LEM EM4TII+ - Page 10

05November2020/V1.0 Page 10/33
Version
Channel 1
Channel 2
Channel 3
Channel 4
AC
AC-voltage
AC-current
ACDC
AC-voltage
AC-current
DC-voltage
DC-current
DC
DC-voltage
DC-current
DCDC
DC-voltage
DC-current
DC-current
DCDCDC
DC-voltage
DC-current
DC-current
DC-current
DC-voltage is always measured via a voltage/current transducer.
The connection wires to be used:
Screw terminals:
• Interfaces: 0.14 mm² to 1.5 mm² (use wire end ferrule)
• Measuring and supply terminals: 0.2 mm² to 4 mm² (use wire end ferrules)
Parallel to the screw terminal for the RS interface there is a plug connector (grid dimension 2.54 mm)
to which a computer/laptop can be connected locally. The plug connector and the screw terminals are
connected to each other electrically. Thus, both interfaces are of the same RS type. When reading out
locally you must make sure that there is currently no communication in process via the RS screw
terminals. An active communication process is indicated in the display by an arrow over "RS". If an
attempt to communicate is made whilst another communication process is in process, the current
communication process breaks down.
Cable glands (properties):
• Measuring signal 3 x M16 x 1.5 (Ø 6.5 – 9.5 mm)
1 x M20 x 1.5 (Ø 9.5 – 13.5 mm)
• Supply and communication 4 x M16 x 1.5 (Ø 4.0 – 6.5 mm)
13 – GPS (in) - RS232-TxD
16 – RS232-n.c. RS485-n.c. RS422-A
14 – GPS (in) - RS232-RxD
17 – RS232-n.c. RS485-n.c. RS422-B
15 – GPS (in) - RS232-GND
18 – RS232-TxD RS485-B + RS422-B’
19 – RS232-RxD RS485-A - RS422-A’
20 – RS232-GND RS485-GND RS422-GND
1 – U_Modem + (out)
5 – CH1 high 9 – CH3 high
2 – U_Modem - (out)
6 – CH1 low 10 – CH3 low
3 – U_Batt + (in)
7 – CH2 high 11 – CH4 high
4 – U_Batt - (in)
8 – CH2 low 12 – CH4 low
Since the nomenclature of the terminals of the RS422 interface for the LEM Products EM4T and
EM4TII+ are different, please use in case of replacement of the EM4T with EM4TII+ in an installation
the table below to connect the RS422 interface.
Marking of the
connector
Data flow direction
(relative to EM4T/EM4TII+)
EM4T
EM4TII+
Tx+
A
Send
Rx+
A‘
Receive
Tx-
B
Send
Rx-
B‘
Receive
Figure 3.3: Connection assignment (n.c: not connected)
Table 3.1: EM4TII+ inputs configurations