Interface Description

The CPKM3000 meter features a range of physical and electrical interfaces that support integration with EVSE Electric Vehicle Supply Equipment (Electric Vehicle Supply Equipment). These include power supply inputs, voltage measurement points, LED indicators, a display interface, and a CAN bus for communication.

Power Input and CAN Bus

The meter includes:

AC power input
Voltage measurement circuit
LED indicators
LCD display
CAN bus interface

Integrated Meter Wiring Diagram – Voltage and current circuit

Note: 3-phase meter can also be used as 1-phase meter. For 1-phase meter, only L1 and N are necessary.

Main Connectors

The CPKM3000 meter includes a 40-pin main connector used for interfacing with power lines, neutral lines, CAN communication, and control signals. Each pin is designated for a specific signal or voltage rail, supporting the operation and monitoring functions of the meter.

Main Connectors

Connector Pinout Table

The following table lists the connector pin assignments for the CPKM3000 meter, including the pin ranges, signal names, and their corresponding electrical or communication functions.

Pin out Ranges
Pin Range	Signal Name	Description
1–2	AC_L1_IN_hv	L1 power supply of meter
3–4	blank	—
5–6	blank	—
7–8	AC_L2_IN_hv	L2 power supply of meter
9–10	blank	—
11–12	blank	—
13–14	AC_L3_IN_hv	L3 power supply of meter
15–16	blank	—
17–18	blank	—
19–20	AC_SYS_N_RTN	Neutral for the system
21–22	blank	—
23–24	N	N power supply of meter
25–26	blank	—
26–27	blank	—
28–29	blank	—
30	blank	—
31–32	V3P3_A0P25_FI_lv	Filtered 3.3V supply from the EVSE Electric Vehicle Supply Equipment AC Board powering the SELV side of the meter data interface
33	CAN_TX_lv	Transmit data line from meter to CAN bus (SELV side)
34	DBG_Rx_FLT_lv	FAULT indicator line from EVSE Electric Vehicle Supply Equipment AC Board to meter; also used for UART debug Rx (SELV side)
35	CAN_RX_lv	Receive data line from CAN bus to meter (SELV side)
36–38	0V_J1_lv	0V (ground) supply on SELV side of the meter
37	ACS_DATA_Tx_lv	UART transmit line for data sent to ACB controller (e.g., zero crossing and voltage samples)
39	ADC Analog-Digital Converter_SYNC_lv	Synchronization pulse to align external meter readings to voltage samples (SELV side)
40	V_TX_UART_lv	UART data transmit line to external devices for metrology data (SELV side)

Pin P1R (Right)

Pin Range	Signal Name	Description
1–2	AC_L1_IN_hv	L1 power supply
7–8	AC_L2_IN_hv	L2 power supply
13–14	AC_L3_IN_hv	L3 power supply
19–20	AC_SYS_N_RTN	Neutral return
23–24	N	Neutral power supply
31–32	V3P3_A0P25_FI_lv	3.3V supply for SELV side
33	CAN_TX_lv	CAN bus transmit
34	DBG_Rx_FLT_lv	Fault indicator/debug
35	CAN_RX_lv	CAN bus receive
36–38	0V_J1_lv	Ground (SELV side)
37	ACS_DATA_Tx_lv	UART Tx to ACB controller
39	ADC Analog-Digital Converter_SYNC_lv	Sync pulse for external meters
40	V_TX_UART_lv	UART Tx for metrology data

Display Information

The display of the CPKM3000 meter provides real-time visual feedback of energy usage and software status. When powered by any phase (L1, L2, or L3 to N), the display automatically cycles through the following values every 3 to 6 seconds:

Display Values

State	Description	Caption Preview
POS	Positive (grid to EV Electric Vehicle) energy register	POS display
XXXXX.XX kWh	Accumulated positive energy	kWh display
NEG	Negative (EV Electric Vehicle to grid) energy register	NEG display
XXXXX.XX kWh	Accumulated negative energy	kWh display
Lrs	Legally relevant software	Lrs code
YYYYYY SW	Software version	SW display

POS – Grid to EV Electric Vehicle energy

kWh – Accumulated positive energy in kWh

NEG – EV Electric Vehicle to grid energy

kWh – Accumulated negative energy in kWh

Lrs – Legally relevant software

SW – Software version

LED Indicators

The CPKM3000 meter includes two LEDs integrated into the display panel:

Impulse LED (red):
- Pulses at a rate of 20000 impulses per kWh.
- Used to calculate metered energy with high resolution.