PM-3112-160-MTCP 2 Loops single-phase Smart Power Meter- QuickStart (Feb/2019)
ICP DAS USA, Inc.
| 1-310-517-9888 | 24309 Narbonne Ave. Suite 200. Lomita, CA 90717
3
3.2. Voltage Input
1.
PM-311x series: Input Voltage up to 300V. For any higher Input Voltage large than 300V, please
add the PT (power transformer), and Change PT RATIO setup.
Notice: Please check the L‐N connection of PM‐311x‐xxxC series or it will cause the damage. Please refer
the following diagram.
3.3. Current Input
1. The external CT’s are fragile, please handle with care.
2. The current input of PM-311x series is in mA range. Only the ex-factory attached CT’s can be used.
The other CT’s, for example, from panel will damage the instrument due to its large current (around
5A)
3. When more than one smart meters (PM-311x series) are installed, please do not disconnect the CT
with its original meter and mix us e with each other. Since each set of smart meter (PM- 311x series)
and its attached split type clip -on CT are calibrated set by set. The mix use may cause wrong
measurements.
4. To install CT’s correctly, please ensure the CT lines sequences is right before clip the CT’s onto the
power cable of the monitoring equipment. (De tail will be found in next section)
5. When measuring the current, the secondary circuit of a CT should never be opened when a load is
passing through its primary. Make sure you always open the CT clip to detach the CT before removing
the terminal lines. Otherwise, it will cause severe injury.
6. Plea se handle with extra care, especially when the operation space of CT’s is limited.
7. The current direction must follow K-L marked on CT’s.
8. Please select the right size CT’s for different size of monitoring equipment cables:
Power cable diameter
＜Φ
10 use 60 A CT
，Φ
10
～Φ
16 use 100A CT
，Φ
16
～Φ
24 use 200A CT
9. The maximum current value cannot exceed the CT rating.
