HT Italia GSC53N, Instruction Manual

Page: 101 / 152

GSC53N - GSC57 - ZG47
EN - 99
8.8.2. Using the Instrument in a Three Phase 4 Wire System
WARNING
The maximum voltage between B1, B2, B3, B4 inputs is 600 V~ (CATII) /
350V~ phase – earth or 600V~ (CATIII) / 300 V~ phase to earth.
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.
R
S
T
N
B1 B2 B3 B4
I3
I2
I1
I1
I2
I3
Instrument connection in a three-phase 4 wire system
WARNING
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 8.1
and 8.2). Particularly, the 3PH4W mode must be set.
2. Select the working mode corresponding to the type of analysis desired. In case of
doubts select the POWER working mode (see paragraph 8.6).
3. Connect the phase and neutral voltage wires respecting the connections shown in the
picture.
4. If you want to measure current and power, connect the clamp meter to the phase
conductor respecting the specifications shown on the clamp and the connections
shown in the picture. In case of doubts select the
POWER working mode and,
connecting one clamp at a time, check if:
a) the phase sequence is correct (see paragraph 8.4.2).
b) the active power P of each phase is positive. If it’s negative, remove current
transducer from the wire and reconnect it so the transducer label faces the opposite
direction.
c) the value of the Pf of each phase is not excessively low (typically it’s not lower than
0.4). In case the Pf is lower than 0.4, check if the phase voltage is associated to the
right clamp meter (for example the voltage of phase 1 must be associated to the
clamp meter no. 1).
5. Apply voltage to the electrical equipment under test (if previously shut off for the
instrument connection).