YOKOGAWA Power Series Plus IM 2493VVV-1 User manual

Users Power SeriesPlus
Manual
Power SeriesPlus
3 in 1 AC Voltage
Digital Switchboard Meter
IM 2493VVV-1
IM 2493VVV-1
Revision 1, October 1999

CONTENTS
TABLE OF CONTENTS
IM 2493VVV-1
1ST edition, October 1999
All Rights Reserved, Copyright 1999, Yokogawa Corporation of America 0
General Description .................................................................................................1
Specifications...........................................................................................................3
Configuration............................................................................................................4
Configuring the 2493 POWER SERIES Plus Meter............................................4
Keymap .....................................................................................................................6
Changing Settings....................................................................................................8
Changing the potential transformer (pt) ratio setting........................................8
Changing the rolling average setting ...............................................................9
Changing the network address setting.............................................................9
Changing the baud rate setting......................................................................10
Analog Output Scaling...................................................................................10
Changing the Analog Output Settings............................................................11
Connection Diagrams ............................................................................................14
Mounting and Outline.....................................................................................15

1. GENERAL DESCRIPTION
1. GENERAL DESCRIPTION
IM 2493VVV-1 1
The Yokogawa Corporation of America POWER SERIES Plus digital
switchboard meters incorporate the latest DSP ASIC technology. The ASIC
circuitry, developed by Yokogawa, has created a family of user-friendly, field-
adjustable meters.
When ordering the 2493 meter, the following options are available:
•AC Measuring Function(s): Volts, Amps, Watts, VARs, Power Factor,
and/or Frequency.
•Input Range: 0-150V, 0-300V, 0-1 A, 0-5 A, 40-70 Hz, 300-500 Hz
•Wiring Configuration: 1P2W, 1P3W, 3P3W, 3P4W, 3P4W 2 ½ element
•Analog Output Type: 0 to 1mADC, 4 to 20 mADC, or none
•Power Supply: 120 VAC, 240 VAC, 24 VDC, 48 VDC or 125 VDC
•Communications: MODBUS comm., YCA-485 comm. or no comm.
The meter display and output scaling are completely field-adjustable from the
front panel. The meter does not need to be re-calibrated after adjusting display
and output scaling. There are no internal parts that the user needs to service or
adjust. When a POWER SERIES
Plus
meter leaves the factory it will be calibrated
to meet or exceed its published specifications.
SAFETY NOTE: There are no field-serviceable parts in the unit. If the unit
is disassembled for any reason both Auxiliary Power and input voltages
and currents must be de-energized.
Limited Warranty
This meter has been delivered to you after strict quality control and inspection.
Yokogawa Corporation of America warrants its Equipment to meet applicable
specifications, if any, and to be free from defects in material and workmanship for
a period of one (1) year from date of shipment to the original Purchaser. Upon
receipt of prompt notice from Purchaser, referencing the order number and
detailing the claimed non-conformity or defect, Seller shall, at its option, repair or
replace the Equipment. Equipment returned to Seller will only be accepted with a
Returned Material Authorization (RMA) number issued by Seller or one of its
authorized representatives. Inbound shipping charges to Seller’s factory in
Newnan, Georgia, or other designated facility, are the responsibility of Purchaser.
Normal shipping charges for the return to Purchaser of repaired or replacement
Equipment shall be the responsibility of the Seller (North American points only).
Repair or replacement of the Equipment in the manner described above is the
exclusive warranty remedy and shall constitute complete fulfillment of all Seller’s
liabilities for breach of this warranty. The Seller assumes no responsibility
hereunder for any equipment damage or failure caused by improper installation,

1. GENERAL DESCRIPTION
IM 2493VVV-1 2
operation and maintenance of the Equipment, or normal wear and tear on
disposable or consumable parts. This warranty shall be void in the event of
unauthorized modification or servicing of the Equipment.
The foregoing warranty is exclusive and in lieu of any other warranties of
quality, whether expressed or implied (including any warranty of
merchantability or fitness for a particular purpose). In no event shall Seller
be liable hereunder for any special, indirect, incidental or consequential damages
including the loss of revenue or production.

2. SPECIFICATIONS
2. SPECIFICATIONS
IM 2493VVV-1 3
3 in 1 AC Voltage Specifications
PRODUCT FUNCTION: AC Volts, 3 Phases, 3 Wires or 4
Wires
ACCURACY: ±0.2% of Reading ±0.1% of Full Scale
DISPLAY UPDATE RATE: Channel A – 80 milliseconds
Channel B & C – 160 milliseconds
OPERATING TEMPERATURE RANGE: -20 to +60 °Celsius
STORAGE TEMPERATURE RANGE: -40 to +85 °Celsius
INPUT RANGES: 0-150 VAC or 0-300 VAC (3P4W)
0-150 VAC or 0-240 VAC (3P3W)
POTENTIAL TRANSFORMER
RATIO RANGE: 1:1 through 1250:1
ANALOG OUTPUTS (Optional): 0 – 1 mADC, 10 VDC compliance into
10 kΩ
4 – 20 mADC, 15 VDC compliance
into 750 Ω
ANALOG OUTPUT RESPONSE TIME: Within ±1% of final value within 1
second
ISOLATION:
Input/Output and Case: 2500 VAC
Output to Aux. Power: 2000 VAC or 500 VDC for DC-
powered options
Aux. Power to Case: 2000 VAC or 500 VDC for DC-
powered options
Output to Case: 1000 VAC

3. CONFIGURATION
3. CONFIGURATION
IM 2493VVV-1 4
CONFIGURING THE 2493 POWER SERIES Plus METER
The new triple-display POWER SERIES Plus can be configured for voltage and
current inputs from instrument transformers, as well as analog outputs, RS-485
network address and a rolling average display.
All set-up functions can be performed using the four push-buttons on the front
panel (see below) or via RS-485 communications. You can also use the buttons
to display the minimum and maximum readings and to change the display from
phase to phase.
This button
starts all
operations.
When
viewing or
changing
settings it is
used to
back out of
a mode.
This button
can change
the phase
being
displayed,
or, when
viewing or
changing
settings, it
moves
between
settings or
between
digits.
This button
will
increment
the value
being
changed.
It is also
used to
display Max
readings.
This button,
when
viewing or
changing
settings, is
used to
select a
mode, save
it, and then
move to the
next mode
in the
sequence.
It is also
used to
display Min
readings.
All button operations are begun with the Mode button.
To see the Min or Max, push the Mode button and then the button of the reading
you want to see – Min or Max. The values will display for ten (10) seconds
before reverting to the normal display. If you want to reset the values, push the
Min or Max button again before the 10 seconds has expired.
To change between phases, press the Mode button first, and then the Next
button. The display will switch between line-to-neutral and line-to-line. A unit
with 3 Phase 3 Wire connection, however, would not display line to neutral
values.

3. CONFIGURATION
IM 2493VVV-1 5
To view the configuration settings, press Mode twice (Mode – Mode) and then
press Set. The first setting – the Primary Transformer (PT) ratio - will be
displayed.. To see the other settings, press Next. You can scroll through all the
settings by pressing Next. To go back to normal operations, press Mode. To
change the setting being shown, press Set. See the specific sections on the
following pages for details on how to change the settings. Once a setting is
changed it will advance to the next setting. At any point while changing settings,
pressing Mode will exit the mode without changing anything.

4. KEYMAP
4. KEYMAP
IM 2493VVV-1 6
This flowchart depicts the front panel key options when operating in normal reading
mode. The options are:
Mode-Mode – Invokes change setting menu (see flow chart page 6).
Mode – Next – Toggle from Line-Line to Line-Neutral display.
Mode – Max – Displays Max Readings.
Mode – Min – Displays Min Readings

5. CHANGING SETTINGS
5. CHANGING SETTINGS
IM 2493VVV-1 7
This flowchart illustrates the operation of changing settings of the POWER SERIES Plus
meter using the push-keys on the front panel.
Note: This flowchart
gives information
pertaining to units
equipped with YCA
communications option,
or no communications
option. The setup flow is
slightly different for units
with MODBUS
communications option.
See the Power Series
communications manual
(IM 249X-COMM) for
details.

5. CHANGING SETTINGS
IM 2493VVV-1 8
Changing the Potential Transformer (pt) ratio setting
When you reach the PT setting, the primary value is displayed in the middle row
and the secondary value is displayed in the bottom row. Press Set and the first
digit of the primary value will begin blinking. You can increment the value of this
digit by pressing Inc. Once a digit has reached 9 (nine) it will then go to 0 (zero).
To move to the next digit press Next. You can return to the first digit by pressing
Next while the last digit is blinking.
When you have the digits as you want them, press Set. The decimal point will
now be blinking. You can then move the decimal point to the right by pressing
Inc. Once it has reached the last position it will jump to the first position on the
next Inc.
Pressing Set again will bring you to the Multiplier (Kilo) setting. In the leftmost
digit you will see a blinking ‘ |- ‘ and if the multiplier light is on it will also blink.
You can change the setting by pressing Inc.
The next time you press Set the value of the secondary will blink. To change the
value, press Inc. There are only two choices: 1 or 120. (1 or 240 if the input
range is 0-300V).
Pressing Set will now move you to the Confirm mode. All values will blink. If the
values are correct press Set one last time to save them and move on to the
Analog Output settings. Pressing Mode at this time or at any other step in the
process will restore the old PT settings.
The PT primary value can be set to any value between 1.000 and 300000 (240
Volts X 1250 ratio). If it is not in this range you get the error “ErrH” (Too High) or
“ErrL” (Too Low) when you try to advance to the secondary. The ratio of the

5. CHANGING SETTINGS
IM 2493VVV-1 9
Primary and Secondary must be between 1.000 and 1250. You will get “ErrH” or
ErrL” if you try to advance to Confirm mode with an incorrect ratio.
If you try to save a ratio value that exceeds the precision of the unit, that value
will be automatically rounded off. For example, setting the PT to a ratio of 12.34k
to 120 results in a value of 102.833333. The unit will round this to 102.8, and in
the future display the ratio as 12.33k to 120. Setting the secondary to 1 will
always avoid this.
Changing the Analog Output (see page 10)
Changing the Rolling Average setting
The rolling average causes the displayed value to be an average of the number
of samples to which this parameter is set. Increasing this setting will reduce digit
bounce, but will slow the display response time. The analog output response
time is not affected by this setting.
When you reach the Average setting, press Set and the first digit will begin
blinking.
To increment the value of the digit, press Inc. Once a digit has reached 9 (nine),
it will then go to 0 (zero). To move to the second digit press Next. To return to
the first digit press Next again. When you have set the desired value, press Set.
Both digits will blink, showing you are now in Confirm mode. If the value is
correct press Set one more time to save the value and move on to the Address
setting. Pressing Mode at any time before this will restore the old setting.
The average can be set to any value from 0 to 29.
Changing the Network Address setting
The Address setting is changed in exactly the same way as the Average setting.
The address can be set to any value from 01 to 32. NOTE – No two units should
have the same address. If they do, neither will communicate properly.
After saving the value you will move to the Baud Rate setting.

5. CHANGING SETTINGS
IM 2493VVV-1 10
Changing the Baud Rate setting
When you reach the setting, press Set and the whole value will begin blinking.
To change it to the next choice, press Inc. You can scroll through all the choices
with the Inc key. Those choices are 9600 (default), 4800, 2400 and 1200. When
you have reached the desired choice, press Set. The new setting will be saved
and the unit will proceed to the next mode.
Analog Output Scaling (If equipped)
The POWER SERIES Plus has the option of analog output, which can provide an
analog signal relative to the input of the meter. The relationship between the
input and the output can be scaled by the user using the front panel. Analog
Output 1 is always proportional to the value shown on the first (top) display.
Output 2 is always proportional to the middle display, and Output 3 will always be
proportional to the bottom display. With 4-wire units, switching the display
between line-to-line and line-to-neutral will result in a corresponding change in
the analog output.
A 150V voltmeter with 0 to 1 milliamp output,
for example, has the following default settings:
PT ratio: 1 to 1
Analog Output LO: 0 Volts
Analog Output HI: 150 Volts
The LO is the input value at which the output
will be 0 mA. The HI is the input value at
which the output will be 1 mA. The charts at
right show the relationship of input and output.
0
30
60
90
120
150
0 0.25 0.5 0.75 1
DC Current Out (mA)

5. CHANGING SETTINGS
IM 2493VVV-1 11
When the settings are changed to:
PT ratio: 1 to 1
LO: 20 Volts
HI: 120 Volts
The new relationship of input and output is shown
at right.
Next the PT ratio is changed to 2 to 1 (2:1).
Note: The HI and LO automatically change to
match the new ratio whenever the PT ratio is
changed. So now the settings are:
PT ratio: 2 to 1
LO: 40 Volts
HI: 240 Volts
And the relationship is shown at right.
Changing the Analog Output Settings
When you reach the ‘out1’ (or ‘out2’ or ‘out3’) display, press Set and the value of
HI will be displayed. Pressing Set again will cause the first digit to begin blinking.
To move to the next digit press Next. Next will move you through all four digits
and back to the first one, if necessary. You can increment the value of the
blinking digit by pressing Inc. Once a digit has reached 9 (nine) it will go to 0
(zero) on the next press of Inc.
0
30
60
90
120
150
0 0.25 0.5 0.75 1
DC Current Out (mA)
0
60
120
180
240
300
0 0.25 0.5 0.75 1
DC Current Out (mA)

5. CHANGING SETTINGS
IM 2493VVV-1 12
When you have set the digits as you want them, press Set. The decimal point
will now be blinking. You can then move the decimal point to the right by
pressing Inc. Once it has reached the last position it will jump to the first position
on the next press of Inc.
Pressing Set again will bring you to the Multiplier (Kilo) setting. In the leftmost
digit you will see a blinking ‘ |- ‘ and if the multiplier light is on it will also blink.
You can change the setting by pressing Inc.
Pressing Set will now move you to the HI Confirm mode. The whole value will
blink. If the value is correct press Set one last time to move on to the LO setting.
Pressing Mode at this time or at any other step in the process will restore the old
HI setting.
Even if you do not want to change the LO setting, you still must go through the
steps in LO to save changes that were made to the HI value. Nothing is stored in
memory until you are in the LO setting Confirm mode and you press Set.
The LO value is changed in the same way as the HI value. First digits, then the
decimal point, then the multiplier, and finally the Confirm mode. In Confirm
mode, with all the digits blinking, a press of the Set button will save all the
changes and move you to the next setting.
Note: The output settings have a precision of four (4) digits only. When the PT
ratio is large, this will result in rounding if you try to set a value too precisely. For
example: If a 150V meter has a PT ratio of 1000:1, then the output settings must
be in units of 100. Trying to set a value to 124 or another value not divisible by
100 will result in the value being rounded to the nearest 100’s.
The following values apply to the Power Series
Plus
Voltmeters:

5. CHANGING SETTINGS
IM 2493VVV-1 13
Model Default
LO Minimum LO Default HI Maximum HI Minimum Span
150 Volts 0.0 0.0 150.0 162.0 45
300 Volts 0.0 0.0 300.0 324.0 90
The above values are without any scaling by the PT ratio. If the PT ratio is
greater than 1 to 1, than the output setting values above must be multiplied by
the PT ratio. For example, if the PT ratio is changed to 3 to 1, then all the values
in the chart above will be multiplied by 3.
You cannot set a value lower than the minimum LO or higher than the maximum
HI.
The span between the LO and HI must not be smaller than the minimum span.
So with a 150V Voltmeter, you could set the LO to 0 and the HI to 45. Or you
could set the LO to 115 and the HI to 160. But you could not set the LO to 50
and the high to 90. 90 minus 50 is less than 45.
If a value is too low you will get the error “ErrL”. If the value is too high you will
see the message “ErrH”. If the span is not big enough the message is “ErrS”.
If the input is greater than the HI setting the output will match it until it reaches
the limit of the unit. For a 0-1mA unit that limit is typically 1.06mA. For a 4-20mA
unit that limit is typically 20.96mA. Likewise, if you set LO to 10 Volts, for
example, and the input dropped below that, the lower end of the output is
typically 3.04mA for a 4-20mA unit. A 0-1mA unit can never go below 0mA.

6. CONNECTION DIAGRAMS
6. CONNECTION DIAGRAMS
IM 2493VVV-1 14
Connection Diagrams
WARNING: All circuits should be de-energized when making connections
to the rear terminal block.

6. CONNECTION DIAGRAMS
IM 2493VVV-1 15
Mounting and Outline