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In the following example, 2-step demand limit based on
capacity 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%.
TOUCH PILOT DISPLAY
Display Name
Demand Limit Type Select
Switch Limit Setpoint 1
Switch Limit Setpoint 2
Current Limit Select
Switch Controlled (Current Based) — If using 2-step de-
mand limit control, an energy management module must be
installed. One-step demand limit control does not require the
energy management module. Four parameters for 1-step switch
control must be configured. For 2-step control, five parameters
must be configured. The parameters are: the type of Demand
Limit Selection (Demand Limit Type Select, DMDC), the
setting for Switch Limit Set Point 1 (Switch Limit Setpoint 1,
DLS1), the setting for Switch Limit Set Point 2 (Switch Limit
Setpoint 2, DLS2), the Current Limit Select (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:
DISPLAY NAME
PATH
Demand Limit
Config
USER
Type Select
Switch Limit
Setpoints
SETPOINT
Setpoint 1
Switch Limit
Setpoints
SETPOINT
Setpoint 2
Current Limit
Config
USER
Select
Current Limit
Config
USER
at 100%
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
Current Limit
CUR.S
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).
NAVIGATOR DISPLAY
Value
Item
Value
1
DMDC
SWITCH
60%
DSL1
60%
40%
DSL2
40%
No
CUR.S
NO
LINE
VALUE
NO.
1 (Switch Control)
24
Default = 0
(None)
33
Default = 100%
(Not required
34
for 1-Step)
Default = 100%
Yes
30
Default = No
Default =
31
2000.0 Amps
PATH
VALUE
SWITCH
RSET
Default =
NONE
Default =
MISC
100%
(Not required
for 1-Step)
MISC
Default =
100%
NO
OPTN
Default: NO
Default =
OPTN
2000
energy
management
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
Demand Limit
Config
Type Select
mA For 100%
Config
Demand Limit
mA For 0%
Config
Demand Limit
Current Limit
Config
Select
To configure this option with the Navigator display:
ITEM
ITEM EXPANSION
Demand Limit
DMDC
Select
mA for 100%
DMMX
Demand Lim
mA for 0%
DMZE
Demand Limit
Current Limit
CUR.S
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
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. 24, 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
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:
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%
40
CAUTION
PATH
LINE NO.
VALUE
2 (4-20mA Control)
USER
24
Default = 0 (None)
USER
28
Default = 0.0 mA
USER
29
Default = 10.0 mA
No
USER
30
Default = No
PATH
4-20MA INPUT
Configuration
RSET
Default = NONE
Default =
Configuration
RSET
0.0 mA
Default =
Configuration
RSET
10.0 mA
NO
Configuration
OPTN
Default: NO
energy
management
LINE NO.
VALUE
2 (4-20mA Control)
USER
24
Default = 0 (None)
USER
28
Default = 0.0 mA
USER
29
Default = 10.0 mA
Yes
USER
30
Default = No
USER
31
Default = 2000.0 Amps
VALUE
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