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Digital Power Quality Meter

Display
Shows real–time measurement data on the LCD screen
Voltage
Line–to–neutral voltage, Line–to–line voltage, Fundamental frequency, Harmonics, Phasor diagram, THD¹, Symmetrical components(positive–, negative–, zero–sequence),Voltage unbalance based on symmetrical components, voltage unbalance according to the NEMA standard, Residual voltage
Current
Phase current, Fundamental frequency, Harmonics, Phasor diagram, THD¹, TDD², Symmetrical components(positive–, negative–, zero–sequence), Current unbalance based on symmetrical components, Current unbalance according to the NEMA standard, Residual current
Power
Active, Reactive, and 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, Data available via the device’s LCD screen: 2 cycles of waveforms
Events
Power quality events³	Dip/Swell
	PQ Curve
	Up to 500 power quality events can be saved
Voltage connection events ³	Determines the occurrence of the event based on the voltage/ current data measured for 0.2 seconds (definite time: 5 seconds)
	Phase Open event
	Fuse Fail event
	Up to 500 measurement events can be saved(voltage connection and custom events)
Custom events³	Events for which users set up event input data, thresholds, and detection methods
	Up to 80 events can be set up
	Event input data		Data measured at 0.2–sec intervals
			Users can select among Voltage/Current/ Power/ Etc.
	Threshold	Set by users
	Detection method	Over and Under condition set by users
System events	Events on module control, communication status, and setup
	Up to 1000 system events can be saved
Aggregation of Measurement Data
Aggregation intervals	Fixed intervals	Supports 6 fixed 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 during each aggregation interval
	Max/Min value	Max/Min value of the values measured for 0.2 seconds during each aggregation interval
Data displayed on the LCD screen	Average value	Average values of the values measured for 0.2 seconds during the 1–second aggregation interval
	Max/Min value	Max/Min value among the average values obtained during the 1–second aggregation interval after resetting the Max/Min value
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 connected to the back of the meter	4 (The total power consumption of IO modules should not exceed 8 W)
Temperature
Number of the temperature sensor⁴	1( internally located on the side of the meter)
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 communication	Communicates with the host system using the Modbus RTU protocol at 1200 – 115200 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. It is not for fire detection, but for reference only(Accura 3700 has a temperature sensor on the side).
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

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
Accura 3700 DIO module	Digital input	8	Internal 24 Vdc power supply(Self excitation), redundancy	2.2 W
Accura 3700 DIO module	Digital output ¹	2	Dry contact (external excitation)	2.2 W
Accura 3700 DI module	Digital input	12	Internal 24 Vdc power supply(Self excitation), redundancy	3.2 W
Accura 3700 DO module	Digital output ¹	6channels	Dry contact (external excitation)	0.4 W
Accura 3700 AI module	Analog input	6	DC 0 – 20mA	0.6 W
Accura 3700 AO module	Analog output²	6channels	DC 4 – 20mA, DC 0 – 20mA	3.6 W
Accura 3700 A4D2 module	Analog output²	4	DC 4 – 20mA, DC 0 – 20mA	2.6 W
Accura 3700 A4D2 module	Digital output ¹	2	Dry contact (external excitation)	2.6 W
Accura 3700 A2D4 module	Analog output²	4	DC 4 – 20mA, DC 0 – 20mA	1.7 W
Accura 3700 A2D4 module	Digital output ¹	4	Dry contact (external excitation)	1.7 W
Accura 3700 RTD module	RTD input	3	PT100, PT1000 4–wire, 3–wire, 2–wire module	0.8 W
Accura 3700 ELD module	Leakage current input	6	AC 0 – 2,000mA	0.7 W
Accura 3700 ELD module	Digital output ¹	1	Dry contact (external excitation)	0.7 W
Accura 3700 DC module	DC voltage input	1	0 – 200V	2.0 W
	DC current input	2	–100 – 100 mV(shunt resistance required)
	Digital input	4	Internal 24 Vdc power supply(Self excitation), redundancy
	Digital output ¹	1	Dry contact (external excitation)
Model	Function		Communication	Power Consumption
Accura 3700 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 msec
Analog input detection cycle	1 msec
Analog output (measurement) control cycle	200 msec
Analog output (communication) control cycle	20 msec
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 between 0 and 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, VN
Connector type	Terminal block¹
Wire specification	2.1 to 3.5 mm² (14 to 12 AWG)
Measurement Catagory	III
Withstand voltage	AC 2,000 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 block¹
Wire specification	2.1 to 6.0 mm² (14 to 10 AWG)
Rating	5A nominal/10A full scale 3~
Burden	0.01 VA/Phase @10 A
Basic Measurement
Frequency measurement	Measuring range	42 – 69 Hz (50/60 Hz)
Basic measurement	Measurement cycle(gapless)	0.2sec (12 cycles @60Hz, 10 cycles @50Hz)
Voltage	Sampling	512 samples/cycle
	Measuring range(accuracy guaranteed)	60 – 520 V Line–to–line
		35 – 300 V Line–to–neutral
	Accuracy	±0.2 % Reading
	Minimum measured value	5 V Line–to–neutral(based on the secondary voltage of the PT when external PTs are connected)
Residual voltage	Measuring method	Calculation of the sum of sampled three–phase line–to–neutral voltages
	Measurement data	RMS, Fundamental
	Accuracy / Operating range	±0.2% Un² / Up to 300 V Line-to-neutral
Current	Sampling	256 samples/cycle
	Measuring range(accuracy guaranteed)	1 % In – 200 % In³
	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 power⁵, Active power	Demand, Peak demand, Predicted demand⁴
	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 switching⁶
	Connector type	RJ45 connector
	Communication cable	Ethernet cable Cat 5e FTP, STP, SFTP⁷
	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 TCP Protocol
	Port	1port / Ta, Tb, SG(Shield–Ground)
	Connector type	Push In conductor	0.13 – 1.5 mm² (26 – 16 AWG)
	Communication cable	UL2919 RS–485 1P/2P 24 AWG
	Cable length	Up to 1219 m (4000 ft)
	Communication speed	1200 – 115200 bps⁸
	Max. number of connected modules	32 per bus⁸
Control Power Supply(Supplied from the POWER Module)
Port name	L+, N–, G(Earth Ground)
Connector type	Push In conductor (Pluggable)
Wire specification	0.2 – 4.0 mm² (24 – 12 AWG)
power supply voltage(Us)	AC 100 – 240 V 50/60Hz, DC 110 – 300 Vdc
Operating voltage range	0.9 x Us – 1.1 x Us
Withstand voltage	AC 2000 V RMS, 60Hz for 1 minute
Power Consumption	Max. 7 W	IO module not connected
	Max. 15 W⁹	4 IO modules connected
Inrush current¹⁰	Peak 22 A, duration less than 1 msec(AC 220 V)
	Peak 11 A, duration less than 200 μsec(DC 110 Vdc)
General
Weight	700 g (including the POWER module)

1. The maximum applicable torque for the terminal screw of the barrier–type terminal is 1.4 Nm (14 kgf–cm).
2. The basic voltage Un is 280V
3. The basic current In is 5 A.
4. Peak demand is calculated based on thermal demand. The response time for thermal demand can be set up.
5. For active power demand, Received or Net active power can be selected.
6. The built–in Ethernet switch allows for Ethernet connection between Accura 3700 devices, without a separate external switch.
7. FTP(Foiled Shield Twisted Pair), STP(Braided Shield Twisted Pair), SFTP(Braided Foiled Shield Twisted Pair)
8. Up to 16 devices can be connected per bus at 115200 bps.
9. It indicates the maximum power consumption of the connected modules, including Accura 3700 IO module.
10. When installing a fuse at the voltage line, it is recommended to use a fuse above 2A/500V due to inrush current.

General Specifications of IO Modules

Digital Input
Item	Description
Connector type	Screw–type terminal (Pluggable)
Wire specification	0.21 to 3.5 mm² (24 to 12 AWG)
Input type	Internal 24 Vdc 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	10 msec
Digital Output
Item	Description
Connector type	Screw–type terminal (Pluggable)
Wire specification	0.21 to 3.5 mm² (24 to 12 AWG)
Output type	Dry contact (external excitation)
Maximum Rating	AC/DC 400 V 350 mA (max. 1 A)¹
Insulation	Max. AC 2000 V for 1 minute
Output signal type	Latch, periodic pulse, single pulse, countable pulse
Minimum pulse cycle	20 msec
Minimum pulse width	10 msec
DC 0–20mA Analog Input
Item	Description
Connector type	Screw–type terminal (Pluggable)
Wire specification	0.21 to 3.5 mm² (24 to 12 AWG)
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	0.21 to 3.5 mm² (24 to 12 AWG)
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

Accura 3700 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
Accura 3700 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
Accura 3700 DO 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
Accura 3700 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
Accura 3700 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
Accura 3700 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
Accura 3700 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
Accura 3700 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. 100 mVdc
DC Voltage	Max. 200 Vdc
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
Accura 3700 RTD Module
RTD Analog Input
Number of channels	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 – 200 °C, Full Scale: 200 °C
Power Consumption	0.8 W
Accura 3700 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, DOG
Leakage current input	Voltage output type ZCT 200 mA/100 mV @ 1.2 kΩ Burden⁷
Accuracy	±0.5 % Full Scale	200mA/100mV, Range: 0 – 2 A, Full Scale: 2 A
Power Consumption	0.7 W
Accura 3700 TEMP Module
RJ45 communication port	Used to connect Accura 3700 TEMP 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 W¹⁰
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 Accura 3700 TEMP 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)⁸
Cable length	Up to 25m
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 a start event occurs
Power Supply ⁹	Receives power from Accura 3700 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 DIG 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. FTP(F/UTP): Foiled Shield Twisted Pair
9. Accura TSEN receives power from Accura 3700 TEMP module through the communication cable.
10. It indicates the power consumption when the TEMP module is connected with 6 Accura TSEN devices.