Omega Engineering DP3600 Selection of Limit 4 as Process or Deviation Limit, Timers 1 and

Selection of Limit 4 as Process or Deviation Limit:

This step comes after programming Limit 3 and is indicated by the message ‘LT3 Pr’ (if Limit 3 is setup as Process limit) or ‘LT3 dEN’ (if Limit 3 is setup as deviation limit). Alternate selection can be made by pushing ^v key. Push SETUP key after making the selection.

Programming Limit 4:

As Process Limit:

If Limit 4, in the above step, was configured as a Process limit, then the message displayed on entering this mode will be ‘PrG Lt4’. This will be followed by displaying of current value of Limit 4 . Use <NXT> key to move flashing to the next digit and ^v key to increment/decrement the value of the flashing digit.

As Deviation Limit:

If Limit 4, in the above step, was configured as a Deviation limit, then the message displayed on entering this mode will be ‘dEVN Lt’. This will be followed by displaying of current value of Limit 4 . Use <NXT> key to move flashing to the next digit and ^v key to increment/decrement the flashing digit.

Timers 1 and 2:

This mode lets you enter values for timer 1 and 2. The display will read ‘TR1 LT’ (for timer 1 limit) and ‘TR2 LT’ (for timer 2 limit) followed by current programmed value of each of the timers. To change the value use <NXT> key in conjunction with the ^v key. Once done, push the SETUP key to go to the following parameter.

Relay Deadband:

The parameter programmed after timers is limit deadband. The display will first read "DEAD BD" and then show the value of previously programmed dead-band. To change the value of flashing digit, press ^v key. To move flashing digit, push <NXT> key. After programming the desired value of "dead-band" push ‘SETUP’ key to get to the next function.

Configuring Limits Normally open/Normally Closed:

Following relay deadband, the alarm outputs are configured as normally closed or normally open. This will be indicated as ‘LT1 N.O.’ ( if limit 1 is programmed as normally open) or ‘LT1 N.C.’ (if limit 1 is programmed as normally closed). To make an alternate selection, push the ^v key. After selecting or to retain current setting, push the SETUP key. The following three steps are similar to the last step and in it limits 2 through 4 are setup as normally open or normally closed.

Relay Latching/non Latching:

The next function is configuration of relays as latching or non-latching. In non-latching mode the relays will reset automatically when the Process variable drops below the programmed limit. In the latching mode once the relays are energized they have to be reset manually even though the process variable might have fallen below the limit ( latching/non-latching mode is only for process, rate and deviation limits). If the system is in latching mode the display will read ‘LATCH’. Alternately, the display will read ‘NON LCH’ (for "non latching"). To get the alternate mode push ^v key. To retain present mode push SETUP key.

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