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CPC400 Series User’s Guide Chapter 5: Menu and Parameter Reference

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Ratio Low Set Point

Enter the lowest allowable set point for the current loop.

The set point will never drop below this value, regardless of

the result of the ratio calculation.

Values: For a thermocouple or RTD input, any value with-

in the input range (see Table 5.7 on page 104). For a pro-

cess or pulse input, any value between the Input range low

and Input range high parameters. This value must be less

than the Ratio high SP parameter.

Default: 25 (or 0 for the pulse input)

Modbus Address (Loops 1 to 9): 44767 to 44775

Parameter Number: 106

LogicPro Driver: Database

LogicPro Address (Loops 1 to 9): 106.1 to 106.9

Decimal Placement for Modbus or LogicPro: See Dec-

imal Placement for Numeric Values on page 80.

Ratio High Set Point

Enter the highest allowable set point for the current loop.

The set point will never exceed this value, regardless of the

result of the ratio calculation.

Values: For a thermocouple or RTD input, any value in the

input sensor range; see Table 5.7 on page 104. For a pro-

cess or pulse input, any value from Input range low to Input

range high. This value must be greater than the Ratio low

SP parameter.

Default: 25 (0 for the pulse input)

Modbus Address (Loops 1 to 9): 44784 to 44792

Parameter Number: 107

LogicPro Driver: Database

LogicPro Address (Loops 1 to 9): 107.1 to 107.9

Decimal Placement for Modbus or LogicPro: See Dec-

imal Placement for Numeric Values on page 80.

Control Ratio

Enter the factor by which to multiply the process variable

of the master loop to calculate the set point of the ratio loop.

Values: .1 to 999.9 (1 to 9999). Values in parentheses are

for serial communications and LogicPro (values are in

tenths).

Default: 1.0 (10) for a thermocouple, RTD or process input;

.0 (0) for a pulse input

Modbus Address (Loops 1 to 9): 44801 to 44809

Parameter Number: 108

LogicPro Driver: Database

LogicPro Address (Loops 1 to 9): 108.1 to 108.9

l01 Ratio low r

SP b 25 ˚F

l01 Ratio high r

SP b 25 ˚F

l01 Control r

ratio b 1.0

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