Yokogawa 2491 Specifications

Test&Measurement

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Power Series

Digital Switchboard Meters

tmi.yokogawa.com

Power Series

SWITCHBOARD INSTRUMENTS

ADDITIONAL YOKOGAWA PRODUCTS

PANEL METERS

Yokogawa has the broadest line of panel meters available today. The

New Big Look, Horizon and Stylist series of meters are RoHS compliant.

UL and IP54 splash resistant models are available. Request catalog

250260PB-B for more information.

Digital Switchboard Meters

Other Catalogs Available...

Power Transducers

Yokogawa Juxta Power Transducers (models 2469, 2489) are UL recognized and enclosed in a rugged case with either 0.2% or 0.5% accuracy.

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Panel Meters

Options Available

Yokogawa has the broadest line of panel meters available today. In many cases, our panel meters are completely interchangeable with other manufacturer’s products. UL and IP54 splash resistant models are available.

Switchboard Instruments

SWITCHBOARD INSTRUMENTS

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Yokogawa is the world leader in Analog Switchboard Instruments. Our catalog contains the entire switchboard line including AB/DB 14, 16, 17 and 40, and type 180 edgewise. It also includes the 2180 mini-switchboard meters, potential transformers, transducers and digital switchboard meters.

Power Series

Digital Switchboard Meters

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The POWER SERIES provide our customers with a versatile AC digital power meter. The heart of our POWER SERIES incorporates the latest DSP microprocessor technology. Careful and thoughtful design has resulted in a family of user-friendly, field-adjustable meters. The design of the POWER SERIES switchboard meter with transducer output which can be configured in the field by an end-user, or when installed in new electrical equipment by an OEM. It eliminates requirements for a large inventory of dedicated instruments, and provides flexibility when new panel designs or system upgrades require changes in instrument transformer ratings. Our rugged metal case fits standard panel cutouts for switchboard meters and makes it a perfect replacement for less versatile instruments. The RS-485 communications option allows up to 32 meters to be networked together for remote monitoring and control. In addition, the POWER SERIES locked out for security via the remote communications option.

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digital switchboard meter was developed by Yokogawa Corporation of America to

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combines a high accuracy digital

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can be set up and

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meter

The 2493 triple display multifunction power meter...

Ideally designed for easy retrofit into existing switchboard meter panel cutouts. The 2493 features three easy to read LED displays, minimum/maximum values at the touch of a button, scaling up to 9999. Optional 0-1mA DC and 4-20mA DC analog outputs are configurable by the user and RS485 communications option is available at no additional cost.

Features

• Scaling of the instrument for PT (potential transformer) primary ratings up to 9999; and CT (current transformer) primary ratings up to 9999.

• Adjustable transducer output proportionate to the primary input setting.

• Electrical legends (i.e., Watts, Kilowatts, Megawatts) can be set by the user and indicated by a red LED adjacent to the selected legend.

• Display average setting: Adjustable to obtain a “rolling average” of inputs. Increasing the number of

samples reduces annoying “digit bounce” by the least significant digit.

• All settings are stored in non-volatile memory. If there is a loss of power to the instrument, all settings will remain as they were prior to power loss.

• Accuracy of ±0.2% of reading, ± 0.1% of full scale.

• True RMS current and voltage measuring capability. A most desirable feature when distorted wave forms are present on the line.

• High resolution/ high intensity LED displays that can be viewed from almost any angle.

Power Series

Digital Switchboard Meters

Set-up and Configuration (2491, 2492)

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The POWER SERIES and averaging function. At Yokogawa, we program each model according to the specified options required by the user. This minimizes the number of steps to set up the instrument at the job site or on the factory floor.

Each model is programmed only for the options selected, so there are no unnecessary menu items. If you select a Voltmeter without analog output, then set up will be limited to PT ratios, LED display, and average setting. All can be accomplished in less than one minute. If no transformer is required, the ratio entered for PT P and PT S is 1 (1:1).

Set up functions appear on the display as symbols. They are accessible when you press the MODE pushbutton located behind the front cover and beneath the LED display. After pressing MODE, you are in the setting mode “rSEt” and can begin setting up. Error codes during set up mean your inputs may be incorrect or outside of the range of the instrument. Refer to the instruction manual for range/span restrictions for each model selected.

The pushbutton setting switches are described below. In order for a setting to be entered into memory, you must complete all entries for that mode such as: “PT P” and “PT S” (PT primary and PT secondary). If the values do not need to be changed from a previous setting, simply push the EN switch several times to go to the next mode.

After auxiliary power connection and removal of the cover, the instruction manual will guide you through set up. Pushbutton switches are located directly below the LED display. The POWER SERIES before, or after installation in a panel. Once set up is complete, replace the cover and make the appropriate input connections.

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can be configured for primary and secondary transformer inputs, legends, outputs

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can be set up

PUSHBUTTON SETTING SWITCHES

Mode

Mode switch transfers user

back and forth between standard mode (present

setting) and “rSET” mode.

(under the cover)

This switch moves

from one unit setting

to another, or mode

to mode

This switch moves

digits to selected

values and moves

decimal position.

After each setting,this

switch enters input

data, then proceeds

to next sequence.

Set-up and Configuration (2493)

Power Series

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Digital Switchboard Meters

The new triple display POWER SERIES

and current inputs from instrument transformers, as well as analog outputs and a rolling average.The exact functions depend on the model options selected by the customer. For example: If you selected a 3 in 1 Voltmeter with no analog output, you would only need to set the PT ratio and average. If you are tied into a network with RS485, then you would also need to identify the network address and baud rate.

All set-up functions can be performed using the four buttons on the front panel (see below). You can also use the buttons to display the minimum and maximum readings and, on some models, to change from phase to phase.

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has front panel pushbuttons which can be used for setting voltage

PUSHBUTTON SETTING SWITCHES

(front panel)

Mode Next

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. When viewing or changing settings, it moves between settings or between digits.

Inc

Max

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.

Set

Min

All button operations begin 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 10 seconds before reverting to the normal display. If you want to reset the values, push the Min or Max button again before 10 seconds have passed.

If the model that you select can change between phases, it is done by pressing the Mode button first, and then the Next button. The display will switch to the next phase in the sequence. For example: A Volt-Amp-Hertz meter with 3P4W connections would cycle A-B-C-AB-BC-CA and then back to A. To view the configuration settings, press Mode twice (Mode-Mode) and then press Set. The first setting will be displayed. For a Triple Amp meter this setting will be the Current Transformer (Ct), for all other models this will be the Potential Transformer (Pt). 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 above paragraphs on the specific settings for details. Once a setting is changed it will display the next setting. At any point while changing settings, pressing Mode will exit without changing anything.

Power Series

Digital Switchboard Meters

Model Types and Rated Inputs

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MEASURING CAPABILITY

DC VOLT

AC AMPERES

AC VOLTAGE

FRQUENCY

WATTS

VARS

POWER FACTOR

PHASE ANGLE

VOLT / AMP DUAL FUNCTION

VOLT / HERTZ DUAL FUNCTION

VOLT / AMP / Hz

WATT / VAR DUAL FUNCTION

WATT / PF DUAL FUNCTION

WATT / VAR / PF

MODEL

NUMBER

2491-25 0-600V DC Volts Page 8

2491-11 2493-05

2491-21 2493-01 2493-02

2491-81 Single phase 150/300/600 Volt AC Hertz

2491-51 2491-52 2491-53 2491-54 2491-55

2491-61 2491-62 2491-63 2491-64 2491-65

2491-71 2491-72 2491-73 2491-74 2491-75

2491-91 2491-92 2491-93 2491-94 2491-95

2492-12 Single phase 150V/300V/600V 1 Amp

2492-22 Single phase 150V/300V/600V & 50/60Hz

2493-07 2493-08 2493-09

2492-40 2492-41 2492-42 2492-43 2492-44

2492-45 2492-46 2492-47 2492-48 2492-49

2493-34 2493-35 2493-36 2493-37 2493-38

CONNECTION

AVAILABLE*

Single phase

Three phase

Single phase

3P3W Delta

3P4W Wye

1P2W 1P3W 3P3W

3P4W (2 1/2 Element)

3P4W (3 Element)

1P2W 1P3W 3P3W

3P4W (2 1/2 Element)

3P4W (3 Element)

1P2W 1P3W

3P3W

3P4W (2 1/2 Element)

3P4W (3 Element)

1P2W 1P3W 3P3W

3P4W (2 1/2 Element)

3P4W (3 Element)

1P2W

3P3W Delta

3P4W Wye

1P2W 1P3W 3P3W

3P4W (2 1/2 Element)

3P4W (3 Element)

1P2W 1P3W 3P3W

3P4W(2 1/2 Element)

3P4W(3 Element)

1P2W 1P3W 3P3W

3P4W(2 1/2 Element)

3P4W(3 Element)

MAXIMUM

INPUT RATING

0-1/0-5 Amp AC 0-1/0-5 Amp AC

0-150/300/600 Volt AC 0-150/300/600 Volt AC 0-150/300/600 Volt AC

(select one)

120V/240V/480V AC 1 Amp 120V/240V/480V AC 5 Amp

(select one)

120V/240V/480V AC 1 Amp 120V/240V/480V AC 5 Amp

(select one)

120V/240V/480V AC 1 Amp 120V/240V/480V AC 5 Amp

(select one)

120V/240V/480V AC 1 Amp 120V/240V/480V AC 5 Amp

150V/300V/600V 5 Amp

150V/300V/600V & 400Hz

(select one)

150V/300V/600V AC

1A or 5A AC

50/60Hz or 400Hz

(select one)

120V/240V/480V AC 1 AMP 120V/240V/480V AC 5 AMP

(select one)

120V/240V/480V AC 1 AMP 120V/240V/480V AC 5 AMP

(select one)

120V/240V/480V AC 1 AMP 120V/240V/480V AC 5 AMP

ELECTRICAL

LEGEND

Amps AC/Kiloamps AC

Amps/Kiloamps

Volts AC/Kilovolts AC

Volts/Kilovolts

Watts

Kilowatts

Megawatts Page 10

Vars

Kilovars

Megavars

Power Factor

Lag

Lead

Phase Angle

Lag

Lead

Volts

Kilovolts

Amps

Kiloamps

Volts

Kilovolts

Hertz

Amps/Kiloamps

Volts

Kilovolts

Hertz

Watts/Kilowatts

Megawatts

Vars/Kilovars

Megavars

Watts

Kilowatts

Megawatts

Power Factor

Lag Lead

Watts/Vars

Kilowatts/Kilovars

Megawatts/Megavars

Power Factor

Lag Lead

ORDER

INFO.

Page 9

Page 17

Page 9

Page 17

Page 9

Page 10

Page 11

Page 12

Page 13

Page 18

Page 14

Page 15

Page 16

*see pages 17 through 21 for connection diagrams

General Specifications

4 digit red LED (9999 counts) for 2493 readouts (3 displays)

DISPLAY

AUXILIARY POWER

INPUT RATING

INPUT RANGE

Type Digit height Response time

Current: Voltage:

Frequency

Rated Current: Rated Voltage:

4 1/2 digit red LED for 2491, 2492

0.56 inch or 14mm 250ms min. update time for V/V/V, A/A/A, 2491 and 2492 Less than 500ms min. update time for V/A/Hz, Watt/VAR/PF 2493

120V or 240V AC (+/- 15%), 45-65 Hz, 4.5VA max. Select 24, 48, 125V DC or valuable DC power supplies

0 to 1 A AC; 0 to 5A AC 0-120V AC; 0-240V AC, 0-480V AC (W/VAR/PF/PA) 0-150V AC; 0-300V AC; 0-600V AC (Volt/Freq) 0-150V DC; 0-300V DC; 0-600V DC 50/60 Hz and 400 Hz (only V/A/Hz units)

A/W/VAR: 0-200%; PF/PA: 20-200% V/W/VAR: 0-120%; PF/PA: 50-120%; Frequency: 20-120%

Power Series

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Digital Switchboard Meters

INPUT FREQUENCY RANGE

SUSTAINED INPUT

BURDEN

ACCURACY

ANALOG OUTPUT AND RESPONSE TIME

OUTPUT RIPPLE

COMMUNICATIONS

ISOLATION VOLTAGE AND INSULATION RESISTANCE

Volts, Amps, Hertz

Rated Current: Rated Voltage:

Current: Voltage:

Reference condition:

25℃, 45-74%RH, at rated

input 60 Hz sine wave, 30 min. warmup

0 to 1 mA, 4 to 20 mA, 12+/-8 mA

Input to output/case: Aux. power to case:

Aux. power to output:

Output to case:

45-65 Hz up to the 9th harmonic measuring capability ±2% of specified accuracy

A/W/VAR/PF/PA: 200% continuous; 10x rating for 5 seconds V/W/VAR/FREQ: 120% continuous; PF/PA: 150% continuous

<0.2 VA per element <0.2 VA per element; 240V: <0.4VA per element

Voltage Current +/- 0.2% of reading +/- 0.1% of full scale Watt/VAR

Power Factor +/- 0.05 Power Factor Phase Angel +/- 0.5° Phase Angle Frequency +/- 0.1 Hz @ 40-70 Hz, +/- 0.5 Hz @ 300-500 Hz

10V DC compliance into 10k ohm load maximum 15V DC compliance into 750 ohm maximum 1 second maximum response time within ±1% of final value

0.5% peak-to-peak maximum of output span

RS-485 half duplex interface with networking up to 32 units Selectable Baud Rate

2500V AC for 1 minute / more than 10 Megohm @ 500V DC 2000V AC for 1 minute / more than 10 Megohm @ 500V DC DC: 500V DC minimum / 10 Megohm minimum @100V DC AC: 2000V AC for 1 minute / more than 10 Megohm @ 500V DC DC: 500V DC minimum / 10 Megohm minimum @ 100V DC 1000V AC for 1 minute . more than 10 Megohm @ 500V DC

TEMPERATURE RANGE

TEMPERATURE COEFFICIENT

INFLUENCE OF:

DIMENSIONS: WEIGHT:

Operating: Storage:

Display and Comm: Analog Output:

mAgnetic field: Input voltage: Influence of: Unbalanced current: Input frequency: Load resistance: (Analog input)

-20 to +60℃ at 90% RH maximum (non-condensing)

-40 to +85℃

±150 PPM/℃ maximum of full scale ±250 PPM/℃ maximum of full scale

0.5% maximum at 400 ampere turns/meter <0.05 Power Factor (10-120% of rated voltage) Shock/Vibration: per ANSI C39.1 <0.2% of full scale <0.05 Power Factor (45-65 Hz) 0 to 1 mA: 0-10K ohm within ±0.05% of full scale 4 to 20 mA, 12 ± 8 mA: 0-750 ohm within ±0.05% of full scale

W x D x H = 4.33 x 6.54 x 4.33 inches 1000g (2.2 lbs) or less

Power Series

Digital Switchboard Meters

DC VOLTS

MODEL FORMAT: 2491 Insert model code from the selection below: MODEL 2491

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1. FUNCTION

-25 DC VOLTS

6. AUX. POWER

-1 120/240V AC

-3 24V DC

-4 48V DC

-5 125V DC

2. INPUT RATING

-57 150V DC

-67 300V DC

-77 600V DC

3. FREQUENCY

-0 NONE

4. ANALOG OUTPUT

-AAA

-AFA

-AHD

5. COMMUNICATION

-1 YCA

-2 MODBUS

Power Series

Digital Switchboard Meters

AC AMPS / AC VOLTS / FREQUENCY

MODEL FORMAT: 2491 Insert model code from the selection below: MODEL 2491

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1. FUNCTION

-11 AMP AC

-21 VOLTS AC

-81 FREQUENCY

6. AUX. POWER

-1 120/240V AC

-3 24V DC

-4 48V DC

-5 125V DC

2. INPUT RATING

-01 1 AMP

-05 5 AMP

-10 150V

-20 300V

-30 600V

3. FREQUENCY

-1 50/60 Hz

-2 400 Hz

4. ANALOG OUTPUT

-AAA NO OUTPUT

-AFA 0 to 1 mA

-AHD 4 to 20 mA

5. COMMUNICATION

-1 YCA Protocol

-2 MODBUS

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