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Accura 2500M Main Module

Installed at the incoming line of the industrial control panel, Accura 2500M module performs the main function of the panel.
Voltage Measurement of the Incoming Line
Measures voltage by sensing the AC or DC voltage of the incoming line in the industrial control panel
Measurement Parameters
AC Voltage	Line-to-neutral voltage, Line-to-line voltage, and Frequency
	Fundamental voltage, vector diagram (phasor)
	Harmonics¹, THD
	Symmetrical components (positive-, negative-, zero-sequence components)
	Unbalance according to symmetrical components/the NEMA standard
	Residual voltage²
DC Voltage	DC voltage, RMS voltage
Power Quality
Dip/Swell¹	RMS voltage refreshed each cycle
PQ Curve¹	RMS voltage refreshed each cycle/SEMI F47-0706, IEC 61000-4-11/34 Class 3, and ITIC
Harmonics¹	Harmonics up to the 50th order, THD
Unbalance	Line-to-neutral/Line-to-line voltage unbalance, unbalance based on symmetrical components
Events
Power quality events	Dip/Swell events, PQ Curve events, Transient Voltage events
	Up to 100 power quality events can be saved.
Measurement events	Voltage connection events³	Phase open	Events on failures in voltage connection
		Fuse fail	Events on fuse failures on the line where voltage is measured
	Current events	Events on current values measured by Accura 2550 modules Events for each module can be configured on Accura 2500D’s screen.
	Leakage current events⁴	Events on leakage current values measured by Accura 2550CMZ/ CMS/ZM modules Events for each module can be configured on Accura 2500D’s screen.
	Voltage events	Events on voltage values measured by Accura 2550DCM module Events for each module can be configured on Accura 2500D’s screen.
	User-defined events	Events for which users set event input data and event operation modes Users can set up to 40 events via communication.
	Up to 100 measurement events can be saved.
Internal Communication with Accura 2500D Module
Dedicated communication	Sends/receives data to/from Accura 2500D with the manufacturer's dedicated protocol
Internal Communication with Accura 2550 Power Measuring Modules
Dedicated communication	Sends the AC or DC voltage data of the incoming line to multiple Accura 2550 modules
	Collects measurement and operational status data from multiple Accura 2550 modules
	Dedicated protocol of the manufacturer
	Number of connectable modules ⁵	In a single group	Up to 30 modules
		In two groups	Up to 40 modules
	Supports communication redundancy via device connections in a ring topology with 2 ports in the group 1 & 2
External Communication with the Host System
Ethernet communication	Communicates with the host system with Modbus TCP protocol at 100 Mbps
	Sends measurement data collected from multiple Accura 2550 modules to the host system
	Supports communication redundancy through ring topology using 2 Ethernet switch ports
	Wiring methods: Star, Daisy-chain, Ring topology (supports RSTP⁶ )
RS-485 communication	Communicates with the host system with Modbus RTU protocol at 1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200⁷ bps
	Sends measurement data collected from multiple Accura 2550 modules to the host system

1. Line-to-line voltage harmonics and line-to-neutral voltage harmonics are measured in 3P3W and 3P4W modes, respectively.
2. It is calculated by summing up three-phase line-to-neutral voltages
3. These events are not available when there is any phase connected to earth in 3P3W mode.
4. Leakage current is measured only by power/ leakage current measuring modules with the built-in ZCT.
5. Using the Accura 2500/2550 power/communication cable simulator, check module connections in advance. If the power
supply of the Accura 2500M is insufficient, an additional Accura 2550PS module should be connected. For details on
module connections, refer to ⌜Appendix B Module Connections⌝ in the User Guide.
6. RSTP(Rapid Spanning Tree Protocol), IEEE 802.1D-2004.
7. At 115,200 bps, a master can communicate with up to 16 slave devices, within a maximum distance of 600 m.

Accura 2500D HMI Module

Accura 2550IO Module

Accura 2550PS module

Accura 2500M Main Module

Power Supply: Accura 2500M-AC220V/DC110V
Port name	L+, N-, G(Ground)
Connector type	Terminal block ¹(M3.5 / bolt head Ø6)
Wire specs	0.34 - 4.0 mm² (22 - 12 AWG), copper
Power Supply(Us)²	AC 100 — 240 V 50/60 Hz, DC 100 — 300 V, CAT Ⅱ
Operating voltage range	0.9 x Us - 1.1 x Us
Power consumption³	Maximum 20W
Inrush current⁴	Peak 31 A, duration: no more than 1 msec(AC 220 V)
	Peak 11 A, duration: no more than 0.2 msec (DC 110 V)
Power Supply: Accura 2500M-DC24V
Port name	L+, N-, G(Ground)
Connector type	Terminal block ¹⁶(M4.0 / bolt head Ø7)
Wire specs	0.75 - 6.0 mm² (18 - 10 AWG), copper
Power Supply(Us)	DC 24 V, CAT Ⅱ
Operating voltage range	DC 20 — 30 V
Power consumption³	Maximum 20W
Inrush current⁴	Peak 6 A, duration: no more than 1 msec (DC 24 V)
Voltage Input
Module	Accura 2500M		Accura 2500M-VD^14,15
Port name	V₁, V₂, V₃, V_N		+Vdc, COM, -Vdc
Connector type	Terminal block ¹⁷(M4.0 / bolt head Ø7)
Wire specs	0.75 - 6.0 mm² (18 - 10 AWG), copper
Measurement category	Category III
Operating voltage range	DC, 42 — 65 Hz
Impedance	10 MΩ		20 MΩ
Burden	0.01 VA/phase @AC 220 V		0.05 W @DC 1,000 V
	0.001 W @DC 100 V
AC Voltage Measurement
Wiring method	3P4W, 3P3W, 1P3W, 1P2W
Sampling	512 samples/cycle
Measurement cycle(gapless)	Basic measurement	Frame: 0.2sec (12 cycles @60 Hz, 10cycles RMS @50 Hz)
	Dip/Swell measurement	1 cycle
Voltage	Measuring range (accuracy ensured)	AC 35 – 347 V L-N
		AC 60 – 600 V L-L(for unearthed Delta & Y systems)
	Accuracy	IEC 61557-12 Class 0.5	±0.5 % Reading
	Minimum measured value	AC 5 V L-N
	Measurement data	Line-to-neutral voltage, Line-to-line voltage
		Fundamental, harmonics (up to the 50th order)⁶
		Vector diagram(phasor), THD, waveforms
		Symmetrical components(positive, negative, zero-sequence)
		Unbalance according to symmetrical components/the NEMA standard
Residual voltage	Measuring method	Calculation of the sum of 3-phase voltage
	Measurement data	RMS, fundamental
	Accuracy/operating range	±0.5 % Un⁵ /Up to 347 V L-N
Frequency	Measuring range	42 — 65 Hz
AC Power Quality
Dip/Swell⁶	Measured value/Threshold	RMS voltage refreshed every cycle	Threshold set by users
PQ Curve⁶	Measured value/Threshold	RMS voltage refreshed every cycle	Dip/Swell: 90 % / 110 % of Vref
	Curve type	SEMI F47-0706, IEC 61000-4-11/34 Class 3, ITIC
Voltage harmonics⁶,THD	Harmonic order	Up to the 50th order
	Measurement data	Magnitude of each harmonic, THD
Voltage Unbalance	Measurement data	Line-to-neutral voltage / Line-to-line voltage unbalance according to NEMA standards
		Zero-sequence unbalance and negative-sequence unbalance
DC Voltage Measurement
Module	Accura 2500M		Accura 2500M-VD
Wiring method	DC2W, 2DC3W, 3DC4W, Bipolar(3W)		1DC2W, Bipolar(3W), Unipolar(2W)
Sampling frequency	25.60 kHz(sampling cycle 39us) @50 Hz mode
	30.72 kHz(sampling cycle 33us) @60 Hz mode
Measurement cycle(gapless)	Basic measurement: Frame 0.2 sec
	Dip/Swell measurement: 1 subframe(20 ms @50 Hz mode, 16.7 ms @60 Hz mode)
Measuring range(accuracy ensured)	Up to 300 Vdc		1DC2W, Bipolar(3W): Up to 1,000 Vdc Unipolar(2W): Up to 2,000 Vdc
Max.measuring rang	Up to 550 Vdc		1DC2W, Bipolar(3W): Up to 1,200 Vdc Unipolar(2W): Up to 2,400 Vdc
Measurement accuracy	±0.5 % Reading ± 0.05 % Un¹³		±0.5 % Reading ± 0.05 % Un¹³
Min. measured value	5 Vdc		10 Vdc
Measurement data	DC voltage, RMS voltage, waveforms		DC voltage, RMS voltage, waveforms
DC Power Quality
Dip/swell	Measured value/Threshold	DC voltage refreshed every subframe	Threshold set by users
Internal Communication
Type	Communication with Accura 2500D		Communication with Accura 2550
Port	1 port (DISPLAY)		2 ports for each group, 4 ports for 2 groups(The ports have the same functions)
Comm cable	Internal communication cable for the display module(Cat.5e 24 AWG FTP)⁷		Internal communication cable ⁸
Cable length	Up to 3 m		The total cable length in a group: up to 50 m (each cable: up to 10 m)
External Communication
Type	Ethernet communication		RS-485 communication
Protocol	Modbus TCP Protocol		Modbus RTU Protocol
Port	2 ports (ETHERNET1, ETHERNET2)⁹		1 port / Ta(TRX+), Tb(TRX-)
Connector type	RJ45 connector		Terminal block
			M3.5 / bolt head Ø6¹	AC220V/DC110V
			M4.0 / bolt head Ø7¹⁶	DC24V
Comm cable	Ethernet cable Cat 5e FTP, STP, SFTP¹⁰		UL 2919 RS-485 1P/2P 24AWG
Comm speed	100 Base-TX(100 Mbps/Full Duplex)		1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 bps¹¹
Wiring method	Star, Daisy-chain, Ring topology(RSTP¹² )		Multidrop wiring
Cable length	Maximum 100 m		Maximum 1,219 m(4,000 ft)

1. The maximum screw tightening torque of the barrier-type terminal block is 1.4 Nm(14 kgf-cm, 12 lbf-in).
2. The device conforms to UL standards for the tested AC power supply voltage.
3. It refers to the maximum power consumption when Accura 2500D and Accura 2550 are connected.
4. When installing a fuse at the voltage line, it is recommended to use a fuse above Class RK5 2A/500V due to inrush current.
5. Un indicates the basic voltage, 277 V.
6. Line-to-line voltage and line-to-neutral voltage are measured in 3P3W and 3P4W modes,respectively.
7. It is provided with the product.
8. It is provided with the product. Additional communication cables needed for ring topology are sold separately.
The conducting wire of the communication cable should be at least 0.205 mm² (24 AWG)
It is recommended to keep a distance of over 5 mm from power lines generating high levels of noise.
9. The built-in Ethernet switch allows for daisy-chain connections between Accura 2500M modules without the need for separate external switches.
10. FTP(Foiled Shielded Twisted Pairs), STP(Braided Shielded Twisted Pairs), SFTP(Braided Foiled Shielded Twisted Pairs)
11. At 115,200 bps, a master can communicate with up to 16 slave devices, within a maximum distance of 600 m.
12. RSTP(Rapid Spanning Tree Protocol), IEEE 802.1D-2004.
13. Un indicates the basic voltage, 277 Vdc. However, for Accura 2500M-VD module, its basic voltage is 560 Vdc.
14. Accura 2500M-VD module equipped with a voltage divider should be used for high voltage measurement.
15. The product number (P/N) of the connected VD module must match that of the Accura 2500M product to ensure precision measurement.
16. The maximum screw tightening torque of the barrier-type terminal block is 1.2 Nm(12 kgf-cm, 10.6 lbf-in).
17. The maximum screw tightening torque of the barrier-type terminal block is 1.8 Nm(18.4 kgf-cm, 16 lbf-in).

Accura 2500D HMI Module

Accura 2550IO Module

Common Features
Power supply	Communication cable (RJ45A, RJ45B)	Receives power from Accura 2500M via the internal communication cable
	2 pin connector (+5V-)	Auxiliary input terminal: used to supply additional power from an external power source when the power supplied by Accura 2500M is insufficient^1,2
Communication port	Port name	RJ45A, RJ45B(ring and daisy-chain topology)
	Connector type	RJ45 connector
	Protocol	Dedicated protocol of the manufacturer
	Communication cable	Ethernet cable 24 AWG solid copper Cat 5e FTP, STP, SFTP³
Rotary switch²	Communication ID	1 — 9 (The letters from A to F on the rotary switch indicate standby IDs.)
	Standby ID	0 (Factory default ID, communication unavailable)
Digital Input	Connector type	Pluggable connector / Push-in spring connection
	Wire specification	0.25 ― 2.5 mm² (24 ― 14 AWG)
	Insulation voltage	Max AC 2,000 V for 1 min
	Input type	Internal DC 24 V power supply (self-excitation)
Digital Output	Connector type	Pluggable connector / Push-in spring connection
	Wire specification	0.25 ― 2.5 mm² (24 ― 14 AWG)
	Output type	Dry contact (external excitation), Form-A contact
	Insulation voltage	Max. AC 2,000 V for 1 min
	Output rating	AC-15: 5 A / 250 V, DC-13: 5 A / 30 V
	Max. allowable voltage (Open contact)	1,000 V
	Output signal type	Latch, Pulse (configurable)
Accura 2550IO-DI1/DI2
Digital Input	Number of channels	11	Accura 2550IO-DI1
		22	Accura 2550IO-DI2
Accura 2550IO-DO1/DO2
Digital Output	Number of channels	6	Accura 2550IO-DO1
		12	Accura 2550IO-DO2
Accura 2550IO-AI1/AI2
Analog Input (DC current)	Number of channels	6	Accura 2550IO-AI1
		12	Accura 2550IO-AI2
	Input type	DC 4 — 20 mA / 0 — 20 mA current
	Input signal type	Isolated single-ended input (common gound between channels)
	Internal input resistance	130Ω
	Accuracy	±0.5 % Full Scale (Full scale: 20 mA)
Accura 2550IO-RTD1/RTD2
Analog Input (RTD sensor)	Number of channels	4	Accura 2550IO-RTD1
		8	Accura 2550IO-RTD2
	RTD sensor type	PT 100 / PT 1000
	Sensor wiring method	2-Wire / 3-Wire
	Temp. measuring range	–100 — 200°C
	Accuracy	±0.5 % Full Scale (Full scale: 200°C)

1. When the power supply capability of Accura 2500M is insufficient, additional power can be supplied by either connecting
Accura 2550PS module to Accura 2550IO module via a communication cable or by connecting an external power source to
the auxiliary input terminal of Accura 2550IO module.
2. The auxiliary input terminal is only available on the Accura 2550IO-DI2/DO2/AI2/RTD2 module.
3. FTP(Foiled Shielded Twisted Pairs), STP(Braided Shielded Twisted Pairs), SFTP(Braided Foiled Shielded Twisted Pairs)
4. The communication ID of the module with a rotary switch is obtained by adding an offset to the rotary switch ID.
The default offset value is 30 but can be changed.

Accura 2550PS Module

General Specifications

Environmental Conditions
Operating temperature	–20 — 70℃(–4 — 158℉)
Safe operating temperature¹	–20 — 60℃(–4 — 140℉)
Storage temperature	–40 — 85℃(–40 — 185℉)
Operating humidity	5 – 95%(non-condensing)
Operating altitude	Up to 2,000 m
Ingress Protection against Dust and Water			IEC 60529
Accura 2550IO-DI1	IP20
Accura 2550IO-DI2
Accura 2550IO-DO1
Accura 2550IO-DO2
Accura 2550IO-AI1
Accura 2550IO-AI2
Accura 2550IO-RTD1
Accura 2550IO-RTD2
Accura 2550PS
Warranty Period
2 years
Shock			IEC 60068-2-27
All modules	15 g / 11 ms
EMC Immunity
Electrostatic discharge immunity	8 kV / air	±6 kV / contact	IEC 61000-4-2
Radiated radio-frequency electromagnetic field immunity	10 V/m		IEC 61000-4-3
Electrical fast transient/Burst immunity	±2 kV / 5 kHz (power)	±1 kV / 5 kHz (signal)	IEC 61000-4-4
Surge immunity	±1 kV (line-earth)	±0.5 kV (line-line)	IEC 61000-4-5
Immunity to conducted disturbances Induced by radio-frequency field	3 V		IEC 61000-4-6
Power Frequency Magnetic Field	30 A/m		IEC 61000-4-8
Voltage dips, short interruption and voltage variations immunity	0 %, 0.5 cycles	40 %, 10/12 cycles	IEC 61000-4-11
	70 %, 25/30 cycles	80 %, 250/300 cycles
Voltage Interruption (Class C)	0 %, 250/300 cycles		IEC 61000-4-11
EMC Emission
Conducted emission and radiated emission	CISPR 11 Group1 Class A		CISPR 11
	IACS UR E 10 Rev. 7 2018

1. Compliant with UL 61010-1 3rd edition

Accura 2500D is installed at the front of the industrial control panel. The 5" TFT Color LCD screen on the front of the device provides users with data on Accura 2500M device, as well as measurement and operational status data on multiple Accura 2550 modules via communication. In addition, users can configure all functions of Accura 2500M and Accura 2550 modules through the touch-enabled TFT Color LCD screen of Accura 2500D module.
Connection with Accura 2500M
Direct connection	Accura 2500D can be attached/detached to/from Accura 2500M using its built-in connector at the back.
Connection with a cable	Accura 2500D can be connected to Accura 2500M using an RJ45 communication cable.
Internal Communication with Accura 2500M
Dedicated communication	Sends/ receives data to/ from Accura 2500M via the manufacturer's dedicated protocol
	Displays data on Accura 2500M as well as measurement and operational status data on multiple Accura 2550 modules
	Functions of Accura 2500M and Accura 2550 modules can be configured through Accura 2500D module.

Module type	Module Name	Channel		Specifications	Power consumption
DI1 module	Accura 2550IO-DI1	Digital input	11 channels	Internal DC 24 V power supply (self-excitation)	0.52 W
DI2 module	Accura 2550IO-DI2	Digital input	22 channels	Internal DC 24 V power supply (self-excitation)	0.59 W
DO1 module	Accura 2550IO-DO1	Digital output	6 channels	Dry contact (external excitation)	1.07 W
DO2 module	Accura 2550IO-DO2	Digital output	12 channels	Dry contact (external excitation)	2.02 W
AI1 module	Accura 2550IO-AI1	Analog input	6 channels	DC 0 ― 20 mA	0.52 W
AI2 module	Accura 2550IO-AI2	Analog input	12 channels	DC 0 ― 20 mA	0.54 W
RTD1 module	Accura 2550IO-RTD1	RTD input	4 channels	RTD(PT100/PT1000) sensor, 2-wire and 3-wire connections	0.52 W
RTD2 module	Accura 2550IO-RTD2	RTD input	8 channels	RTD(PT100/PT1000) sensor, 2-wire and 3-wire connections	0.58 W

Module Type	Module Name	Item	Description	Power
Auxiliary power supply module	Accura 2550PS¹	Input power supply	AC 100 — 240 V 50/60 Hz, DC 100 — 300 V	20 W
		Output power supply	DC 5.0 — 5.4 V	15 W
		Function	If the number of connected modules exceeds the power supply capacity of Accura 2500M, additional power must be supplied.

LCD Display
LCD features	5"(108.0 x 64.8 mm) Color TFT LCD 800 x 480 pixel LED backlight and touch panel
Internal Communication with Accura 2500M
Connector type	RJ45 connector (for connection with a communication cable)
Comm cable	Internal communication cable for the display module(Cat.5e 24 AWG FTP)¹
Cable length	Up to 3 m

Power supply ¹
Input power supply	Port name	L+, N-, G (Ground)
	Connector type	Screw-type terminal(pluggable)
	Wire specifications	2.1 — 3.5 mm² (14 — 12 AWG), copper
	Wire temperature rating	Above 70°C
	Power supply voltage(Us)	AC 100 — 240 V 50/60Hz, DC 100 — 300 V, CATⅡ
	Operating voltage range	0.9 x Us — 1.1 x Us
	Power consumption	Maximum 20 W (based on the input power)
	Inrush current	Peak 31 A, duration: no more than 1 msec (AC 220 V)
		Peak 11 A, duration: no more than 0.2 msec (DC 110 V)
	External input fuse capacity²	2 A, 500 V
Output power supply	Port name	RJ45A, RJ45B (used for power supply to Accura 2550IO module)
		+5V- (screw-type, auxiliary output terminals)
	Output voltage	DC 5.0 — 5.4 V
	Supplied power	Maximum 15 W (based on the output power)
Load Status LED Indicator
Load	LED Indicator Color
Less than 50 %	Blue
Between 50 and 80 %	Blue, Yellow
From 80 and 100 %	Blue, Yellow, Red