11. OTHER PROGRAMMING

11.5 Alarm

Alarm parameters (alarm types, alarm value, etc.) can be programmed for each alarm point (channel, level). By programming the alarm parameters, alarm activation can be displayed and also the activation and reset can be

printed. See Section 10.3. Press SHIFT

and ALARM simultaneously to display the [Alarm] programming screen.

 

8

Alarm output is an option. The alarm outputs for “FAiL (failure) ” and “C. End (chart paper end)” are available in addition to measured values.

1 Alarm Parameters

The default is no alarm programmed.

1) Alarm points (Channel, level)

Alarm point can be programmed up to level 4 for each channel. “FAiL” and “C. End” can be programmed instead of the channels.

FAiL…Alarm when the hardware except servo-circuit/mechanism is abnormal

In this condition, the status lamp is not lit.

C. End…Alarm at just before when the chart paper ends.

2) Alarm types

10 different alarm types can be selected for each alarm point.

Absolute

: High alarm

: Low alarm

: High alarm with

: Low alarm with

value

 

standby

standby

Rate-of-

: Increase limit

: Decrease limit

change

 

 

 

: Differential high

: Differential low

Differential

alarm

alarm

: Differential high

: Differential low

 

alarm with standby

alarm with standby

3) Alarm value

Value for alarm activation

4) Others

Rate-of-change alarm: Program measuring count (1 to 20)

Differential alarm: Program channels to be compared.

Relations between alarm

parameters and alarm activation

Absolute value alarm

 

1

1

1

1

Channel

Alarm

Alarm

1

2

3

4

Level

points

L

H

H

H

Alarm type

 

specifications

 

0

0

0

0

(Relay No.)*

 

 

 

 

35

50

60

70

Alarm value

0

Measured value 100

(55)

(1)The above figure shows programming alarm point up to level 4 on CH 1.

(2)Alarm is in active at level 2 (high alarm) as the

measured value (55) is higher than the alarm value (50).

*No alarm output is provided to the standard specifications and the relay No. is fixed to “0”. Refer to Section 12.2 for the programming of relay No.

2

Alarm Types

The high alarm for the absolute value activates when the measured value equals to or is higher than the alarm value. The low alarm activates when the measured value equals to or is lower than the alarm value.

For the rate-of-change alarm and the differential alarm, refer to the followings.

Rate-of-change alarm

Increase limit alarm: Change width (PV2 to PV1) per unit

time (t) is plus.

Decrease limit alarm: Change width (PV2 to PV1) per unit time (t) is minus.

alarm value

U

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Change width

 

0

 

 

 

 

 

 

 

 

 

 

 

 

△t

 

 

 

 

 

alarm value*

(PV2 to PV1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High alarm Low alarm

 

 

 

 

 

 

 

 

 

 

 

 

Unit time (t) = Measuring interval (about 0.1 sec.) x Measuring count (1 to 20)

*Do not apply a “minus” symbol to the alarm value of the decrease limit alarm ().

Alarm with standby

This is the function not to activate an alarm until the alarm becomes in reset condition, even if the alarm is in active condition. This function is only available when the power supply is turned on. When changing parameters, this function is only available by reprogramming it after clearing once.

Differential alarm

(Differential high alarm)

(Differential low alarm)

Alarm

 

 

 

 

 

 

 

Difference of measured

 

 

value

 

 

 

 

 

 

Alarm

value (absolute value)

 

 

 

 

 

 

Difference of measured

 

 

 

value

 

 

 

 

value (absolute value)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Alarm activation

 

Alarm activation

Difference of measured value (absolute value) equals to or is higher than alarm value: Differential high alarm activation Difference of measured value (absolute value) equals to or is lower than alarm value: Differential low alarm activation

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Omega RD2800, RD200 manual Alarm Parameters, Alarm Types