Installation manual

UNIPOWER
Installation manual PQ Secure
19
4.4 Connection alternatives
The UP-2210 recorders support all standard 1-phase and 3-phase connections. The unit is configured
using PQ Online, where you can easily select the connections described below. The software also
allows you to define the constants for the potential and current transformers used (PT, CT).
4.4.1 1-phase measurement with direct voltage and one CT (Line-to-neutral voltage)
Figure 9
The above wiring diagram is used for one-phase measurement in low voltage networks. The voltage
channels of the unit are connected directly to the electricity network for measuring line-to-neutral
(230 V) and therefore do not require an instrument transformer (PT). However, the current channels
are connected to existing instrument transformers, allowing the measurement of high currents, e.g.
directly from the secondary side of a power transformer. Always protect the voltage inputs with a 1A
fuse in each conductor (red conductor). The connection for this type of measurement is as follows:
Channel: Measured object: Channel: Measured object:
U1+ = L1 I1+ = CT+
U1- = (Neutral) I1- = CT- (Grounded)
1A