Omega Engineering DP3600 user manual Tare, Process Limits, Displaying, Resetting

TARE

Tare function is used for taking out a preset amount of process variable from the total reading e.g. if we are measuring weight of a certain product being put in a container but do not want the weight of the container to show on the display, then enter the weight of the container as tare value. The DP3600 unit will then automatically subtract the weight of the container from the total reading and display the weight of the product only.

Desired Tare is entered during SETUP procedure. Also, while entering Tare in SETUP, pushing the ‘TARE’ key will take the reading at that instant and store it as a new tare value.

DP3600 units also allow remote resetting of the TARE by using an external switch. This switch is connected between pins 13 and 14 on the rear connector. When ever the remote switch is activated, DP3600 will take the reading at that instant and store it as a tare value. As long as the switch is kept activated the unit will keep taking the reading as a new tare value.

For the remote switch to accept the reading as tare, the unit must be setup as such. This is done during the setup mode. Alternatively the same switch can be used to hold the display. Therefore, make sure that during setup when configuring tare/hold, the display must read 'RT TARE'.

LIMITS

Process Limits:

Displaying:

The LIMITS key is used for displaying Process Variable limits. Pushing the LIMITS key twice will briefly display PR LT1 (first push displays RATE) and then go on to show the process based limit 1 value. Each consecutive push there after will display ‘PR LT2’ and programmed limit 2 value, ‘PR LT3’ and its value, ‘PR LT4’ and its value. If limits 3 and 4 are configured as rate and deviation limits respectively, then the third push will display ‘rATE Lt’ followed by rate value and the fourth push will display ‘dEVn Lt’ followed by deviation limit value. The programming of process limits is done during setup procedure (look under SETUP).

Resetting:

Once energized, alarms can be reset in two different ways --- automatically or manually (non latching or latching). In non latching mode the alarm outputs will de-energize on their own when the process variable drops below the limit value. In the latching mode they stay energized even if the process variable drops below the limit. To reset the energized outputs in latching mode, first make the display indicate the limit that needs to be reset e.g. ‘PR LT2’, by pushing the ‘LIMITS’ key (as described above under ‘Displaying’). Next, while keeping the ‘LIMITS’ key pushed, go on to push the ‘RESET’ key. The respective alarm output will de-energize and the system will indicate so by displaying RLY RST. Selection of latching or non-latching mode for outputs is done during setup.

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