YOKOGAWA PR201 User Manual

User’ s
Manual

IM 77C01C01-01E

Model PR201
Power Monitor

IM 77C01C01-01E

1st Edition

Blank Page

1

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ How to Install

NOTE

(1) To install the product, select a location where:

• no one may accidentally touch the terminals,

• mechanical vibrations are minimal,

• corrosive gas is minimal,

• Ambient temperature: 0 to 50°C; Ambient humidity: 50 to 90%RH
And the fluctuation is minimal,

• no direct radiant heat is present,

• no magnetic disturbances are caused,

• no wind blows against the terminal board (reference junction compensation ele­ment),

• no water is splashed,

• no flammable materials are around,

(2) Make sure to connect the grounding.
(3) Turn off the product before installation and wiring.
(4) Use the power supply within specifications.
(5) Observe the following instructions for correct installation:

Recommended panel thickness is 1 to 10mm.
Install the product horizontally .
Install the product using attached fixture from the backside of the product.
Turn the screw only up to 180° after the screw touches the mounting panel to prevent
the case deformation by tightening the screw excessively .

(6) Observe the following instructions for correct wiring:

M3 screw terminal connection (output, communication, optional integrated control
signal)
M4 screw terminal connection (input, power supply)
Applicable wire size for input signal and power supply is 1.25mm

2

or more of cross

sectional area.

2

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ Model and Suffix Codes

PR201-䊐䊐䊐䊐䊐-20

Model
Phase & Wire Type

1: 1-phase 2-wire system
2: 1-phase 3-wire system (Note 1)
3: 3-phase 3-wire system
4: 3-phase 4-wire system

Output Function

0: None
1: Analog output
2: Integrated pulse output

Communication Output Function

0: None
1: RS-485 Communication Output
2: LON Communication Output

Optional Function

0: None
1: Power Factor Measuring Function
2: Current 2 Measuring Function (Note 5)

Power Supply

2: 85 to 264V AC

Rated Input Voltage / Current

1: 110V/1A (Note 2) A: 64V (110V/√3) /1A (Note 4)
2: 110V/5A (Note 2) B: 64V (110V/√3) /5A (Note 4)
3: 220V/1A (Note 1) C: 127V (220V/√3) /1A (Note 4)
4: 220V/5A (Note 1) D: 127V (220V/√3) /5A (Note 4)
5: 440V/1A (Note 3) E: 277V (480V/√3) /1A (Note 4)
6: 440V/5A (Note 3) F: 277V (480V/√3) /5A (Note 4)

(Note 1) Input specs. of 1-phase 3-wire system can only select rated input 3 and 4. Input voltage is 200VAC (100V+100V).
(Note 2) Rated input 1, 2 (110V) can also be used at 120V input.
(Note 3) Rated input 5, 6 (440V) is the specs. only for 1-phase 2-wire system and 3-phase 3-wire system.
(Note 4) Rated input A to F is the specs. for only 3-phase 4-wire system. Rated input voltage indicates phase voltage.

A, B: 64V , C, D: 127V, E,F: 227V indicate 110V/√3, 220V/√3, 480V/√3 respectively. In case of 440V/√3 input, it can
be used at E, F: 227V of rated input.

(Note 5) Specify this option when the previous style UZ005(S2.0) with option “Current 2 measuring Function” is required.

Current measuring object of current 2 measuring function:

1-phase 3-wire system : I2current r.m.s. value
3-phase 3-wire and 3-phase 4-wire system : I3 current r.m.s. value

NOTE

Before using the product, check that its model and suffix codes as you ordered.

LIST OF COMBINATION OF PR201 RATED INPUT

䊊: Available :Not available *200V AC (100V+100V)

Phase & Wire System

1-phase 2-wire

Rated InputCode

1-phase 3-wire

3-phase 3-wire

3-phase 4-wire

䊊

䊊

䊊

䊊

䊊

䊊

110V/1A
110V/5A
220V/1A
220V/5A
440V/1A
440V/5A

64V/1A

64V/5A
127V/1A
127V/5A
277V/1A
277V/5A

1
2
3
4
5
6
A
B
C
D
E
F

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊

䊊*
䊊*

3

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ External Dimensions and Panel Cutout Dimensions

● External Dimensions

R
S
T

kWh
Wh
W

V
A

×10

6

×10

3

COMM

COS

φ

SET/ENT

110

110

0.5

15

15

66

82.4
96

45

Panel Thickness
1 to 10

2-Bolt M5

45

45

45

9-Screw M3

10-Screw M4

4-Screw M4

Short Bar
(When short-ciruit,

end terminal ON)

Unit: mm

● Panel Cut Dimension

Minimum130

45±0.3 45±0.3

45±0.345±0.3

Minimum 117

φ101 Hole

2-φ6 Hole

4

IM 77C01C01-01E 1st Edition : March 5 2001-00

■ Mounting the Product

CAUTION

Turn off the power to the product before installing it on the panel because there is a possi­bility of electric shock.

After opening the mounting hole on the panel, follow the procedures below to install the
product:

1. Insert the product into the opening from the front of the panel so that the terminal
board on the rear is at the far side.

2. Set the brackets in place on the top and bottom of the product as shown in the figure
below, then tighten the screws of the brackets. T ake care not to overtighten them.

Insert the product
into the opening at
the front of the panel

Directionm to insert
the product

■ T erminal Arrangement

10

8

6

4

2

9

7

5

3

1

23

22

21

20

19

18

17

16

15

12

11

14

13

F05.EPS

T14.EPS

1-phase

2-wire

TML

No.

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

1S

1L

P1
P2

1-phase

3-wire

1S
1L
2S
2L

P1
P0
P2

+

–

A
B
C

+

–

L
N

GND

3-phase

3-wire

Signal

Input

Output

Communication

Communication

Terminating

Power Supply

Optional Integrated

Control Signal

1S
1L
3S
3L

P1
P2
P3

3-phase

4-wire

1S
1L
2S
2L
3S
3L
P1
P0
P2
P3

5

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ Wiring Diagrams

Voltage

or

Contact

2

Power Side

Load Side

K

1S
1L

P1
P2

PT

CT

L

L

N

GND

Power Supply

A
B
C

+

+

-

-

1

1
3
5
7
9

2
4

6
8

10

20

19

18

17

16

15

14

13

12

11

21
22
23

+ Receiver

-

Device

Communication
Shield

Short Terminating

(R)

(S)

N

K

1S

1L

P1

2S

2L

P2

PT

CT

L

K

CT

L

L

N

GND

A
B
C

12

1
3
5
7
9

2
4

6
8

10

19

18

17

16

15

14

13

12

11

20
21

22
23

Voltage

or

Contact

Power Side

Load Side

Power Supply

+

-

+

-

+ Receiver

-

Device

Communication
Shield

Short Terminating

(R) (S) (T)

1 phase 2 wire system 1 phase 3 wire system

2

K

1S
1L

P1

3S
3L

P3

P2

PT

CT

L

K

CT

L

L
N

GND

A
B
C

13

1
3
5
7
9

2
4

6
8

10

19

18

17

16

15

14

13

12

11

20
21

22
23

Voltage

or

Contact

Power Side

Load Side

Power Supply

+

-

+

-

Communication
Shield

Short Terminating

(R) (S) (T)

+ Receiver

- Device

A
B
C

L

N

GND

N3

2

PT

CT

K

L

K
L

CT

1

K
L

CT

1
3
5
7
9

2
4

6
8

10

19

18

17

16

15

14

13

12

11

20
21

22
23

Voltage

or

Contact

Power Side

Load Side

Power Supply

+

-

+

-

Communication
Shield

Short Terminating

(R)

(S) (T)

+ Receiver

-

Device

3 phase 3 wire system 3 phase 4 wire system

CAUTION

The following caution for safety should be taken for handling of product. We are not respon­sible for damage incurred by use contrary to caution.

• The following items should be checked before turning power on. Use of product
ignoring specifications may cause over heating or burning.
(a) V oltage of power supply and input value applied to the product should meet with

required specifications.

(b) External wiring to terminals should be connected correctly .

(See precding Article 4)

• When take off wiring from the product, check to see primary side of CT , PT and power
supply is in OFF status. If CT secondary side is in OPEN status during operation, be
careful for danger of high voltage.

• Do not use the product in such dangerous places where exist inflammable and explo­sive gas or steam.

6

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ Outline of Each Section

Panel switch

Status indicator
(LED-RED)

Data display
(7seg LED)

SET/ENT

11

13

12

1

3

14

2

4

6

7

5

9

8

10

1 kWh (Integration)

Light on when data on Display Section is inte­grated power [kWh].

2 Wh (Optional Integration)

Light on when data on Display Section is optional
integrated power [Wh].

3 W (Power)

Light on when data on Display Section is power
momentary value [W].

4 V (V oltage)

Light on when data on Display Section is voltage
momentary value [V].

5 A (Current)

Light on when data on Display Section is current
momentary value [A].

6 cos φ

Light on when data on Display Section is power
factor momentary value [cos φ].

7X 10

3

Light on when data value on Display Section is kilo
unit. And light on when integrated power value is
mega unit.

8X 10

6

Light on when data value on Display Section is
mega unit.

9 COMM

Light on during communication (RS-485 commu­nication) is made.

10 Display Section

Display measured value data, preset parameter
symbol, set value data, adjustment parameter
symbol, adjustment data and the like.

(1) Measurement items: integrated power, op-

tional integrated power, power momentary
value voltage momentary value, current mo­mentary value, power factor momentary value

(2) Setting items: RS-485 station number, data

transmission rate, lower limit of input range,
upper limit of input range, PT ratio, CT ratio, in­tegrating low cut power, integrating pulse unit
(fixed point part, exponent), integrating pulse
ON pulse duration

(3) Adjustment items: power momentary value in-

put zero, power momentary value input
span,voltage momentary value input zero, volt­age momentary input span, current momen­tary value input zero, current momentary value
input span, power momentary value input
zero, power momentary value input span

11

SET/ENT

SET/ENT Switch

This switch is used for changing over displays of
screens and items. It is also used for registration of
set values and adjusted values. Pressing the
switch for 3 seconds or more changes over the dis­plays for measured value, parameter setting, or
input/output adjusting.

12 Range Switch

This switch is used for changing over display of
phases. It is also used for shifting digit position and
decimal position of set values on parameter setting
display .

13 Figure UP switch

This switch is used for the followings:

1. Increase the set value on parameter setting
display .

2. Display the maximum value of voltage or cur­rent.

3. Increase the adjusted value at input/output ad­justment. I

14 Figure DOWN switch

This switch is used for the followings:

1. Parameter decrement at parameter setting.

2. Display the minimum value of voltage or current

3. Decrease the adjusted value at input/output adjust­ment

7

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ Schematic Diagram of Change-over Display Screen

Integrated power

Measured Value Display Screen

Optional integrated

power

Instantaneous power

value

Voltage r.m.s. value

Current r.m.s. value

Instantaneous power

factor value

[kWh] display

[Wh] display

[W] display

[V] display

[A] display

[cosf] display

Input/Output Adjust Screen

Instantaneous power input

zero level adjust

Instantaneous power input

span level adjust

Instantaneous voltage input

zero level adjust

Instantaneous voltage input

span level adjust

Instantaneous current input

zero level adjust

Instantaneous current input

span level adjust

Optional instantaneous input

zero level adjust

Optional instantaneous input

span level adjust

Analog output zero level adjust

Analog output span level adjust

Parameter Setting Screen

PT ratio setting

CT ratio setting

Integrated low-cut power setting

Turn-off mode ON/OFF setting

Turn-off mode time setting

Input scaling “L” level setting for analog output *4

Input scaling “H” level setting for analog output *4

Integrated pulse unit mantissa setting *4

Integrated pulse unit characteristic setting *4

Integrated pulse ON width setting *4

RS-485 communication protocol setting *4

RS-485 station number setting *4

RS-485 data baud rate setting *4

LON communication node number setting *4

LON communication integrated power data

transmission period setting (minute) *4

LON communication integrated power data

transmission period setting (second) *4

LON communication power data transmission

period setting (minute) *4

LON communication power data transmission

period setting (second) *4

LON communication max/min.

Data transmission period setting (minute) *4

LON communication max/min.

Data transmission period setting (second) *4

*2 *3

*1

SET/ENT

Screen Development Sequence Key used

SET/ENT

Screen Development Sequence Key used

SET/ENT

Screen Development Sequence Key used

*1: Press SET/ENT key till the PT Ratio Setting Screen is displayed.

*2: Press SET/ENT key till the Instantaneous Power Input Zero Level Adjust Setting Screen is displayed.

*3: Press SET/ENT key till the last MEASURED VALUE DISPLAY SCREEN is displayed.

*4: By-passed if option is none.

*: If no key operation continues during five minutes when INPUT/OUTPUT ADJUST DISPLAY SCREEN

or PARAMETER SETUP DISPLAY SCREEN are displayed, the display screen changes to

VALUE DISPLAY SCREEN and displays the last measured value.

8

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ Example of Parameter Setting Screen (PT Ratio Setting)

SET/ENT

SET/ENT

SET/ENT

1, 3, 6

2, 4

5

7

SET/ENT

SET/ENT

1

Display Setting Screen at pressing key within three seconds

2

Change decimal point position at pressing key

3

Fixing decimal point position at pressing key

4

Change numeral column at pressing key

5

Change numeral column at pressing and key

6

Fixing numeral value at pressing key

7

Light on and off of setting value.

8

If the setting is complete correctly, press key.

If required correcting, press any of key, key, and key,
then repeat from step

1

.

■ Example of Communication Connection

RS232-C Converter

RS232-C Cable

Short-circuit
terminating

13 14 15

13 14 15

16 17

A –

A –

B +

B +

SG

Shield

13 14 15

Power monitor # 1

Power monitor # 2

Power monitor # N (N31)

PR201

A –

B +

Shield

A –

B +

Shield

9

IM 77C01C01-01E 1st Edition : March 5.2001-00

■ Specifications

When outer set of PT, CT, check to see the primary side input

power is less than 10000 MW and the value
calculated by the formula below is within above
input measuring range list.

Input range (W) =

Primary side input power (W)

(PT ratio) x (CT ratio)
Rated power factor: LEAD 0.5 to 1 to LAG 0.5
<Optional integrated control signal>
Input point: 1 point
Input signal: contact or voltage

Contact signal

ON signal
OFF signal

below 200‰
over 100k‰

Voltage signal

–1V DC, below 200‰

4.5 to 25V DC

ON signal: Optional integration start (reset, integration start)
OFF signal: Optional integration stop

(Note) Control of optional integration can also be made

through communication. Control by communication is
once made, only control by communication is once
made, only control by communication is made
thereafter.

Integratad lowcut power: Integrated lowcut power below

lowcut power is not made by integrated power,
optional integrated power and integrated pulse
output. Set integrated lowcut power for input to
this instrument .

Parameter setting

screen item

Setting

range

Integrated lowcut power

Fixed decimal point

0.5W when shipment0.1 to 99.9W

Output Specs.

Output point: 1 point (commonly used for analog and

integrated pulse outputs)
<Analog Output>
Function: Conversion of output instantanous power into DC

current.
Output signal (instantanous power) : 4 to 20mA DC
Permissible load resistance: 0 to 750Ω
Input scaling: Indicates instantanous power range to be

converted. Input scaling can be set by “H” and

“L” levls of analog output on parameter setting

screen. Set “L” and “H” levels within measur-

ing range of this instrument. Also set span

(difference between “L” level and “H” level) so

as it would be more than 50% of rated power. If

not specified when ordering, it would be shipped

“L” level at OW, and “H” level at rated power

(W).
<Integrated pulse output>
Function: Outputs pulse in proportion to integrated power
Output signal: Open collector
Output capacity: 200mA, 30V DC
Integrated pulse unit: Indicates actual kWh corresponding 1

pulse input to this instrument. It can be set

through integrated pulse unit characteristic and

mantissa sections on parameter setting screen.

● Input & Output Specifications

Input Specs.

Phase & wire system: 1-phase 2-wire system, 1-phase 3-wire

system, 3-phase 3-wire system, 3-phase 4-wire

system
Input frequency: 45 to 65Hz
Rated input voltage: 110V AC, 220V AC, 440V AC,

3-phase 4-wire system: 64V AC, 127V AC,

277V AC
Permissible Input voltage: 1.2 times of rated voltage

(continuous) , 1.5 times (10 seconds)
Rated input current: 1A AC, 5A AC
Permissible Input current: 1.2 times of rated current

(coninuous) , 2 times (10 seconds),

10 times (3 seconds)
Input (power) measuring range (secondary side of PT, CT

when CT, PT are set)

• 1-phase 2-wire system

Input (AC) Input range

App. Consumed VA
Voltage Current

0.2VA

0.4VA 0.2VA

0.8VA

RP

110V/1A
110V/5A
220V/1A
220V/5A
440V/1A
440V/5A

100W
500W
200W

1000W

400W

2000W

-120 to +120W

-600 to +600W

-240 to +240W

-1200 to +1200W

-480 to +480W

-2400 to +2400W

• 1-phase 3-wire system

Input (AC) Input range

App. Consumed VA

Voltage Current

0.2VA/
phase

0.2VA/
phase

RP

200V/1A
200V/5A

200W

1000W

-240 to +240W

-1200 to +1200W

• 3-phase 3-wire system

Input (AC) Input range

App. Consumed VA

Voltage Current

0.2VA/
phase

0.4VA/
phase

0.2VA/
phase

0.8VA/
phase

RP

110V/1A
110V/5A
220V/1A
220V/5A
440V/1A
440V/5A

200W

1000W

400W

2000W

800W

4000W

-240 to +240W

-1200 to +1200W

-480 to +480W

-2400 to +2400W

-960 to +960W

-4800 to +4800W

• 3-phase 4-wire system

Input (AC) Input range

App. Consumed VA

Voltage Current

0.2VA/
phase

RP=Rated Power

0.4VA/
phase

0.1VA/
phase

0.2VA/
phase

0.2VA/
phase

0.5VA/
phase

RP

110V/1A
110V/5A
220V/1A
220V/5A

64V/1A

64V/5A
127V/1A
127V/5A
277V/1A
277V/5A

300W

1500W

600W

3000W

200W

1000W

400W

2000W

800W

4000W

-360 to +360W

-1800 to +1800W

-720 to +720W

-3600 to +3600W

-240 to +240W

-1200 to +1200W

-480 to +480W

-2400 to +2400W

-960 to +960W

-4800 to +4800W

10

IM 77C01C01-01E 1st Edition : March 5.2001-00

Setting range

Rated
power

100W
200W
300W
400W
500W
600W

800W
1000W
1500W
2000W
3000W
4000W

5.556 × 10

-6

to 1.000 × 10-1kWh/pulse

6.667 × 10

-6

to 1.000 × 10-1kWh/pulse

1.000 × 10

-5

to 1.000 × 10-1kWh/pulse

1.334 × 10

-5

to 1.000 × 10-1kWh/pulse

2.000 × 10

-5

to 1.000 × 10-1kWh/pulse

2.667 × 10

-5

to 1.000 × 10-1kWh/pulse

(Note) When power OFF , integrated power on display is

maintained. As for integrated pulse output, error of
less than 1 pulse of integrated power arises.

Integrated pulse ON pulse width: Indicates ON time of pulse to

output. It can be set on parameter setting screen.
Set it so as not to exceed maximum ON pulse
widthe obtained by the formula below:

Maximum On pulse width (ms)

= pulse unit [kWh/pulse] x 3600 x 1000

2

-10

rated power [W] x 1.2

Setting range Remarks

10 to 1270ms Set at 10ms unit

Initial value if not specified

50ms

● Communication Output specs.

Output point:1 point (Commonly use for RS-485 and LON

communications)

Function:Refer “Communication Output”

● Standard Performance

Accuracy rating: Instantanous power, voltage r.m.s. value,

current r.m.s. value ±0.5% of rated value (at
23°C±2°C)
(Equivalent JIS C 1102 0.5 grade)
Integrated power energy
±(Power measuring accuracy+0.5% of rdg) (at
23°C±2°C)
Power factor
±2% of rated value (at 23°C±2°C)
Analog output
±0.5% of span (at 23°C±2°C)
(Equivalent JIS C 1111 0.5 grade)
However, ±1% of span in case span is 50 to 80%
of rated power.

Optional integrationg function: This function integrates power

energy during the time optional integration starts
to operate and display it by digital. There are 2
methods to control optional integration, one is
made through optional integrating control signal
and the other is made through communication.
When optional integration control is made through
commuication, optional integrationg control signal
thereafter becomes invalid. Therefore, make
control through either one of the above 2 methods.
When optional integration changes over from stop
to start, integration starts after optional integrated
power is reset.

Backup when power off (power meter): Integrated power holds

last integrated value when power off. Optional
integration has not this function.

Response speed of instantanous power (analog output): Within

1 second (until enter into ±1% of last value)

Up date of transmit data: Power, voltage, current, power factor

within 500ms

Insulation resistance: 100MΩ (500V DC) between any two

points of voltage input, current input, optional
integrated control signal, output, communication
output, power supply and ground

Withstand voltage: 2000V AC/minute between any two points

of voltage input, current input, output, power
supply and ground 2000V AC/minute between
communication output and (input, power supply)
1000V AC/minute between communication output
and (output, ground).
500V AC/minute between optional integrated
control signal and (input, output, communication
output, power supply and ground)

Impulse withstand voltage: 5kV (1.2/50µs) between input and

output, input and ground, power supply and
ground

Temperature range: -10 to 55°C
Humidity range: 5 to 90% RH (no condensation)
Effect of power supply voltage fluctuation: ±0.3% of RV

(instantanous value)/85 to 264V AC
±1.0% of RV (power factor)/85 to 264V AC

Effect of temperature change: ±0.5% of RV (instantanous

value)10°C
±2.0% of RV (power factor)/10°C

Effect of input frequency: ±0.3% of RV (instantanous value)/45

to 65Hz
±1.0% of RV (power factor)/45 to 65Hz

(RV=Rated Value)
Power voltatge: 85 to 264V AC, 45 to 65Hz
Power dissipation: 6VA (at 100V AC)

8VA (at 200V AC)

● Display Operation

PT ratio CT ratio:

Setting of PT and CT ratio makes display

converting input of this instrument into primary

side input value of PT and CT.

Setting can be done on parameter setting screen.

PT ratio setting range CT ratio setting range

1 to 32000 0.05 to 32000

Integrated power:

䊐䊐䊐䊐䊐[kWh] or 䊐䊐䊐䊐䊐[MWh]

(w/o symbol, partially fixed decimal point integer

5 digits)

Input power rating

x PT ratio x CT ratio

30W to 99999kW
100kW to 999.99kW
1MW to 9.9999MW
10MW over

Display, decimal point

0 to 99999kWh

0.00 to 999.99MWh (kWh+10

3

)

0.0 to 9999.9MWh (kWh+10

3

)

0 to 99999kWh (kWh+10

3

)

Inregrated power data is reset to zero when the data exceed

maximunm display value.

11

IM 77C01C01-01E 1st Edition : March 5.2001-00

Optional integrated power:

䊐䊐䊐䊐䊐[Wh] (w/o symbol, integer 5 digits)

Instantanous power:

±䊐䊐䊐.䊐[W] to ±䊐䊐䊐䊐[MW] (w/symbol.
floating decimal point 4 digits, minimum
resolution:0.1W)

Voltage r.m.s. value:

䊐䊐䊐.䊐[V] to 䊐䊐䊐䊐[kV] (w/o symbol, floating
decimal point 4 digits, minimum resolution:0.1V)

Current r.m.s. value:

䊐.䊐䊐䊐[A] to 䊐.䊐䊐䊐[kA] (w/o symbol,
floating decimal point 4 digits, minimum
resolution:0.001A)

Voltage maximum value:

—

䊐䊐䊐.䊐[V] to —䊐䊐䊐䊐[kV] (w/o symbol,
floating decimal point 4 digits, minimum
resolution:0.1V)

Voltage minimum value:

—

䊐䊐䊐䊐[V] to —䊐䊐䊐䊐[kV] (w/o symbol,
floating decimal point 4 digits, minimum
resolution:0.1V)

Current maximum value:

—

䊐.䊐䊐䊐[A] to —䊐.䊐䊐䊐[kA] (w/o symbol,
floating decimal point 4 digits, minimum
resolution:0.001A)

Instantanous power factor:

d䊐.䊐䊐䊐 to 1.000 to G䊐.䊐䊐䊐[COSφ]
(w/o symbol, fixed decimal point 4 digits,
minimum resolution:0.001COSφ, d:Lead, G:Lag)

kWh LED: Light on during display of integrated power

[kWh].

Wh LED: Light on during display of optional integrated

power [Wh].

W LED: Light on during display of instantanous power [w].
V LED: Light on during display of voltage r.m.s. value

[V].

A LED: Light on during display of current r.m.s. value [A].
COSφ LED: Light on during instantanous power factor [COSφ]
X10

3

LED: Light on when displaying instantanous value is

kilo unit. Or lighton when integrated power [kWh]
is Mega unit.

X10

6

LED: Light on when displaying instantanous value is

mega unit.

COMM LED: Green light on when RS-485 or LON communi-

cation. As for LON communication, red light on
and off when network parameter is under
construction, and red light on when communica­tion trouble or service.

SET/ENT Switch: This switch changes-over display of

integrated power, optional integrated power,
instantanous power, voltage r.m.s. value, current
r.m.s. value and instantanous power factor. Also, it
selects parameter setting item and input/output
adjust item.

R, S, T (phase indicator)
Light on phase that the data is displayed in data display.
Current display: R, S, T
Voltage display: R-S, S-T, T-R

R, S, T (3-phase 4-wire system)

(Range switch)

This switch is used for display line change-over,
and for movement column position of setting data
and decimal point position.

(Numeric up switch)

This switch is used for increment of setting
parameter and input/output adjustment data.

(Numeric down switch)

This switch is used for decrement of setting
parameter and input/output adjustment data.

Note 1: Instantanous power value is displayed with symbol in

case only negative.

Note 2: When display of maximum value, ‘—’ is displayed at

the top with light on and off.

Note 3: When display of minimum value, ‘—’ is displayed at

the top with light on and off.

Note 4: Instantanous power factor is displayed only when

measuring option is designated.

● Communication Output

RS-485 or LON communication outputs can optionally be

selected
<Communication data>
Following measuring value can be read out by converting input

into PT•CT primary side input.

• Integrated power

• Optional integrated power (present value)

• Optional integrated power (last value)

• Instantanous power

• Voltage r.m.s. value

• Current r.m.s. value

• Instantanous power factor or Current 2 r.m.s. value

• Voltage maximum value

• Valtage minimum value

• Current maximum value

• Current 2 maximum value
Also, start•stop of optional integrated power and reset of

maximum and minimum values of voltage r.m.s.

value and maximum value of current r.m.s. value

can be done through communication.

<RS-485 Communication>
Function: Various measuring values can be read out through

personal computer by command/ response mode.

Readout of measuring value would be made

individually or in block.
Also, control of optional integration and initialization of

maxium and mimimum values can be done

through persomal computer.

System Configuration:

Application Software

RS-232C Port

RS-232C/485 Conveter

RS-485

Personal
Computer

Power
Monitor

Power
Monitor

Power
Monitor

Power
Monitor

Power
Monitor

Terminating

Note: RS-232C/485 Converter is recommended to use our

ML1 in AUTO mode.

Communication specs.: RS-485 Interface
Transmit distance: Maximum about 1.2km

(When use of 24AWG twist pair cable)

12

IM 77C01C01-01E 1st Edition : March 5.2001-00

Connectiong mode:

(1) RS-485 standard Multi-drop connection
Maximum 32 stations (including upper personal
computer)
(2) Terminating resistor: 120Ω
(ON by terminal short)
(3) Not insulated with inner circuit

Connecting Terminal: 3 terminals back face

A: Balanced type twist pair cable –
B: Balanced type twist pair cable +

C: Shield
Transmit mode: Half duplex communication
Synchronizing mode: Start-stop synchronization
Transmit speed: Can be set through parameter setting screen

Setting Range

9600 / 4800 / 2100 / 1200

Data format: Start bit 1 bit

Data bit 8 bits

Parity None

Stop bit 1 bit
Error detect: SUM CHECK (simply adding 2 bytes)
Xon/Xoff Control: None
Terminating character designation: Yes (CR)
Station number setting: Can be set through parameter setting

screen

Setting range

1 to 31

Communication error disposal: If data received is other than

command, reading is ignored and no disposal be

made. (noise or erroneous data would be

ingnored).

Make time-out disposal through upper computer.

Set time-out time more than 1 second.

<LON Communication>
Function: Measuring data can be simply read out on personal

computer through LON communication adapter

and DDE: server without consciousness of

communication. Also, control of optional

integration and initaialization of maximum and

minimum values can be done through personal

computer. Please contact us as to connection with

other instruments.

System Configuration:

Application Softwaer

DDE Server

Data Base

LON Communication

Adapter

LON

Personal
Computer

Power
Monitor

Power
Monitor

Power
Monitor

Power
Monitor

Power
Monitor

● Shape & Mounting

External dimension: 110 x 110 x111mm (HxWxD)
Mounting method: Panel mouting

(Refer panel cut dimension)
Material:
Case: uninflammable ABS plastic (black)
Terminal board: uninflammable ABS plastic (black)
Weight: Abt 500g
Connecting method: M3 screw terminal connection (output,

communication, optional integrated control signal)

M4 screw terminal connection (input, power

supply)

● Accessories:

Label...2, Nut M5...2, Washer M5...2 Spring

washer M5...2 Short bar...1