Watlow CPC400 Manual de usuario descargar pdf (Pagina 77)

CPC400 Series User’s Guide Chapter 3: Operation and Setup

Doc. 0600-2900-2000 Watlow Anafaze 63

• Heat power limit (if the heat output is used and 100%

power is not safe)

• Cool power limit (if the cool output is used and 100%

power is not safe)

How to Autotune a Loop

1. Go to the loop display (see Loop Display on page 50)

and press p to choose the loop to tune.

2. Enter the desired set point or one that is in the middle

of the expected range of set points that you want to

tune for. (See page 54.)

3. Set the control mode to tune. (See page 55.)

After the control mode on the loop display has switched to

adpt and stopped flashing, the PID parameters should be

close enough to provide good control. As long as the loop is

in the adaptive control mode, TRU-TUNE+™ continuously

tunes to provide the best possible PID control for the pro-

cess.

WARNING!

During autotuning, the controller sets the output

to 100 percent and attempts to drive the process

variable toward set point. Enter a set point and

heat and cool power limits that are within the safe

operating limits of your system.

Setting Up Alarms

The CPC400 has three main types of alarms:

• Failed sensor alarms

• Process alarms

• System alarms

Failed Sensor Alarms

Failed sensor alarms alert you if one of the following condi-

tions occurs:

• Thermocouple open

• Thermocouple shorted (must be enabled)

• Thermocouple reversed (enabled by default)

• RTD open positive input or open negative input

• RTD short between the positive and negative inputs

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Watlow CPC400 Manual de usuario Pagina 77