Siemens 7ML19985AB01 instruction manual Operation, Memory, Security, Units

OPERATION

Upon power up, the transducer is fired periodically as set by P36. A long interval between measurements may be desirable in order to conserve power* when operating the OCM-3 from a DC source of limited capacity.

The echo is processed to determine the head (D0). The flow rate (D1) is calculated by the OCM-3 as a mathematical function (P3 and P4) of head or a function of head and velocity (P42). The flow rate is then integrated to yield the totalized flow (D2). The ‘Flow’ and ‘Total’ fields which are displayed during the normal running mode (F2) are also continuously updated.

Viewing or changing the content of a parameter (except F1, emulation) is done without disturbing the acquisition, processing or logging of flow data (see \ Security).

*restricted usage of display lighting (P14), relays (P15, 18 & 21), mA output and communications will also conserve power.

MEMORY

During a power interruption, the memory back up will hold the programming, the log and the totalizer values, and run the clock. The memory battery (B1) provides up to one year of memory retention (see Appendices \ Maintenance).

Note: To save parameter values, return to RUN mode (F2) after programming.

SECURITY

The content of all ‘A’, ‘D’, ‘F’, ‘P’ and ‘U’ parameters can be viewed without having to satisfy the security parameter, F0. However if it is desired to change the content of any of these parameters, the security parameter must be satisfied (except for resetting the running min/max displays, parameters D3/D4 and D6/D7).

Once security has been satisfied, access continues for 5 minutes after the last key is pressed or until F2 is re-entered.

The security code may be changed from its factory set value, 2.71828, by entering a new value into F10. It is imperative that the new value be recorded, as the code can not be viewed. If the code is lost, consult Milltronics.

UNITS

Programming of the OCM-3 involves setting the units of measure:

»P1 linear and velocity

»P2 temperature

»P5 flow rate and volume

If the units are changed during the course of operation, the change will be effected through all associated parameters and displays and will rescale flow and total data stored in the logs.

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