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Digital Power Quality Meter

Display
Shows real–time measurement data on the LCD screen
Voltage
L-N voltage, L-L voltage, Fundamental frequency, Harmonics, Phasor diagram, THD¹, Symmetrical components(positive–, negative–, zero–sequence),Voltage unbalance(symmetrical components and the NEMA standard),Residual voltage
Current
Phase current, Fundamental frequency, Harmonics, Phasor diagram, THD¹, TDD², Symmetrical components(positive–, negative–, zero–sequence), Current unbalance(symmetrical components and the NEMA standard),Residual current
Power
Active, Reactive, Apparent power
Power Quality
Voltage / Current harmonics	Magnitude of each harmonic up to the 50th order, THD, Current TDD, Crest factor, K–factor
Dip/Swell	RMS voltage refreshed every cycle
PQ Curve	RMS voltage refreshed every cycle
Unbalance (voltage, current)	Unbalance according to the NEMA standard, Negative–/zero–sequence unbalance based on symmetrical components
Phasor diagram	Voltage and current phasor
Waveform	Voltage and current waveforms
	Data available via communication: 12 cycles of waveforms (128 samples/cycle), Data available via the device’s LCD screen: 2 cycles of waveforms (128 samples/cycle)
Events
Power quality events³	Dip/Swell events
	PQ Curve events
	Up to 500 power quality events can be saved.
Measurement events	Voltage connection events³	Monitors the voltage/current data measured for 0.2 seconds (definite time: 1 second)
		Phase open event
		Fuse fail event
		Blackout event
	Custom events³	Users can set up event input data, thresholds, and event detection methods. Event setup can be performed only via communication.
		Up to 80 events can be set up.
		Event input data	Data measured at 0.2-sec intervals
			Selectable among Voltage/Current/Power/ Etc.
		Threshold	Set by users
		Detection method	“Over” or “Under” condition set by users
	Module events	Determined with the data measured with a resolution of 0.01 seconds
		Digital input events	Rising or Falling edge detection events
		Analog input events	“Over” or “Under” events
			Thresholds set by users
	Up to 500 measurement events can be saved.
System events	Events on module control, communication status, setup, etc
	Up to 1,000 system events can be saved.
Aggregation of Measurement Data
Aggregation intervals	Fixed intervals	6 intervals(1 and 5 seconds, 1 and 5 minutes, 1 and 6 hours)
	Custom aggregation intervals	Supports 5 custom aggregation intervals
Aggregated measurement data	Average value	Average value of the values measured for 0.2 seconds
	Max/Min value	Max/Min value of the values measured for 0.2 seconds
Aggregation for the latched value⁴	Last latched value	Provides the last measured data by latching the value
Data displayed on the LCD screen	Average value	Average values of the values measured for 0.2 seconds (1-second aggregation interval)
	Max/Min value	Max/Min value of the average values for the 1-second aggregation interval after resetting the values
Connections of IO Modules
Users can check the measurement data and connection status of the connected IO modules with the function to automatically detect module connection status and set up module IDs.
Max number of IO modules connectable to the back of the meter	4 (The total power consumption of IO modules should not exceed 8 W)
External Communication with the Host System
Ethernet communication⁵	Communicates with the host system using the Modbus TCP protocol at 100 Mbps
	Transfers a large amount of measurement data to the host system at high speeds
	The 2 ports allow for Ethernet connection between Accura 3700 devices.
	Wiring: Star, Daisy–chain, Ring connections (RSTP support⁶)
RS–485 communication⁷	Communicates with the host system using the Modbus RTU protocol at 1,200 – 115,200 bps

1. THD[Total harmonic distortion]. Voltage THD:

, Current THD:

:fundamental voltage,

:fundamental current
2. TDD[Total demand distortion]. Current TDD:

:peak demand current
3. When an event occurs, users can configure the corresponding digital output to operate.
4. For specific measurement parameters including energy, demand, and IO modules’ digital input and output data, the
device provides the data measured for the last 0.2 seconds by latching the data.
5. The built–in switch allows for Ethernet connection between Accura 3700 devices, without a need for an external switch.
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, and the maximum distance between the master
and the slave is 600 m.

IO Modules

Accura 3700 comes with various IO modules that can be easily connected to the back of the device. Up to four modules can be attached regardless of connection sequence, and the same types of modules can be redundantly connected. However, the sum of the power consumption of IO modules should not exceed 8 W.
Model	Number of Channels		Specifications	Power Consumption
DIO module	Digital input	8	Internal DC 24 V power supply(Self excitation), redundant circuits	2.2 W
DIO module	Digital output ¹	2	Dry contact (external excitation)	2.2 W
DI module	Digital input	12	Internal DC 24 V power supply(Self excitation), redundant circuits	3.2 W
DO module	Digital output ¹	6	Dry contact (external excitation)	0.4 W
AI module	Analog input	6	DC 0 – 20 mA	0.6 W
AO module	Analog output²	6	DC 4 – 20mA, DC 0 – 20 mA	3.6 W
A4D2 module	Analog output²	4	DC 4 – 20 mA, DC 0 – 20 mA	2.6 W
A4D2 module	Digital output ¹	2	Dry contact (external excitation)	2.6 W
A2D4 module	Analog output²	4	DC 4 – 20 mA, DC 0 – 20 mA	1.7 W
A2D4 module	Digital output ¹	4	Dry contact (external excitation)	1.7 W
RTD module	RTD input	3	PT100, PT1000 4–wire, 3–wire, 2–wire module	0.8 W
ELD module	Leakage current input	6	AC 0 – 2,000 mA	0.7 W
ELD module	Digital output ¹	1	Dry contact (external excitation)	0.7 W
DC module	DC voltage input	1	0 – 200 V	2.0 W
	DC current input	2	–100 – 100 mV(shunt resistance required)
	Digital input	4	Internal DC 24 V power supply(Self excitation), redundant circuits
	Digital output ¹	1	Dry contact (external excitation)
Model	Function		Communication	Power Consumption
TEMP module	Collects temperature data with up to 6 Accura TSEN modules that can be connected		The RJ 45 communication port is, used to connect Accura 3700 TEMP with Accura TSEN	0.9 W³
Accura TSEN	Temperature measurement with the IC temperature sensor			0.12 W
Operation
Digital input detection cycle	1 ms
Analog input detection cycle	1 ms
Analog output (measurement) control cycle	200 ms
Analog output (communication) control cycle	20 ms
Power Supply
Receives power from Accura 3700 POWER module

1. DO channels support latches, a single pulse, periodic pulses, and countable pulses.
2. AO channels output various electrical quantities measured by the device or communication command values by
converting them into values 4 – 20 mA or 0 – 20 mA.
3. It indicates the power consumption when the TEMP module is connected with 6 Accura TSEN devices.

Digital Power Quality Meter

Voltage Input
Port name	V₁, V₂, V₃, V_N
Connector type	Terminal block¹(M4 / bolt head size Ø7)
Wire specification	0.34 – 2.5 mm² (22 – 14 AWG), copper
Wire temp rating	Above 70 ˚C
Measurement catagory	III
Withstand voltage	AC 3,000 V RMS, 60 Hz for 1 minute
Impedance	10 MΩ/phase
Burden	0.01 VA/phase @ 220 V
Wiring method	3P4W, 3P3W, 1P3W, 1P2W
Current Input
Port name	1S, 2S, 3S ports on the power supply side, 1L, 2L, 3L ports on the load side (internal busbar)
Connector type	Terminal block²(M4 / bolt head size Ø9)
Wire specification	2.5 – 6.0 mm² (14 – 10 AWG), copper
Wire temp rating	Above 70 °C
Rating Input	5 A nominal/10 A full scale 3~ continuous, per UL61010, 100A for 1 second (thermal)
Burden	0.01 VA/phase @10 A
Basic Measurement
Frequency measurement	Measuring range	42 – 69 Hz
Basic measurement	Measurement cycle(gapless)	0.2sec (12 cycles @60 Hz, 10 cycles @50 Hz)
Voltage	Sampling	512 samples/cycle
	Measuring range(accuracy guaranteed)	AC 35 – 277 V L-N
		AC 60 – 480 V L-L(for unearthed Delta³ & Y systems)
	Accuracy	±0.2 % Reading
	Minimum measured value	5 V L-N / 9 V L-L
Residual voltage	Measuring method	Calculation of the sum of sampled three-phase L-N voltages
	Measurement data	RMS, Fundamental
	Accuracy / Operating range	±0.2% Un⁴ / Up to 277 V L-N
Current	Sampling	256 samples/cycle
	Measuring range(accuracy guaranteed)	1 % In – 200 % In⁵
	Accuracy	±0.2% Reading
	Minimum measured value	0.1 % In
Residual current	Measuring method	Calculation of the sum of sampled three–phase currents
	Measurement data	RMS, Fundamental
	Accuracy / Operating range	±0.2% In / Up to 200 % In of phase current
Energy	Active	Received, Delivered, Net, Sum(total) energy
	Reactive	Energy in quadrant 1, 2, 3 and 4
	Apparent	–
Demand	Current, Apparent power⁶, Active power	Demand, Peak demand, Predicted demand⁷
	Demand time setup	Demand time = Demand sub–interval * the number of demand sub–intervals
Display
LCD	Type	5.0" Color TFT LCD
	Resolution	800 x 480 pixel
	Additional features	LED backlight & touch panel
External Communication with the Host System
Ethernet communication	Protocol	Modbus TCP Protocol
	Port	2 ports, Ethernet switching⁸
	Connector type	RJ45 connector
	Communication cable	Ethernet cable Cat 5e FTP, STP, SFTP⁹
	Cable length	Up to 100 m
	Communication speed	100 Base–TX(100 Mbps/Full Duplex)
	Max. number of connected modules	20 (Daisy–chain connection)
RS–485 communication	Protocol	Modbus RTU Protocol
	Port	1port / Ta, Tb, SG(Shield–Ground)
	Connector type	Push In conductor	0.08 – 2.5 mm² (28 – 14 AWG)
	Communication cable	UL 2919 RS–485 1P/2P 24 AWG
	Cable length	Up to 1,219 m (4,000 ft)
	Communication speed	1,200 – 115,200 bps¹⁰
	Max. number of connected modules	32 per bus¹⁰
Control Power Supply(Supplied from the POWER Module)
Port name	L+, N–, G(Earth Ground)
Connector type	Push In conductor (Pluggable)
Wire specification	0.14 – 4.0 mm² (26 – 12 AWG),copper
Power supply voltage (Us)¹¹	AC 100 – 240 V, DC 100 – 300 V, CAT II
Frequency	50 / 60 Hz
Operating voltage range	0.9 x Us – 1.1 x Us
Withstand voltage	AC 3,000 V RMS, 60Hz for 1 minute
Power Consumption	Max. 7 W	IO module not connected
	Max. 15 W¹²	4 IO modules connected
Inrush current¹³	Peak 31 A, duration less than 1 ms(AC 220 V)
	Peak 11 A, duration less than 200 μs(DC 110 V)
General
Weight	700 g (including the POWER module)

1. The maximum tightening torque of the terminal screws of the barrier-type terminal is 1.1 Nm (12 kgf-cm, 10 Ibf-in).
2. The maximum tightening torque of the terminal screws of the barrier-type terminal is 1.9 Nm (20 kgf-cm, 17 Ibf-in).
3. For Delta connections, do not exceed 480 V ungrounded or 240 V corner grounded.
4. The rated voltage Un is 277 V Line-to-Neutral.
5. The rated current In is 5 A.
6. For active power demand, Received or Net active power can be selected.
7. Peak demand is calculated based on thermal demand. The response time for thermal demand can be set up.
8. The built–in Ethernet switch allows for Ethernet connection between Accura 3700 devices, without a separate external switch.
9. FTP(Foiled Shield Twisted Pair), STP(Braided Shield Twisted Pair), SFTP(Braided Foiled Shield Twisted Pair)
10. At 115,200 bps, a master can communicate with up to 16 slave devices, and the maximum distance between the master and the slave is 600 m.
11. The device conforms to UL standards for the tested AC power supply voltage.
12. It indicates the maximum power consumption of the connected modules, including Accura 3700 IO module.
13. When installing fuses on the power line, it is recommended to use UL listed Class RK5 fuses above 2 A / 500 V.

General Specifications of IO Modules

Digital Input
Item	Description
Connector type	Screw–type terminal (pluggable)
Wire specification / Torque	0.25 – 4.0 mm² (24 – 12 AWG) / max 0.51 Nm (5.2 kgf-cm, 4.5 Ibf-in)
Input type	Internal DC 24 V power supply(self–excitation)
Carried current	1st channel : 10 mA, other channels: 5 mA
Insulation	Max. AC 2000 V for 1 minute
Minimum pulse width	100 ms(Configurable)
Digital Output
Item	Description
Connector type	Screw–type terminal (pluggable)
Wire specification / Torque	0.25 – 4.0 mm² (24 – 12 AWG) / max 0.51 Nm (5.2 kgf-cm, 4.5 Ibf-in)
Output type	Dry contact (external excitation)
Maximum Rating	AC/DC 240 V 350 mA (max. 1 A)¹
Insulation	Max. AC 3,000 V for 1 minute
Output signal type	Latch, pulse, energy pulse
Minimum pulse cycle	20 ms
Minimum pulse width	10 ms
DC 0–20mA Analog Input
Item	Description
Connector type	Screw–type terminal (pluggable)
Wire specification / Torque	0.25 – 4.0 mm² (24 – 12 AWG) / max 0.51 Nm (5.2 kgf-cm, 4.5 Ibf-in)
Input type	Dry contact (external excitation)
Input type	DC current 0 – 20 mA
Internal input resistance	150 Ω
Accuracy	±0.5 % Full Scale	Full Scale: 20 mA
DC 0–20mA Analog Output
Item	Description
Connector type	Screw–type terminal (Pluggable)
Wire specification / Torque	0.25 – 4.0 mm² (24 – 12 AWG) / max 0.5 Nm (5.2 kgf-cm, 4.5 Ibf-in)
Output type	DC Current 0 – 20 mA
Allowable load resistance	Less than 450 Ω
Accuracy	±0.5 % Full Scale	Full Scale: 20 mA

1. It indicates the Peak AC or DC value. Max. 1 A indicates current flowing once during a current–carrying time of 100 ms.

Specifications of Individual IO Modules

DIO Module
Digital Input			Digital Output
Number of channels	8 (redundant circuits per channel)¹		2
Port name	DI₁ DI₂ DI₃ DI₄ DI_G / DI₅ DI₆ DI₇ DI₈ DI_G²		DO₁ DO_1G / DO₂ DO_2G³
Power Consumption	2.2 W
DI Module
Digital Input
Number of channels	12 (redundant circuits per channel)¹
Port name	DI₁ DI₂ DI₃ DI₄ DI_G / DI₅ DI₆ DI₇ DI₈ DI_G / DI₉ DI₁₀ DI₁₁ DI₁₂ DI_G²
Power Consumption	3.2 W
Module
Digital Output
Number of channels	6
Port name	DO₁ DO_1G / DO₂ DO_2G / DO₃ DO_3G / DO₄ DO_4G / DO₅ DO_5G / DO₆ DO_6G³
Power Consumption	0.4 W
AI Module
Analog Input
Number of channels	6
Port name	AI₁ AI_1G / AI₂ AI_2G / AI₃ AI_3G / AI₄ AI_4G / AI₅ AI_5G / AI₆ AI_6G⁴
Power Consumption	0.6 W
AO Module
Analog Output
Number of channels	6
Port name	AO₁ AO_1G / AO₂ AO_2G / AO₃ AO_3G / AO₄ AO_4G / AO₅ AO_5G / AO₆ AO_6G
Power Consumption	3.6 W
A4D2 Module
Analog Output			Digital Output
Number of channels	4		2
Port name	AO₁ AO_1G / AO₂ AO_2G / AO₃ AO_3G / AO₄ AO_4G		DO₁ DO_1G / DO₂ DO_2G³
Power Consumption	2.6 W
A2D4 Module
Analog Output			Digital Output
Number of channels	2		4
Port name	AO₁ AO_1G / AO₂ AO_2G		DO₁ DO_1G / DO₂ DO_2G / DO₃ DO_3G / DO₄ DO_4G³
Power Consumption	1.7 W
DC Module
DC voltage / current input
Number of channels	3
Port name	I_OUT+ I_OUT- / I_BAT+ I_BAT- / V_DC+ V_DC-⁵
DC Shunt resistance	Max. DC 100 mV
DC Voltage	Max. DC 200 V
Accuracy	±0.5 % Full Scale
Digital Input			Digital Output
Number of channels	4(redundant circuits per channel)¹		1
Port name	DI₁ DI₂ DI₃ DI₄ DI_G²		DO DO_G
Power Consumption	2.0 W
RTD Module
RTD Analog Input
Number of channels	3
Port name	a₁ A₁ B₁ b₁ / a₂ A₂ B₂ b₂ / a₃ A₃ B₃ b₃
RTD sensor	PT100, PT1000
Wiring method	4W, 3W, 2W
Accuracy	±0.5 % Full Scale		Range: -100 to 200 °C, Full Scale: 200 °C
Power Consumption	0.8 W
ELD Module
ZCT Analog Input			Digital Output
Number of channels	6		1
Port name	Z₁ Z_1G / Z₂ Z_2G / Z₃ Z_3G / Z₄ Z_4G / Z₅ Z_5G / Z₆ Z_6G⁶		DO, DO_G
Leakage current input	Voltage output type ZCT 200 mA/100 mV @ 1.2 kΩ Burden⁷
Accuracy	±0.5 % Full Scale	200 mA/100 mV, Range: 0 – 2 A, Full Scale: 2 A
Power Consumption	0.7 W
TEMP Module
RJ45 communication port	Used to connect TEMP module with Accura TSEN
Connector type	RJ45 connector / RJ45 Ethernet cable
Protocol	Internal protocol
Connection with Accura TSEN	Up to 6 Accura TSEN device can be connected in a daisy–chain.
Power Consumption	0.9 W⁸
Accura TSEN
Temperature measurement
Temperature sensor	IC temperature sensor located at the bottom end of the module
Accuracy error	typ. ±1.0 °C
Temperature measurement range	-20 – 100 °C
Response time [τ 63%]	Max. 30 seconds
RJ45 communication port	Used to connect TEMP module with Accura TSEN
Port name	RJ45A, RJ45B (The RJ45A and RJ45B ports have the same functions)
Connector type	RJ45 connector
Protocol	Internal protocol
Communication cable	Ethernet cable CAT.5e FTP(F/UTP)⁹
Cable length	Up to 100 m
Accura TSEN ID	ID that enables communication	1 – 6
	Standby ID	0 (factory default value, communication unavailable)
LED
Green	Blinks when the module operates normally
Red	Blinks when the measured temperature exceeds the threshold and an event occurs
Power Supply	Receives power from TEMP module through the RJ45 communication cable
Current consumption	15 mA
Power Consumption	0.12 W

1. Each channel features redundant circuits. Thus when two inputs differ, the module processes the event as a redundancy error
and provides maintenance notifications
2. The DI_G port is internally connected and is the common ground port of all channels.
3. Each DO channel is electrically insulated.
4. The inputs of each channel features differential inputs, and the common–mode voltage should be less than 2 V.
5. The inputs of each channel features differential inputs, and the common–mode voltage should be less than 200 V.
6. The inputs of each channel features differential inputs, and the common–mode voltage should be less than 2 V.
7. The internal resistance(default: 1.0 kΩ) and burden resistance of the ZCT(default: 1.2 kΩ) can be set up.
8. It indicates the power consumption when the TEMP module is connected with 6 Accura TSEN devices.
9. FTP(F/UTP): Foiled Shield Twisted Pair