Power Meter

Target Asset and features

• Enhance the monitoring capabilities of any Edge IoT Kit by incorporating the Power Analyzer IoT Kit, enabling the acquisition of advanced electric parameters such as power factor (cosphy) and active/passive power analysis.

The Kit Include:

• 1 x EXP SER
• 1 x Schneider PM3250 Power Analyzer
• 3 x 500 AMP PM3250 dedicated power clamps

General Hardware Characteristics

EXP-SER

The EXP-SER expansion board allows your application to communicate over RS485, RS232 and CAN interfaces.

• CAN: The board uses the MCP2518FD IC, It is an External CAN FD Controller. The board also uses NCV7357 as a CAN FD Transceiver. Connections between the controller and the transceiver are digitally isolated by the ISO7763 IC.
• RS232 interface: The board uses the MAX3232 IC, 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver. The output pins of the IC are directly connected to the header P1.
• RS485 interface: The board uses SN65HVD1786D RS485 Transceiver. The output pins of the IC are directly connected to the header P2.

IMPORTANT: RS232 and RS485 peripherals refer to the same hardware serial interface. RS232 and RS485 cannot be used together at the same time.

IMPORTANT: RS232 and RS485 use also the same signal for:

• RS232 → Ready-To-Send (RTS);
• RS485 → Receive/Transmit Enable signal.

PM3250

Overview

Name	Description
Type of measurement	Active and reactive power Apparent power Current Voltage Energy Power factor Frequency Total current harmonic distortion THD (I) Total voltage harmonic distortion THD (U)
Supply Voltage	100...277 V AC 45...65 Hz 173...480 V AC 45...65 Hz 100...300 V DC
Network Frequency	60 Hz 50 Hz
[In] rated current	5 A 1 A
Type of Network	1P + N 3P 3P + N
Measurement current	0.02…1.2 A 0.05…6 A
Analogue input type	Current 0...5 A Current 0...1 A
Measurement voltage	50…330 V AC 45...65 Hz direct 50…330 V AC 45...65 Hz phase to neutral 80…570 V AC 45...65 Hz direct 80…570 V AC 45...65 Hz phase to phase 570…999000 V AC 45...65 Hz with external VT
Frequency measurement range	45…65 Hz
Communication port protocol	Modbus at 9.6...38.4 kbauds
Communication port support	RS485

Component description

Symbol	Description	Present
A	2 x Digital Inputs	✖
B	2 x Digital Outputs	✖
C	RS485 Communications Port	✔
D	Communications LED	✔
E	Energy Pulse LED (5000 / kWh)	✔
F	Cancellation	✔
G	Confirmation	✔
H	Up	✔
I	Down	✔
J	Display	✔
K	Sealing Points	✔
L	Sealable Coverss	✔
M	V1 - V3, Vn, I1 - I3, L1, L2	✔

For the complete PM3250 documentations refer to the official docs

Screw Description

EXP-SER

P1 - Upper Screw Terminal

Screw Number	Symbol	Description
1	CTS	Clear to send signal for RS232
2	RTS	Request to send signal for RS232
3	GND	Isolated ground for the serial and CAN
4	TX	TX signal for RS232
5	RX	RX Signal for RS232

P2 - Upper Screw Terminal

Screw Number	Symbol	Description
6	CANL	CAN Low signal
7	CANH	CAN High signal
8	GND	Isolated ground for the serial and CAN
9	RS485A	RS485 Line A
10	RS485B	RS485 Line B

• Isolation: 125V(rms) / 1500V(peak)
• Overvoltage Cat.II / Pollution Deg.II

Switches

Rotary-switches

INT SW: Controls which hardware channel you want to link the interrupt. Present in EXP-SER as SW1.

Pin	Pin on zBUS	Pin ZM1-DB
0	INTR	D35
1	INTB	NC
2	INTE1	D46
3	INTE2	D47

Dip-switches

EXP-SER

S1 Switch

Pin	OFF	ON
1	Select SERIAL1 of ZBUS	Select SERIAL2 of ZBUS
2	-	Use CTS with CAN (MCP2518 Chip Select)
3	-	Use CTS with RS232

IMPORTANT: Never enable together S1.PIN2 and S1.PIN3

S2 Switch

Pin	OFF	ON
1	-	Enable RS485 termination (120Ω)
2	Disable RX channel RS485	Enable RX channel RS485
3	-	Enable CAN termination (120Ω)