beautypg.com

App index – Yokogawa Value Series FX1000 User Manual

Page 98

background image

Measurement Channels and

Alarms

IM 04L21B01-01EN

3-25

3

2

1

4

5

6

7

8

9

10

11

12

13

14

App

Index

Examples of power measurement expressions are given below.

• Example 1: Active power

Expression

Channel

Expression

Unit

Description

101

WATP

W

Active power (W)

• Example 2: Voltage 1

Expression

Channel

Expression

Unit

Description

101

VOL1

V

Input voltage (V) of

voltage 1

• Example 3: Current 1

Expression

Channel

Expression

Unit

Description

101

CUR1

A

Input current (A) of

current 1

• Example 4: Active energy

The following is an example of active energy that is calculated with a certain number

of significant digits. When the active energy reaches the maximum value that can
be indicated with the available number of digits, the value wraps around, like a
commercial energy meter. In this example the active energy is calculated in the range
of 0000.000 [kWh] to 9999.999 [kWh]. When the active energy reaches 9999.999 [kWh],
it is restarted from 0000.000 [kWh].

Expression

Channel

Expression

Unit

Span

Description

101

_WATP_*K01

(User-

specified)

0000.000

to

9999.999

The low-cut power (kW)

102

CARRY(K02):TLOG.

SUM(101)

kWh

0000.000

to

9999.999

The active energy that wraps

around at a certain value (kWh)

Constant

Constant Number

Value

Description

K01

0.001

Constant used to convert the value to kW

K02

10000

Threshold value to reset

TLOG Settings

Channel

Timer No.

Sum Scale Reset

Description

102

(User-

specified)

/h

Off

This is the sum scale. When settings are

reset, this is set to Off.

Note

When you are performing an electric energy measurement that uses TLOG, use one of the
following methods to ensure that a computation overflow does not occur. When a computation
overflow occurs, the value is not automatically reset.
• Use the CARRY operator so that the value will be reset when it exceeds a specified value (see

example 4).

• Reset the value at the specified time.

In this situation, change the settings in example 4 as shown below.

Operator: Remove the CARRY operator from channel 102.

TLOG settings: Specify the timer number, and turn reset on. Use the timer settings for

the timer specified in the TLOG settings to specify when the value will be reset (see
section 7.1).

3.12 Measuring Power (/PWR1 Option)