• all of the parameters can be edited
• standard average maximums / minimums, electricity meter energies ΣEP+, ΣEP-, etc., and electricity meter
maximum power demand ΣMD can be cleared
After being put in operation, such operations can be locked (=disabled) to protect the instrument against unauthorized
changes. Then operator can only check measured values and parameters, but cannot change anything, excluding special
parameter No. 00, that serves as the instrument lock. It has one of two values :
L O C ....... instrument is locked
O p n ....... instrument is unlocked (open)
If the instrument is locked, you can unlock it using the following procedure, which is similar to editing of other parameters:
1. Press the key and scroll to parameter group 00 with arrow keys – value L O C is displayed.
2. Press the and hold it down until the value is replaced with flashing number between 0 0 0 and 9 9 9. As
an example, you can imagine flashing 3 4 5 is displayed.
3. Press the following sequence: , , , . The value changes gradually to 3 4 4, 3 4 5, 3 4 6,
3 4 5, so the same value is shown at the end as at the beginning.
4. Press the . The flashing number is replaced with O P n, indicating unlocked state.
The digit shown while entering the unlocking keypress sequence is random and it is not important for correct unlocking (it is
there only to confuse). Only the sequence of keys pressed is important and must be followed exactly.
The instrument can be locked in a way analogous to unlocking but it is necessary to press any keypress sequence that is
different from the unlocking sequence noted above.
2.11 Display Contrast
Although the display contrast is temperature compensated, there can be sometimes necessary to tune it slightly. Press keys
and simultaneously and keep pressed. Then message C O n appears in the first line and the contrast value in the
second one. Now, if the display too light, keep the pressed and increase with repetitive pressing of the key.
Likewise, if too dark, keep the and adjust with the key. Finally, release the keys and new contrast is set.
2.12 Digital Outputs & Input
Instruments can be optionally equipped with a combination of outputs and inputs.
Following inputs & outputs are available :
● digital relay output (electromechanical), marked as ROx (x =output number)
● digital solid state output (semiconductor), DOx
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