YOKOGAWA PR720 User manual

User’s
Manual
Yokogawa Electric Corporation
IM 77C01E31-01EN
1st Edition
Model PR720
Power and Energy Meter
User’s Manual

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1
IM 77C01E31-01EN
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Introduction
Thank you for your purchase of our product.
Read this instruction manual carefully before installation, wiring, and using this product.
Keep this instruction manual handy for reference at any time.
Have a contact with us or sales agent in case that this instruction manual is lost or damaged.
<Caution>
Have a contact with us when you have any questions or are aware of missing article.
Safety precaution
Important contents are mentioned in this instruction manual to prevent any damage / use this product appropriately.
Keep the following safety precaution in mind after understanding each sign.
Improper use may lead to death or severe injury.
Improper use may possibly lead to death or severe injury.
Improper use may lead to medium injury.
We are not responsible for the damage caused by following condition (earthquake / fire which is not caused by us, action by
third party, other accident, damage caused by our customer, misuse, product usage under abnormal condition).
We are not responsible for secondary damage caused by product use / product malfunction(loss of profit, halt of business
operation). We are also not responsible for damage caused by false operation in combination with connecting equipment
which is beyond our control.
Do not disassemble, remodel and repair this product.
Have a contact with us or sales agent when product failure happens to prevent fire / electric shock / injury.
Do not get this product wet to prevent heat generation / ignition / product failure. When this product gets wet, stop using it.
Do not connect metal excepting wiring to terminal in order to prevent heat generation/ignition.
Do not get this product near the inflammables / combustible chemicals / gas to prevent fire.
Connect specified power supply.
Connecting power supply beyond specification causes fire / product failure.
When dust is on the terminal, wipe it off after power is OFF to prevent fire.
Follow the below-mentioned procedure when abnormality (fuming / bad odor) happens.
(1) Stop a power supply and input, and stop using.
(2) Contact our company or a distributing agent.
Do not use this product in a environment of high temperature / high humidity to prevent any damage.
Do not touch the terminal during operation to prevent electric shock.
Do not pull/bend connecting cable with force. Cable damage causes heat generation / burn and contact failure leads to
equipment damage.
Do not connect/inspect with wet hands to prevent electric shock.

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Other precaution
Don't mount or store this unit in the following environment.
Places where corrosive gas (SO
2 / H 2 S / etc.)(１) is generated.
Places where dust is generated.
Places with much vibration and shock.
Places with influence of external magnetic field (２).
Note (１) Corrosive gas = Sulfur dioxide SO 2 / Hydrogen sulfide H 2 S / etc.
Note (２) Large current bus / saturable reactor / etc.
Wipe off dirt on the surface with dry cloth softly. Keep in mind that strong rubbing of nameplate leads to character
disappearance. Organic solvent and chemicals and cleaner is not appropriate for cleaning.
Mercury component, Nickel-cadmium battery are not used in this product.
Please dispose of this product as industrial waste (noncombustible).
The precautions at the case of using by outdoor board.
This product is not dust-proof structure and not waterproof structure. In using by the outdoor panel, please avoid the
place, which dust causes. And, please install in the place that requires neither rain nor waterdrop.
Please do not install in the place of sunlight. A display of this product may become hard to see.
And, deformation of a case may take place by the surface temperature rise.
The warranty period and warranty scope.
Warranty period.
The warranty period of this product is for one year after supplying the appointed place.
Warranty scope.
In the state of the normal use of product-specification within the range according to this instruction manual,
the trouble within the warranty period performs exchange or repair gratuitously.
However, the shipping expenses and the packing cost in the case of shipping obtain as payment on a customer.
And, if it corresponds to the next, it does not warrant.
(1) If it breaks down when converted or repaired except our company.
(2) If it breaks down by use out of specification range.
(3) If the cause of trouble is based on cause other than this product.
(4) Transportation, movement, damage by falling, and trouble.
(5) A natural disaster, disaster, etc., if it is the trouble which is irresponsible for a payment side
(our company or distributing agent).
This warranty is a warranty of a product simplex. It cannot warrant the damage induced by trouble of this product.
Change of instruction manual written contents.
This instruction manual changes written contents without a notice by product improvement etc.

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The precaution for use
1. Environment of usage and storage.
Don’t mount or store this product in the following environments. If the unit becomes defective due to the use in an
environment other than specified, it may be repaired for pay even during its warranty period (one year after the date of
delivery).
Don’t mount or store the unit at a place where the ambient temperature is other than a range of -10 to +55°C or
the relative humidity is higher than 85
% RH.
Don’t mount or store the unit at a place where a corrosive gas such as SO
2 , H 2 S, etc. is generated.
Corrosive gas = Sulfur dioxide SO
2 / Hydrogen sulfide H 2 S / etc.
Large current bus / saturable reactor / etc.
Don’t mount or store the unit at a dusty place.
Don’t mount or store the unit at a place subjected to noticeable vibrations or shocks.
Don’t mount or store the unit at a place subjected to noticeable external noises.
If this unit directly measures an inverter output of cycle control, SCR phase angle control or PWM control, an error may
increase due to its operation principle.
2. Cautions on use in an outdoor panel
Be careful with the following items when using this unit in an outdoor panel.
Don’t mount the unit at a place where it is directly exposed to rain or water drops, otherwise this unit may become
defective because of no water-proof or drip-proof structure.
Don’t mount the unit at a dusty place.
Don’t mount the unit at a place exposed to direct sunlight. Avoid exposing the unit to direct sunlight even through a glass
window.
If the meter is directly exposed to sunlight, the surface temperature of the meter rises and the case may be deformed if
the temperature exceeds 80°C.
If the average temperature around the meter exceeds 40°C, the life of the unit may shorten.
3. About dew condensation
If the temperature and humidity of an installation change rapidly when a product is a non-energization, the waterdrop by dew
condensation may adhere to a display inner side. (The display filter and the LCD surface stick and the pattern of the shape
of a circle or an ellipse occur.) This phenomenon improves by doing the power distribution of the auxiliary power and leaving
it for about 2 hours.
4. Mounting and wiring
Mount and connect the unit by a technician while referring to the instruction manual and observing the following cautions.
Connect the unit after confirming the connection diagram. An improper connection may cause troubles such
as the generation of a high voltage on the secondary side of its current transformer or burning of the unit or
the occurrence of a fire.
Don’t perform any connection in a hot line without turning off the power supply in advance, otherwise an
electric shock accident, troubles or burning of the unit, a fire, gas explosion, or other very dangerous
accidents may occur.
The terminal cover is mounted for preventing an electric shock accident. Mount the terminal cover without fail
after the end of work.

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5. Setting
This unit requires setting and confirmation of the measuring range, etc. before use. Wrong setting, if any, causes malfunction
of the unit. If setting should be wrong, neither measurement nor output becomes correct.
Carefully read the instruction manual before setting the unit.
■Default setting
The default settings are as specified below at the delivery time. Set them according to the working conditions.
The input circuit of this product is the common use of 3-phase 3-wire (3φ3W), single-phase 2-wire (1φ2W), and single-phase
3-wire (1φ3W). In case an input circuit is designated at the case of an order, it is shipped by the default value of the
designated input circuit. And, in case it does not do designation of the input circuit (with no designation), it is shipped by the
default value of 3-phase 3-wire (110V).
The unit will be delivered with your specified setting values, if so specified.
№Setting item
3-phase 3-wire
Single-phase 3-wire
(U-W-N)
Single-phase
110V input
220V input
110V input
220V input
1 Display
combination
Pattern
Pattern 1
Pattern 1
Pattern 1
Main monitor
A(V)
A(U)
A
Sub monitor (Left)
V(UV)
V(UN)
V
Sub monitor (Center)
W
W
W
Sub monitor (Right)
Wh
Wh
Wh
Bar graph
A(V)
A(U)
A
2Alarm output
Factor
DA
DA
DA
Reset form
AUTO
AUTO
AUTO
Contact delay time
0 second
0 second
0 second
3Demand
detection
Demand
current
Upper limit <H>
80.0A
400.0A
40.00A
Interval
0 second
0 second
0 second
Demand
power
Upper limit <H>
OFF
OFF
OFF
Interval
0 second
0 second
0 second
Operation form
Operating system
according with
bimetallic type.
Operating system
according with
bimetallic type.
Operating system
according with
bimetallic type.
4
Instant
measurement
detection
Voltage upper limit OFF OFF OFF
Voltage lower limit OFF OFF OFF
5 Backlight
Action
AUTO
AUTO
AUTO
Brightness
3(Middle)
3(Middle)
3(Middle)
6
Measurement
range
Voltage range
6600V
220.0V
110.0V
3300V
220.0V
Digit number of voltage range
4 digits
4 digits
4 digits
4 digits
4 digits
Current range
100.0A
500.0A
50.00A
Current display intrinsic
sensitivity
100.0A 500.0A 50.00A
Digit number of current range
4 digits
4 digits
4 digits
Active power polarity
One-way deflection
One-way deflection
One-way deflection
Active power range
1200kW
( /1kW)
40.00kW
( /2kW)
100.0kW ( /1kW)
150.0kW
( /500W)
10.00kW
( /1kW)
Digit number of active power
range
4 digits 4 digits 4 digits 4 digits 4 digits
Reactive power range
600.0kvar
( /500var)
20.00kvar
( /1kvar)
50.00kvar ( /500var)
75.00kvar
( /250var)
5000var
( /500var)
Digit number of reactive
power range
4 digits 4 digits 4 digits 4 digits 4 digits
Power-factor range
LEAD0.5 to 1 to LAG0.5
LEAD0.5 to 1 to LAG0.5
LEAD0.5 to 1 to LAG0.5
Frequency range
45.0 to 65.0Hz
45.0 to 65.0Hz
45.0 to 65.0Hz
Digit number of frequency
range
3 digits 3 digits 3 digits

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№Setting item
3-phase 3-wire
Single-phase 3-wire
(U-W-N)
Single-phase
110V input
220V input
110V input
220V input
7
Communication
output
Address
1
1
1
Transmission rate
9600bps
9600bps
9600bps
Parity
Even number
Even number
Even number
Stop bit
1 bit
1 bit
1 bit
8 Pulse output
Factor
Wh
Wh
Wh
Pulse unit
10kWh/pulse
0.1kWh/pulse
1kWh/pulse
1kWh/pulse
0.1kWh/pulse
9
External operation input
Alarm reset
Alarm reset
Alarm reset
10
Measurement
display
ON/OFF
Voltage
ON
ON
ON
Current
ON
ON
ON
Demand current
ON
ON
ON
Active power
ON
ON
ON
Demand power
ON
ON
ON
Reactive power
ON
ON
ON
Power-factor
ON
ON
ON
Frequency
ON
ON
ON
Watt-hour of power receiving
ON
ON
ON
Watt-hour of power
transmission
ON ON ON
var-hour of power receiving
ON
ON
ON
var-hour of power transmission ON ON ON
11 Input circuit
Phase line change (3)
3φ3W
1φ3W(U-W-N)
1φ2W
Input voltage (4)
110V
220V
300V
110V
220V
12
Measurement
Tidal current measurement
General measurement
General measurement
General measurement
Note(3) If input circuit phase wire change setting is changed, it will return to the default setting of the phase wire which the
value (No.1 to 10 of a table) of setting 1 and setting 2 changed.
Note(4) When phase line change setting of an input circuit is set as 3φ3W (or 1φ2W) and the input voltage setting is
changed, the voltage range returns to the default value of the phase line.
(For example: In case of 3φ3W, 6600V at the case of 110V setting, 220.0V at the case of 220V setting.）

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6. Operation
Be careful with the following cautions during use.
Use the input within the rated range. Be careful since negligence of this caution may cause troubles of the unit.
There is a function to hold the maximum value and the minimum value with a measurement factor in this product.
A blackout is guaranteed and this value isn't also cleared by a power supply reset. However, the minimum value may be
updated in case input is not applied to a power up. For this reason, in order to make the past minimum value hold by
powering on, please apply input within 1 second after switching on a power supply.
The maximum value, a minimum value measurement factor
Measurement factor
Maximum value
measurement
Minimum value
measurement
Voltage, Current, Demand current, Active power, Demand power,
Reactive power, Power factor, Frequency
✓✓

Be careful not to touch any terminal when power is applied to the unit.
Don’t disassemble or modify this unit without any previous permission of our company, otherwise the
warranty does not apply to the unit any more. Also, modifications may cause troubles, a fire, or other
accidents. For specifications change, etc., please contact us.
7. Maintenance and check
Wipe off the surface of the unit with a dry soft cloth. The liquid crystal display (LCD) may light during cleaning on the
LCD face. However, this phenomenon is caused by the static electricity that may be produced in the filter, and it does
not show any trouble. Leave the unit as it is for a while, and the display goes out due to natural discharge. Please keep
in mind that it will break if a LCD is pushed strongly.
And, if a filter is pushed, a LCD face will touch a filter. Therefore, the pattern of the shape of a circle or an ellipse may
occur. Please do not push a filter strongly.
Check the following items.
◎Check the unit for damage in appearance.
◎Check if indications conform to the inputs.
◎Check if the unit is mounted normally without any loose connections of the terminal board after turning off the power
supply.
If a question has arisen or if the unit seems to be defective, please contact us.
■Phase and wire system
The phase and wire system described in this manual are as follows.
1φ2W: Single-phase two-wire systems
1φ3W: Single-phase three-wire systems
3φ3W: Three-phase three-wire systems