit
at 100%
Configuration
OPTN
Default =
2000
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.
DISPLAY NAME PATH
LINE
NO.
VALUE
Demand Limit
Type Select
Config
USER 24
2 (4-20mA Control)
Default = 0 (None)
mA For 100%
Demand Limit
Config
USER 28
4.0 mA
Default = 0.0 mA
mA For 0%
Demand Limit
Config
USER 29
20.0 mA
Default = 10.0 mA
Current Limit
Select
Config
USER 30
No
Default = No
ITEM ITEM EXPANSION PATH VALUE
DMDC
Demand Limit
Select
Config
RSET
4-20MA INPUT
Default = NONE
DMMX
mA for 100%
Demand Lim
Config
RSET
4.0 mA
Default = 0.0 mA
DMZE
mA for 0%
Demand Limit
Config
RSET
20.0 mA
Default = 10.0 mA
CUR.S
Current Limit
Select
Config
OPTN
NO
Default: NO
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 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.
DISPLAY NAME PATH
LINE
NO.
VALUE
Demand Limit
Type Select
Config
USER 24
2 (4-20mA Control)
Default = 0 (None)
mA For 100%
Demand Limit
Config
USER 28
4.0 mA
Default = 0.0 mA
mA For 0%
Demand Limit
Config
USER 29
20.0 mA
Default = 10.0 mA
Current Limit
Select
Config
USER 30
Ye s
Default = No
Current Limit
at 100%
Config
USER 31 Default = 2000.0 Amps
ITEM ITEM EXPANSION PATH VALUE
DMDC
Demand Limit
Select
Config
RSET
4-20MA INPUT
Default = NONE
DMMX
mA for 100%
Demand Lim
Config
RSET
4.0 mA
Default = 0.0 mA
DMZE
mA for 0%
Demand Limit
Config
RSET
20.0 mA
Default = 10.0 mA
CUR.S
Current Limit
Select
Config
OPTN
YES
Default: NO
CUR.F
Current Limit
at 100%
Config
OPTN Default = 2000