Amprobe DM-111S Current-Data-Logger - Manual (Page 46)

DMIIIS
EN - 44
11.4. USING THE INSTRUMENT IN A THREE PHASE 3 WIRE SYSTEM
CAUTION
The maximum voltage between L1, L2, L3 and COM (L2) inputs is CATIII
635V~ phase-phase. Do not measure voltages exceeding the limits
prescribed by this manual. Should you exceed the voltage limits you could
damage the instrument and/or its components or endanger your safety.
L 1
B L U E
L 2
L 3
R E D
B L A C K
Y E L L O W
Fig. 3: Instrument connection in a 3 wire / three-phase system
CAUTION

Please note that in this case the yellow cable (neutral) is connected with
the red cable on phase 2.

If possible, before connecting the instrument to the electrical equipment
to be tested take the power supply off the electrical equipment.
1. Check, and if needed modify, the basic settings of the instrument (see paragraphs 5.2
and 5.3). Particularly, the 3-wire mode must be set.
2. Rotate the switch to the position corresponding to the type of analysis desired. In case
of doubts, select the position POWER (see paragraph 6.3).
3. Connect the phase and neutral voltage wires following the connections shown in Fig. .
4. To measure current and power, connect the clamp to the phase conductor following the
specifications shown on the clamp and the connections shown in Fig. . In case of
doubts set temporarily the 3PH3W mode, select the POWER position, connect the
yellow wire of the instrument to earth and, connecting one clamp a time, check if:
a) The phase sequence is correct (see paragraph 6.1.2).
b) The active power P of each phase is positive. If negative, turn the clamp of the
phase in question.
c) The value of the Pf of each phase is excessively low (typically it is not lower than
0.4). If the Pf is lower than 0.4, check if the phase voltage is associated with the
right clamp meter, (ex. the voltage of phase 1 must be associated to the clamp n.
1).
d) After checking, and if needed modifying, the connection of the instrument to the
equipment re-set the 3-wire mode and the connections shown in Fig. (yellow and
red wires together).
5. Energize the electrical equipment under test.
6. The values of the available electrical parameters will be displayed of the instrument.
For further details see the paragraph relevant to the position of the switch.
7. You can press HOLD to interrupt the updating in real time of the displayed values.
8. If you want to record:
a) Check and modify the values of the basic parameters (see paragraphs 5.2 and 5.3).
b) Check and eventually modify the recording parameters by pressing MENU (see the
paragraph corresponding to the position of the rotary switch selected).