5.2.15 Timer
An internal timer can be configured to operate in one of three different modes or types. These are Dwell Timer, Delayed Switch on Timer and Soft Start Timer. Event outputs (using outputs 1 to 4) may be configured to trigger when the timer is running or at the end of the timer sequence.
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P41 |
Select P41 to configure the Timer Type. |
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For further details see section 4.11 ‘Timer’. |
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nonE |
Timer disabled (factory default) |
d.LL |
Dwell at temperature. This may be used in combination with the setpoint ramp limit to provide a simple ramp/dwell temperature sequence, which may be used to control a process at a fixed temperature for a defined period. It is necessary to set a threshold level at which timing will start. This parameter is t.thr and is available in operator level 2. |
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dELy |
Delayed switch on timer. This timer is used to switch on the output power after a set time. It will start timing as soon as the controller is powered up or when it is manually set to RUN. The controller remains in standby with heating and cooling off until the time has elapsed. After the time has elapsed, the instrument controls at the target setpoint. This type of timer may be used to implement a switch on delay, and often eradicates the need for a separate timer device. |
SS |
Soft start timer. This provides a power limit before switch on. It starts automatically on power up, and applies a power limit ('SS.oP' set in Level 2) until the temperature reaches a set value ('SS.SP' set in Level 2). It is typically used, for example, to dry-out heaters in Hot Runner control systems before full power is allowed. |
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P42 |
Select P42 to configure Timer resolution. Not shown if P41 = none.
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For further details see section 4.11 ‘Timer’. |
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HoUr |
Hours HH:MM (factory default) |
Nin |
Minutes MM:SS |
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P43 |
Select P43 to configure Timer end type.
P43 is only applicable if the timer is a Dwell type.
P43 determines what action should take place when the timer has timed out. The Timer end event may be configured to operate an output, normally a relay.
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For further details see section 4.11 ‘Timer’. |
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oFF |
When the timer completes its dwell, the instrument will be put into Standby mode. The output power will be set to 0%, and the standard home display will display PV and OFF instead of setpoint (factory default). |
dLL |
When the timer completes, the controller will continue to control at setpoint.
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SP2 |
When the timer completes, the target setpoint will switch to setpoint 2. Setpoint 2 may be a lower or a higher temperature. If the setpoint rate limit is enabled, then the controller will ramp to the setpoint 2 at the SRL rate. During this ramp, the Timer status will indicate RUN. Once the setpoint 2 is reached the status will change to END. This can be used to provide a simple ramp/dwell/ramp/dwell sequence. |
rES |
The timer will reset on completion. It will revert to the setpoint used at the point it was started.
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