Yokogawa CW120, CW121 Operations Guide
User’s
Manual
IM CW120P-E
Thank you for purchasing our CW120 or CW121 Clamp-on Power Meter. This
Operation Guide explains the fundamental operations of the CW120 and CW121 so
as to get you started using the CW120 or CW121 even if you are a first-time user.
For more information of measurement and details of each function, see the User’s
Manual, IM CW120-E. To ensure safe and correct use of the CW120 and CW121,
thoroughly read the handling precautions in User’s Manual, IM CW120-E, before
use.
Before starting measurement with your CW120 or CW121, fill in the Setting
Check Sheet in the back of this guide with your particular settings, to facilitate
setting on site without error.
CW120/121
CLAMP-ON POWER METERS
Operation Guide
Contents
1.Functions and Operation Flow ........................................................................ 2
2.Operation Keys and Terminals........................................................................ 4
3.Display <Section 2.4> ..................................................................................... 5
4.Browsing Measured Values <Sections 8.2 and 9.3>....................................... 6
5.Changing Range Settings <Sections 6.2 and 6.3> ......................................... 6
6.Changing Wiring Method <Section 6.4>.......................................................... 7
7.Changing Settings <Chapter 7> ...................................................................... 8
8.Saving Data..................................................................................................... 9
9.Starting and Ending Integration <Section 9.2>.............................................. 10
10.Meanings of Messages <Section 2.4> .......................................................... 10
Setting Check Sheet ........................................................................................... 11
Throughout this manual, references to sections or chapters of the User’s Manual (IM
CW120-E) are enclosed in angle brackets, such as <Chapter 4>.
3rd Edition May 2007(KP)
IM CW120P-E
1. Functions and Operation Flow
● Schematic Function Diagram
Power-on
Measurement
screen
key
<Chapter 9>
Electric energy (watt-hour)
measurement
Start of
integration
7.2.8 Setting integration start time
7.2.9 Setting integration stop time
End of
integration
Data saving
Auto-saving
7.2.7 Setting output interval
File: AWTH000.CSV
External control terminals
Input Output
7.2.11 Selecting communication device
key
Setting device number
7.2.1
Loading/saving settings
7.2.2
Deleting file and formatting PC card
7.2.3
Clearing electric energy count (watt-hours)
7.2.4
and resetting system
Copying and clearing backup memory
7.2.5
contents
Setting date
7.2.6
Setting output interval
<Chapter 8>
Instantaneous value
measurement
Data saving
key
File: MWTH000.CSV
Communication interface
(chosen when ordering)
7.2.7
Setting integration start time
7.2.8
Setting integration stop time
7.2.9
Setting whether to save data to PC card
7.2.10
Selecting communication device
7.2.11
Making communication settings
7.2.12
Setting Communication protocol
7.2.13
Setting VT ratio
7.2.14
Setting CT ratio
7.2.15
Selecting probe to be used
7.2.16
Setting decimal point and unit of electric
7.2.17
energy (watt-hours)
7.2.2 Loading/saving setting File: WTH000.SET
RS-485RS-232
PC Printer PC
Setting
screens
<Chapter 7>
Saving settings
PC card
7.2.10 Setting whether to
save data to PC card
● On-screen Information (Measured Data)
Instantaneous value measurement
Item Unit Displayed Name
Rms voltage V V1, V2, V3 (differs depending on the wiring method)
Rms current A A1, A2, A3 (differs depending on the wiring method)
Active power W
Reactive power Var
Power factor —
W, W1, W2, W3 (differs depending on the wiring method)
Var, Var1, Var2, Var3 (differs depending on the wiring method)
PF, PF1, PF2, PF3 (differs depending on the wiring method)
Frequency Hz Hz (input frequency of V1)
Electric energy measurement
Item Unit Displayed Name
Active electric energy Wh
Regenerative electric energy Wh Only saved; not displayed
Six items of instantaneous value measurement
2
Wh, Wh1, Wh2, Wh3 (differs depending on the wiring method)
IM CW120P-E
● Basic Operation Flow
Connect power supply
to CW120/121
<Chapter 4>
Turn on power to
CW120/121
Startup screens
Measurement
screen
Setting screen
Measurement
screen
:Calls up wiring setting
key
:Calls up voltage range
key
setting
:Calls up current range
key
setting
Perform
wiring
<Chapter 4>
<Chapter 4>
When no setting is needed
key
<Chapter 7>
key
<Chapter 6>
<Chapter 5>
IM CW120P-E
(press 3 sec):
Check wiring for error
key
Check result
screen
key
Measurement
Instantaneous value
measurement
Electric energy
measurement
When skipping
wiring check
<Chapter 5>
<Chapter 8>
<Chapter 9>
3
2. Operation Keys and Terminals
● Keys
Section numbers enclosed in angle brackets indicate references in the User’s Manual (IM
CW120-E).
Displays the voltage range.
Used to set and change the
current range <Section 6.3>.
Used to set and change the
voltage range <Section 6.2>.
Saves the measured data
during instantaneous value
measurement <Section 8.3>.
Integration status LED
indicator <Section 9.2>
Starts and stops integration;
press this key for one second
to start and stop integration
manually <Section 9.2>.
• In setting screen: Cancels a setting <Section 7.2>.
• In measurement screen: Pressing this key for three
seconds accesses the screen for clearing the
electric energy count <Section 9.2.3>.
Displays the wiring method (phase lines).
Confirms an entry such as a change to a
setting <Section 7.2>.
Displays the current range.
• Used to set and change the
wiring method (phase lines)
<Section 6.4>.
• Pressing this key for three
seconds accesses the wiring
check screen <Section 5.5>.
• Switches on/off the back light of
the LCD <Section 12.1>.
• Pressing this key for three
seconds locks the keys. To
unlock, press the key again for
three seconds or more <Section
12.1>.
Switches over the display
between the measurement and
setting screens <Section 7.1>.
• In measurement screen:
Switches the display contents
<Sections 8.2 and 9.3>.
• In setting screen: Changes the
selection or number, or moves
the cursor position (flashing
digit) over digits <Sections 7.2>.
● Input Connectors
Voltage input terminals Current input terminals
CW120: Supports from single-phase two-wire to
three-phase three-wire circuits
Voltage input terminals: N, V1, V2
Current input terminals: CH1, CH2
CW121: Supports from single-phase two-wire to
three-phase four-wire circuits
Voltage input terminals: N, V1, V2, V3
Current input terminals:
● Side Panels
PC card eject button PC card eject button
PC card slot
RS-232
connector
Power switch Power supply connector Power switch Power supply connector
Model with RS-232 interface Model with RS-485 interface
4
External control
terminals
PC card slot
RS-485 screw
terminals
CH1, CH2, CH3
IM CW120P-E
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