Carrier 30RAP010-060 specifications 4 to 20-mADemand Limiting, Cooling Set Point 4 to 20 mA

Models: 30RAP010-060

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Fig. 21 — 4 to 20-mA Demand Limiting

DEMAND LIMIT (CCN Loadshed Controlled) — To con- figure Demand Limit for CCN Loadshed control set the De- mand Limit Select (ConfigurationRSETDMDC) to 3. Then configure the Loadshed Group Number (Configura- tionRSETSHNM), Loadshed Demand Delta (Configu- rationRSETSHDL), and Maximum Loadshed Time (ConfigurationRSETSHTM). See Table 27.

The Loadshed Group number is established by the CCN system designer. The ComfortLink controls will respond to a Redline command from the Loadshed control. When the Redline command is received, the current stage of capacity is set to the maximum stages available. Should the loadshed con- trol send a Loadshed command, the ComfortLink controls will reduce the current stages by the value entered for Loadshed Demand delta. The Maximum Loadshed Time is the maximum

length of time that a loadshed condition is allowed to exist. The control will disable the Redline/Loadshed command if no Cancel command has been received within the configured maximum loadshed time limit.

Cooling Set Point (4 to 20 mA) — A field supplied and generated, externally powered 4 to 20 mA signal can be used to provide the leaving fluid temperature set point. Connect the signal to LVT7,8 (+,–). See Table 27 for instructions to enable the function. Figure 22 shows how the 4 to 20 mA sig- nal is linearly calculated on an overall 10 F to 80 F range for fluid types (ConfigurationOPT1FLUD) 1 or 2. The set point will be limited by the fluid (FLUD) type. Be sure that the chilled water loop is protected at the lowest temperature.

 

100

 

 

 

 

 

 

 

 

50% CAPACITY AT 20 mA

 

 

 

 

 

 

 

 

 

 

 

 

(%)

 

 

 

 

 

 

 

 

 

 

 

 

LOAD

80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALLOWABLE.MAX

60

 

 

 

 

 

 

 

 

 

 

 

40

100% CAPACITY AT 4 mA

 

75% CAPACITY AT 12 mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

0

0

2

4

6

8

10

12

14

16

18

20

 

 

 

 

 

 

DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT

 

 

 

Fig. 21 — 4 to 20-mA Demand Limiting

 

100

 

 

 

 

 

 

 

 

(38)

 

 

 

 

 

 

 

 

90

 

 

 

 

 

 

 

 

(32)

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

(27)

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

(21)

 

 

 

 

 

MAXIMUM

 

 

 

 

 

 

 

 

SET POINT

 

 

60

 

 

 

 

 

70 F (21.1 C)

 

F (C)

(15)

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

POINT,

 

 

 

 

 

 

 

(10)

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

SET

 

 

 

 

 

 

 

(4.4)

 

 

 

 

 

 

 

 

 

 

(FLUD = 1) MINIMUM

 

 

 

 

 

 

 

 

 

 

 

30

 

 

SET POINT 38 F (3.3 C)

 

 

 

 

(-1)

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

(-7)

 

 

 

 

 

 

 

 

10

(FLUD = 2) MINIMUM

 

 

 

 

 

 

 

SET POINT 14 F (-10 C)

 

 

 

 

 

 

(-12)

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

(-17)

 

 

 

 

 

 

 

 

4

6.3

8.6

10.9

13.1

15.4

17.7

20

4 TO 20 mA SIGNAL TO EMM

EMM — Energy Management Module

Fig. 22 — Cooling Set Point (4 to 20 mA)

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Carrier 30RAP010-060 specifications 4 to 20-mADemand Limiting, Cooling Set Point 4 to 20 mA