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The "power supply" terminal strip is the first on the left-hand side. The power supply must coincide with that written
on the instrument's label with a maximum drift of 10%. The two relay outputs can be found on the second
terminal strip, the K1 contact at terminals 4 and 5, K2 at terminals 6 and 7. The current outputs are situated on the
third terminal strip; output 1 at terminals 8 (+) and 9 (-); output 2 at terminals 10 (+) and 11 (-). The farthest right-
hand terminal strip is reserved for the input and is therefore specific according to the type of measurement being
carried out. Further information can be found in the specific addendums.
NOTES :
1)
Exchanging supply phase with neutral means only having the internal protection PTC connected to neutral
instead of phase. This does not affect the correct operation of the µP 97. The power supply earth (terminal 18)
must be connected to the earth of the electric plant. This connection is not compulsory for meeting safety standards
but is indispensable for avoiding any electromagnetic disturbance from the power line.
3)
Information regarding the connection of input signals (terminals 12 to 16) is available in the specific
addendums for each parameter. In any case, the signal cables must be kept separate from the power cables.
4)
The max. load on the relay outputs is 3A at 250VAC resistive. With an inductive load, the maximum current
goes down to 1A (with power supply 220VAC, pumps and electrovalves with power up to 200VA can be piloted
directly). The output relay contacts are not protected. It is necessary to install a fuse or other protection system in
accordance with the load.
6)
In case of inductive loads, the outputs must be protected with suitable arc and disturbance suppression
systems (RC nets or varistors if in AC, diodes or varistors if in DC). The relay contacts of the µP 97 are internally
protected by a 275 VAC varistor. A suitable suppressor must be chose by the installer in accordance with the
load/power supply.
7)
In order that the instrument is able to work correctly even in the worst working conditions, we advise the
following to be done :
a) radiofrequency blankers should be fitted to the power cable;
b) the signal cable must be shielded with an earth-connected metal sheath;
c) RC blankers (or equivalent) must be fitted in parallel to the load and must be of suitable
d) the electric panel that contains the instrument must have good earth connections;
e) the current output cable must be sheilded if it exceeds 20 m. in length.
START-UP
Upon starting up, the µP 97 checks the status of the data in memory and displays the relative error codes if for any
reason the data is not OK.
See the paragraph "ERRORS" for a description of the possible errors.
After this phase, the µP 97 goes into normal operation and displays the measurement, updating the current outputs
and the relays.
If, on turning on the instrument, the keys [ + ] and [ - ] are pressed at the same time, the µP 97 carries out a test
program: a flashing "0" appears; this can be either increased or decreased using the [ + ] and [ - ] keys. The
flashing value simulates the measurement and therefore the functions/programming of the current outputs and the
relays can be tested (N.B. the value proposed has no decimal point).
M003-23 - Rev. 03 - 05/2009
CAL
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Microprocessore µP97
K1
K2
L1
L2
µP97
size;
6
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