Multi-Function Power Meter
(Demand ControlBHarmonic)

MODEL CT1700


The CT1700 is an instrument that measures, calculates and displays all main electrical parameters at any electrical network (balance or not). The measuring is true RMS value, through three AC voltage inputs and three AC current inputs (from Current Transformers ---/5A).

It was designed according to EMC and electrical safety standards, and manufactured under the ISO 9001 quality control. It is featured by its high measuring accuracy, its reduced size, and easy assembly mode and a yet economical price. It can be integrated into a communication network through its built-in-RS485/232 output by just using Modbus standard protocol. In addition, it provides two relay outputs (DO) and two alarm inputs (DI) for detection.

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FEATURE
EHarmonic distortion measurement THD-V & RTHD-A(31st)
EUp to 21st harmonic analysis of V and A
ELCD back-light display
E2-alarm input (DI)
E2-alarm output (DO) V, A, W or Demand
EDemand measurement and alarm output
EMeasurement of zero-phase current
EPrecision True-RMS measurement
ERS485/232 communication interface
EPT and CT scaling
E10-year memory for all setup and energy data
EAuto calibration from computer
EMax, Min and Hold function
EOutput DC 4 ~ 20mA and Pulse (option)
E9696158mm DIN case
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SPECIFICATION
Display: 4 digits (9999) LCD back-light(V, A, W, VAR, PF, Hz)
5 digits (99999) LCD back-light(WH, VARH)
Accuracy: (at 23 5J sine wave)
Voltage
0.1% of reading 0.1% of range
Current
0.1% of reading 0.1% of range
VA
0.2% of reading 0.2% of range
Watt
0.2% of reading 0.2% of range
Var
0.2% of reading 0.2% of range
Powe Factor
0.5% of reading
Watt Hour
0.2% of reading 1 count
Var Hour
0.2% of reading 1 count
Hz
0.05% of reading
Harmonic
0.2% of fundamental
Demand
0.4% of reading 0.2% of range
Max. input over capability
Amp. 10A continuous
50A for 5 sec.
Volt. 750V continuous
Conversion rate: (about)
about 1/sec.
Input burden
Volt. input 0.2 VA/phase
Amp. input 0.2 VA/phase
Over input indication
"OL"
Line voltage range
60V700V
Phase voltage range
35V ~ 400V
Current range
20mA ~ 6A
Power factor range
0.51
Frequency range
4565Hz
CT, PT scaling factors
19999
Setting for REF
0.001 ~ 1.000
Operating temp.
060J
Storage temp.
-1070J
Temp. coefficient
100PPM/J(60PPM/J,25J10J)
Max. relative humidity
95%
Dielectric strength
AC 2KV/1min. (input/output/power)
AC 2.8KV/1min. (input/output/power/case)
Surge test
4 KV/1.2 X 50gS, IEC 255-4
Dimensions
9696158mm
Mounting
Panel mounting
Protocol
MODBUS, RTU
Baud rate
9600/19200/38400
Address range
1255
Watt-hour data back-up time
10 years
Aux. power
AC90260V, 50/60Hz
DC24V, 48V, 110V20% (option)
Power consumption
AC6VA, DC5W
Weight (about)
760g
DIMENSION (unit: mm)
COMMUNICATE CONNECTION
RS-232C CONNECTION
The figure bellow illustrates the wiring requirements for connecting the CT1700 using RS-232C communications. This can include a local direct connecting the CT1700 using RS-232C communications. This can include a local direct connection to a computer or other device. The RS-232C standard allows only a single point-to-point communication connection. Using this method, only one RS-232C equipped device may be connected to the serial port of the computer, or other device. The cable used between the computers is a standard RS-232C communication cable with a maximum length of 50 feet (15.2m).
RS-485 CONNECTION
RS-485 communication allows multiple devices to be connected on the same bus. Up to 30 devices can be connected on a single RS-485 bus, which consists of a shield twisted pair cable. The overall length of the RS-485 cable connecting all devices cannot exceed 4000 feet (1219m).
TERMINAL BOARD OF OUTPUT
(OPTION)
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WIRING DIAGRAM OF INPUT
A. 3 Phase 3 Wire with 2 CTs, 2 PTs
D. 1 Phase 2 Wire with 1 CT, no PTs

B. 3 Phase 3 Wire with 3 CTs, 2 PTs

E. 1 Phase 3 Wire with 2 CTs, no PT

C. 3 Phase 4 Wire with 3 CTs, 3 PTs
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ORDERING INFORMATION
CT1700 w
NO
INPUT
NO
OUTPUT 1
NO.
AUX. POWER
NO.
DI / AO
A
600V/346V, 5A
A
RS-485
A
AC 90 ~ 260V, 50/60Hz
A
DI 1 + DI 2
Y
OPTION
B
RS-232
Y
OPTION
B
Pulse + DI 2
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Y
OPTION
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CHITAI ELECTRONIC CORPORATION
5FL., NO.1, LANE 123, PAO-CHUNG RD., HSINTIEN CITY 231, TAIPEI, TAIWAN, R.O.C
TEL: (02)2917-6689 FAX: (02)2913-0526