YOKOGAWA Power Series Plus IM 2493WVP-1 User manual

Users Power SeriesPlus
Manual
Power SeriesPlus
Watt / VAR / Power Factor
Digital Switchboard Meter
IM 2493WVP-1
IM 2493WVP-1
Revision 1, October 1999

CONTENTS
TABLE OF CONTENTS
IM 2493WVP-1
1ST edition, October 1999
All Rights Reserved, Copyright 1999, Yokogawa Corporation of America 0
General Description .................................................................................................1
Specifications...........................................................................................................3
Configuration............................................................................................................5
Configuring the 2493 POWER SERIES Plus Meter............................................5
Keymap .....................................................................................................................7
Changing Settings....................................................................................................8
Changing the potential transformer (pt) ratio setting........................................9
Changing the current transformer (ct) ratio setting ........................................10
Changing the rolling average setting .............................................................11
Changing the network address setting...........................................................12
Changing the baud rate setting......................................................................12
Analog Output Scaling...................................................................................13
Changing the Analog Output Settings............................................................14
Connection Diagrams ............................................................................................19
Mounting and Outline.....................................................................................22

1. GENERAL DESCRIPTION
1. GENERAL DESCRIPTION
IM 2493WVP-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 the
display or 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 2493WVP-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 2493WVP-1 3
PRODUCT FUNCTION: AC Watts/VARs/Power Factor
1 phase-2 wire, 1 phase-3 wire, 3
phase-3 wire,
3 phase-4 wire-2½ elements or 3 phase-
4 wire-3 elements
ACCURACY: Watts & VARs : ±0.2% of Reading
±0.1% of Full Scale
Power Factor: ±0.05
DISPLAY UPDATE RATE: Watts: 80 milliseconds
VARs and Power Factor: 160
milliseconds
OPERATING TEMPERATURE
RANGE: -20 to +60 °Celsius
STORAGE TEMPERATURE
RANGE: -40 to +85 °Celsius
INPUT RANGES: 0-120 VAC or 0-240 VAC
(any combination of Volts & Amps) 0-1 Amp AC or 0-5 Amps AC
0.05 Lead to Unity to 0.05 Lag Power
Factor
TRANSFORMER RATIO RANGES:
Potential Transformer: 1:1 through 1250:1
Current Transformer: 1:1 through 5000:1
Combined (PT*CT):1:1 through
357910:1
ANALOG OUTPUTS (Optional): 0 – 1, ±1 mADC ±10 VDC
compliance into 10 kΩ
4 – 20 mADC
15 VDC compliance into 750 Ω
Note: Analog Output is proportional to
total or WAHS VARS in all phases being
metered.
ANALOG OUTPUT
RESPONSE TIME: within ±1% of final value within 1.0 sec

2. SPECIFICATIONS
IM 2493WVP-1 4
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 2493WVP-1 5
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,
when
viewing or
changing
settings,
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 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

3. CONFIGURATION
IM 2493WVP-1 6
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 2493WVP-1 7
This flowchart illustrates the operation of the POWER SERIES Plus meter using
the push-keys on the front panel.
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 8).
Mode – Next – Not applicable to WAH/VAR/PF units.
Mode – Max – Displays Max Readings.
Mode – Min – Displays Min Readings.

5. CHANGING SETTINGS
5. CHANGING SETTINGS
IM 2493WVP-1
8
Note: This flowchart gives
information pertaining to
units equipped with YCA
communications or no
communications option. The
setup flow is slightly
different for units with
MODBUS communications.
See the Power Series
communications manual (IM
249x-COMM) for details.

5. CHANGING SETTINGS
IM 2493WVP-1 9
Changing the Potential Transformer (pt) ratio setting
When you reach the PT setting, the primary value will be displayed in the middle
row and the secondary value will be 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 0-240V).
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
Current Transformer 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
Primary and Secondary must be between 1.000 and 1250. If the CT is also set,

5. CHANGING SETTINGS
IM 2493WVP-1 10
the combined ratio of CT * PT cannot exceed 357910. This is the mathematical
limit to the software. 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 Current Transformer (ct) ratio setting
When you reach the CT setting, the primary value will be displayed in the middle
row and the secondary value will be shown 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.

5. CHANGING SETTINGS
IM 2493WVP-1 11
If you have a 5 Amp unit, 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 5.
If you have a 1 Amp unit, or you have set the secondary on a 5 Amp unit,
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 CT settings.
The CT primary value can be set to any value between 1.000 and 25000 (5
Amps X 5000 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
Primary and Secondary must be between 1.000 and 5000. If the PT is also set,
the combined ratio of CT * PT cannot exceed 357910. This is the mathematical
limit to the software. 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 CT to a ratio of 5.367
to 5 results in a value of 1.0734. The unit will round this to 1.073, and in the
future display the ratio as 5.365 to 5. Setting the secondary to 1 will always
avoid this.
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.

5. CHANGING SETTINGS
IM 2493WVP-1 12
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 - Please make sure
that no two units have the same address. After saving the value you will move to
the Baud Rate setting.
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.

5. CHANGING SETTINGS
IM 2493WVP-1 13
Analog Output Scaling
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 top display (Watts).
Output 2 is always proportional to the middle display (VARs), and Output 3 will
always be proportional to the bottom display (Power Factor).
A 1phase/2wire/120Volt/5Amp wattmeter with 0 to 1 milliamp output, for
example, has the following default settings:
PT ratio: 1 to 1
CT ratio: 1 to 1
Analog Output LO: 0 Watts
Analog Output HI: 500 Watts
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.
When the settings are changed to:
PT ratio: 1 to 1
CT ratio: 1 to 1
LO: 50 Watts
HI: 450 Watts
The new relationship of input and output is
shown at right.
Next the PT ratio is changed to 2 to 1 (2:1).
Note that the HI and LO for input
automatically change to match the new ratio
whenever the PT ratio or CT ratio is changed.
The HI and LO for Power Factor are not
affected by PT and CT.
So now the settings are -
PT ratio: 2 to 1
CT ratio: 1 to 1
LO: 100 Watts
HI: 900 Watts
And the relationship is shown at right.
Special note for units with 0-1 mA/ ±1 mA
output:
0
100
200
300
400
500
0 0.25 0.5 0.75 1
DC Current Out (mA)
0
100
200
300
400
500
0 0.25 0.5 0.75 1
DC Current Out (mA)
0
200
400
600
800
1000
0 0.25 0.5 0.75 1
DC Current Out (mA)

5. CHANGING SETTINGS
IM 2493WVP-1 14
A unit with 1mA output can be configured by the user to range from 0 to 1 mA or
from –1 to 1 mA. This setting is referred to as CEN (short for ‘center’) on the
front panel display. If the unit is set to 0-1 mA it is guaranteed never to have an
output below 0 mA, regardless of the input. If the unit is set to be a –1 to 1 mA
unit then the output will be negative DC current whenever the input falls below
the LO setting. If the unit is set to be a –1 to 1 mA unit, the LO value then
indicates the midpoint of the range, not the lowest point. Another way to phrase
it would be - the LO value always indicates where the output will be 0 mA.
For example:
A 1 phase 2 wire 120Volt 5 Amp wattmeter has a LO setting of 100 watts and a
HI setting of 400 watts. If it is set to be a 0-1 mA unit, then at 100 watts or less
the output will be 0 mA. If it is configured to be a ±1mA unit and still has a LO
setting of 100 watts, then at 100 watts the output will be 0 mA, but at 70 watts the
output will be –0.1 mA and at –200 watts the output is –1.0 mA.
In this same example, while set as a ±1 mA unit, the LO could not be set any
lower than –250, because the span between HI and LO cannot extend lower than
the Minimum LO, which in this case is -900. (See tables below for a complete list
of limits) That is:
LO – (HI – LO) must not go below the LO limit È-250 – (400 – -250) = -900.
For 4-20 mA units there is no CEN option for changing the range of the output.
Changing the Analog Output Settings
When you reach the ‘out1’ (Watts) display, press Set and the value of CEN1 will
be displayed if the unit has 0-1 mA output. A 4-20 mA unit will display the value
of HI1. If you have a 4-20 mA unit disregard the instructions for CEN1.
For 0-1 mA units - Pressing Set again will cause the center display to begin
blinking. Pressing Inc will switch the setting from “0-1” (0-1mA) to “–1-1” (±1mA)
and back again. Press Set to save the displayed value and move you to the HI
setting.

5. CHANGING SETTINGS
IM 2493WVP-1 15
Changing the HI value is done in the same manner as changing the primary for
PT or CT. First the digits, then the decimal point, then the multipliers
(Kilo/Mega), and finally confirm the new setting.
After pressing Set to confirm the new setting, the LO1 value will be displayed.
To enable you to set either a negative or positive value for LO1 there is a “sign
dash”. If the bottom segment is displayed it means the value is positive. The
middle segment means the value is negative. The sign dash is changed with the
Inc button, just like the other parts of the value. The value still has four digits of
precision, but now one of them is “hidden”. When the third digit is blinking, press
Next and the digits will shift left revealing the fourth digit. Now the sign dash is
hidden and the fourth digit is blinking. Another press of Next will make the digits
shift back right and the sign dash will be visible and blinking.
This shift will also occur when setting the decimal point. When the decimal point
is with the first, second or third digit the fourth digit will not be visible. When the
decimal point is with the fourth digit the sign dash will not be visible.
The rest of the procedure for changing LO1 is identical to the procedure for HI1.
After reaching the confirm mode of LO1, pressing Set will save all values for
Out1 and move you to Out2. None of your changes will be saved until you reach
this point. If you only wish to change the HI value, you still must go through the
LO steps to save your changes.
OUT2: The only difference between Out1 (watts) and Out2 (VARs) is that there
is no sign dash for LO2. Instead, after setting the multiplier for HI2 or LO2, the
Lead/Lag lights on the bottom display will start blinking. Both the HI2 and LO2
values can be set as either Lead or Lag. All other steps are the same as Out1.

5. CHANGING SETTINGS
IM 2493WVP-1 16
OUT3: There is no multiplier for Out3 (Power Factor). The first digit only toggles
between ‘0’ and ‘1’. The decimal point cannot be changed.
Note that the output settings have a precision of four (4) digits only. When the
PT or CT ratio is large, this will result in rounding if you try to set a value too
precisely. For example: If a 1phase/2wire/120V/5A meter has a PT ratio of
1000:1, then the output settings for watts and VARs must be in units of 100,
because you are now dealing with a range of values from
–900,000 to 900,000. 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.

5. CHANGING SETTINGS
IM 2493WVP-1 17
The following values apply to the POWER SERIESPlus Watt-VAR-PF meters:
For Output 1 (Watts):DefaultsInput LO1 HI1 LO1
Minimum HI1 Maximum Span Minimum
2Wire 120V 1A 0.0 100.0 -180.0 180.0 50.00
2Wire 240V 1A 0.0 200.0 -360.0 360.0 100.0
2Wire 120V 5A 0.0 500.0 -900.0 900.0 250.0
2Wire 240V 5A 0.0 1000 -1800 1800 500.0
3Wire 120V 1A 0.0 200.0 -360.0 360.0 100.0
3Wire 240V 1A 0.0 400.0 -720.0 720.0 200.0
3Wire 120V 5A 0.0 1000 -1800 1800 500.0
3Wire 240V 5A 0.0 2000 -3600 3600 1000
4Wire 120V 1A 0.0 300.0 -540.0 540.0 150.0
4Wire 240V 1A 0.0 600.0 -1080 1080 300.0
4Wire 120V 5A 0.0 1500 -2700 2700 750.0
4Wire 240V 5A 0.0 3000 -5400 5400 1500
For Output 2 (VARs): DefaultsInput LO2 HI2 Range Limits Span
Minimum
2Wire 120V 1A 100.0
lag 100.0 lead 180.0 lag – 0 – 180.0 lead 50.00
2Wire 240V 1A 200.0
lag 200.0 lead 360.0 lag – 0 - 360.0 lead 100.0
2Wire 120V 5A 500.0
lag 500.0 lead 900.0 lag – 0 - 900.0 lead 250.0
2Wire 240V 5A 1000 lag 1000 lead 1800 lag – 0 – 1800
lead 500.0
3Wire 120V 1A 200.0
lag 200.0 lead 360.0 lag – 0 - 360.0 lead 100.0
3Wire 240V 1A 400.0
lag 400.0 lead 720.0 lag – 0 - 720.0 lead 200.0
3Wire 120V 5A 1000 lag 1000 lead 1800 lag – 0 – 1800
lead 500.0
3Wire 240V 5A 2000 lag 2000 lead 3600 lag – 0 – 3600
lead 1000
4Wire 120V 1A 300.0
lag 300.0 lead 540.0 lag – 0 - 540.0 lead 150.0
4Wire 240V 1A 600.0
lag 600.0 lead 1080 lag – 0 – 1080 lead 300.0
4Wire 120V 5A 1500 lag 1500 lead 2700 lag – 0 – 2700
lead 750.0
4Wire 240V 5A 3000 lag 3000 lead 5400 lag – 0 – 5400
lead 1500

5. CHANGING SETTINGS
IM 2493WVP-1 18
For Output 3 (Power Factor):
DefaultsInput LO3 HI3 Range Limits Span
Minimum
All 0-1 mA units 1.000 0.000
Lead 0.000 Lag – 1 – 0.000 Lead 0.250
All 4-20 mA
units 0.000 Lag 0.000 Lead 0.000 Lag – 1 – 0.000 Lead 0.250
The above values are without any scaling by the PT ratio or CT ratio. If the PT
ratio is greater than 1 to 1, than the output setting values for watts and VARs
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. Likewise, a
change in the CT ratio will proportionally change the values in the chart above.
Power Factor is not affected by the transformer ratios.
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 2 Wire 120V 1A wattmeter, you could set the LO to 0 and the HI to 50.
Or you could set the LO to 110 and the HI to 160. But you could not set the LO
to 60 and the high to 90. 90 minus 60 is less than 50.
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 or if the span is too big
(goes out of range) 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 1.06mA. For a 4-20mA unit that
limit is 20.96mA. Likewise, if the input drops below the LO setting, the lower end
of the output is limited to 3.04mA for a 4-20mA unit and –1.06mA for a ±1mA
unit. A 0-1mA unit can never go below 0mA.