Chromalox 2104 Dokumentacja Pobierz pdf (Strona 58)

Chromalox 2104 Technical Manual 53

The timer setting should be chosen according to the

response time of the system. The minimum time seting

should be 0.25% of span divided by the normal load

response rate to full ON or full OFF condition

(whichever is slower).

Example: For a controller with type J T/C (span -100°F

to 1400°F), 0.25% of span is 3.75°F. If the heating

response is 2°F/min., and the cooling response is 1°F/

min., the minimum Loop Timer setting would be 3.8

minutes. To prevent false alarms, it is recommended that

you start by doubling the setting to 7.6 minutes.

The CLP Alarm sequence begins when the control

output reaches 0.0% or 100.0% (process variable outside

of the proportional band). The controller then measures

the time for the process variable to respond (increase or

decrease the process variable) and compares the

measured time to the Loop Timer value.

Control Loop Protection Alarm (CLP)

Control Loop Protection (CLP) monitors the

controller’s process variable input and load output to

detect and respond to conditions indicating a failure in

the control loop (Sensor, Controller Output, Load or

Process flow). CLP is selected by setting the LOOP Timer

on the CTRL PAGE menu to a value from 0.1 to 999.0

minutes (0.0 disables CLP).

TRLTRL

TRL

GEGE

AUX ▲▼

RESET

OOPOOP

OOP

120.0 120.0

120.0

AUX ▲▼

RESET

➮

Loop Timer

Time (in minutes)

☛

Minimum Timer Setting = Span x .0025

Slowest Response Rate (Heat or Cool)

Response Rate = Process Response (in degrees/minute) when

100% ON or 100% OFF

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