Eurotherm 3216i User's Guide download pdf (Page 23)

3216 User Guide Part No. HA027985ENG Issue 2.0 May 04

ENG

5.4.3 Auto/Manual/Off Mode

Auto mode is the normal closed loop operation where the output is adjusted automatically by the controller in response

to a change in the input signal.

Manual mode means that the controller output power can be adjusted directly by the user. The input sensor is still

connected and reading the PV but the control loop is open. The current level of the power output is adopted at the

point of switch over from Auto to Manual. This is referred to as ‘Bumpless Transfer’. The power output can be increased

or decreased using the

▼

▲

buttons. Similarly, when Manual to Auto is selected the current manual output

power is taken and the controller will then take over control. If the controller is powered down it will resume the same

mode when powered up again.

Off mode can be selected or when using a timer configured to turn the power output off at the end of a timed period.

Manual operation must be used with care and the power level set must be chosen such that no damage can occur

to the process. The use of a separate ‘over-temperature’ controller is recommended.

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Eurotherm 3216i User's Guide Page 23