HT instruments MPP300 - Manual (Page 19)

MPP300
EN - 17
9. Connect the output connector of the DC clamp to the IDC1 input of unit MPP300.
CAUTION
BEFORE CONNECTING THE DC CLAMPS TO THE CONDUCTORS
Switch on the clamp, check the LED indicating the status of the clamp’s
internal batteries (if present), select the correct range, press the ZERO key
on the DC clamp and check on the display of SOLAR300N the actual
zeroing of the corresponding Idc value (values up to 0.02A are acceptable).
10. Insert the DC current clamp onto the positive output conductor of the string, respecting
the direction of the arrow found on the clamp itself as indicated in Fig. 4 or Fig. 5.
Position the clamp toroid as far as possible from the inverter and from the negative
output conductor of the string itself.
11. Repeat the operations described in the two steps above for other possible DC power
trackers to be monitored by using the IDC2 and IDC3 inputs according to the number of
DC inputs set(see SOLAR300N user’s manual).
12. Connect the VAC1 and N inputs of unit MPP300 to the Phase and Neutral conductors
respectively, respecting the polarities and the colours indicated in in Fig. 4 or Fig. 5. In
case of three-phase systems in which no Neutral conductor is available, connect input
N to earth.
13. In case of inverter with three-phase output (see SOLAR300N user’s manual), repeat
the operation described in the step above for the remaining phases by using the VAC2
and VAC3 inputs of MPP300.
14. Connect the AC clamp to the Phase L1 conductor, respecting the direction of the arrow
found on the clamp itself as indicated in Fig. 4 or Fig. 5. Position the clamp toroid as far
as possible from the inverter and from the Neutral conductor. Connect the clamp output
to the IAC1 input of MPP300.
15. In case of inverter with three-phase output (see SOLAR300N user’s manual), repeat
the operation described in the step above for the remaining phases by using the IAC2
and IAC3 inputs of MPP300.
16. Restore the operation of the electrical system being measured.
17. The display of SOLAR300N will show the values
of the general electrical parameters of the system
being measured.
In particular, in this screen:
Pdc = General dc power (sum of the string powers)
Pac = ac power (if single-phase) or sum of the ac
powers (if three-phase)
We recommend checking that the values of the
electrical parameters (Pnom, Pdc, Pac) and of the ac
performance (
ac) are consistent with the system
being measured (e.g.:
ac > 1 is not physically
acceptable).