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Temperature Controller: Direct/Reverse Operation

FAQ No. FAQ00618

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Question

What is the Controller's "direct/reverse operation" and how is it set on the E5[]N?

Answer


1. Direct/Reverse Operation


(1) Direct operation performs control so that the manipulated variable is increased when the process value increases. Reverse operation performs control so that the manipulated variable is increased when the process value decreases.

(2) Set direct operation for cooling control (e.g., control so that the output is turned ON when the temperature is higher than the set point, such as for a refrigerator). Set reverse control for heating control (e.g., control so that the output is turned ON when the temperature is lower than the set point, such as for an oven).

(3) The factory default setting is for reverse control.

2. Setting Method for the E5[]N


(1) Press the Level Key for at least three seconds from the Operation Level display that appears after the power supply is turned ON. The Initial Setting Level will be entered. (Fig-1)

The Initial Setting Level cannot be entered if the Initial/Communications Protection in the Protect Level (icpt) is set to 2. If necessary, clear protection before starting this procedure.

"oreV" will be displayed on the top display (i.e., the PV display) and or-r or or-d will be displayed on the bottom display (i.e., the SV display).

Reverse operation will be used if or-r is displayed on the bottom display and direct operation will be used if or-d is displayed on the bottom display. (Fig-2)

(2) Switching between Direct and Reverse Operation

Switching between direct and reverse operation is performed with the Up and Down Keys. (Fig-3)

Note: If the power to the Controller is turned OFF immediately after changing a setting, the new setting will not be saved. After changing a setting with the Up or Down Key, wait for at least two seconds or press the Mode Key to confirm the setting.

(3) Press the Level Key for at least one second to return to Operation Level.

Applicable Models: E5AN,E5EN,E5CN,E5GN