Specifications are subject to change without notice (06.04.10)

3

Mode of Operation

Asymmetry definition.

Asymmetry is an indicator of

the mains quality and it is

defined as the absolute val-

ue of the maximum devia-

tion among the mains volt-

ages, divided by the nominal

voltage of the 3-phase sys-

tem. The definition changes

according to the voltage ref-

erence:

1) in case of measuring

phase-phase voltages:

max |

∆V

PH-PH|

V∆NOM

2) in case of measuring

phase-neutral voltages:

max |

∆V

PH-N|

V NOM

Tolerance definition.

Tolerance is another indicator

of the mains quality and it is

definied as the absolute val-

ue of the maximum deviation

of the mains voltages from

the nominal voltage, divided

by the nominal voltage of the

3-phase system. The defini-

tion changes according to

the voltage reference:

1) in case of measuring

phase-phase voltages:

max |V∆NOM - VPH-PH|

V∆NOM

2) in case of measuring

phase-neutral voltages:

max |V NOM - VPH-N|

V NOM

Connected to the 3 phases

(and

neutral)

DPC01

and

PPC01 operate when all 3

phases are present at the

same time and the phase

sequence is correct. It can

be decided whether to mon-

itor upper and lower voltage

level of each phase or their

asymmetry and tolerance.

Voltage level monitoring:

if one or more phase-phase

or

phase-neutral

voltage

exceed the upper set level

or drop below the lower set

level, the red LED starts

flashing

2

Hz

and

the

respective

output

relay

releases after the set time

period.

Asymmetry and tolerance

monitoring:

if one or more phase-phase

or

phase-neutral

voltage

exceed the set levels the red

LED starts flashing 2 Hz and

the respective output relay

releases after the set time

period.

Note: For both functions, if

the

phase

sequence

is

wrong or one phase is lost,

both output relays release

immediately. Only 200 ms

delay occurs. The failure is

indicated by the red LED

flashing 5 Hz during the

alarm condition.

Example 1

(Mains monitoring - over and

under phase-phase voltage)

The relay monitors over and

under voltage, phase loss

and

correct

phase

sequence.

Example 2

(Motor monitoring - starting

and operating load -asym-

metry

and

tolerance

of

phase-neutral voltage)

DPC01 and PPC01 ensure

correct starting and operat-

ing conditions. They monitor

the

voltage

level,

phase

sequence (correct direction

of the motor rotation) and

asymmetry.

Frequent failures are fuse

blowing and incorrect volt-

age level. In case of fuse

blowing the motor regener-

ates a voltage in the inter-

rupted

phase.

The

relay

detects the failure and reacts

due to excessive imbalance

among the phases.

DPC01, PPC01

Function/Range/Level/Time Setting

Adjust the input range set-

ting the DIP-switches 3 and

4. Select the desired func-

tion setting the DIP-switches

5 and 6 as shown below. To

access

the

DIP-switches

open the plastic cover using

a

screwdriver

as

shown

below.

Centre knobs:

Setting of upper ( ) and low-

er ( ) level or setting of

asymmetry (ASY) and toler-

ance (

) on relative scale.

Lower knobs:

Setting of delay on alarm

times (DELAY 1, DELAY 2)

on absolute scale:

0.1 to 30 s.

AL

1

3

0.1

30s

0.3

10

DELAY2

1

3

0.1

30s

0.3

10

DELAY1

2

22%

6

18

10

14

2

22%

6

18

10

14

/

1

3

0.1

30s

0.3

10

DELAY2

1

3

0.1

30s

0.3

10

DELAY1

2

22%

6

18

10

14

2

22%

6

18

10

14

/

AL

DPC01

DPC01 400 HZ

x 100

x 100

x 100

x 100

L1

N

L3

L2

max V

D

PH-N = V’

-V’

L3-N

L2-N

||

|

|

N’

V= V

L1-N

NOM

L2-N

L3-N

= V=V

L1

N

L3

L2

L1’

L3’

L2’

V’

L3-N

V’

L2-N

max V

D

PH-N = 0

ASY=0

|

Þ

|

max V

NOM-V

= V

-V’

= V

-V’

= V

-V’

PH-N

NOM

L1-N

NOM

L2-N

NOM

L3-N

|

|| || ||

|

max V

NOM

PH-N

NOM

L3-N

-V

= V

-V’

|

||

|

Example: phase-neutral monitoring

Example: phase-phase monitoring

AL

1

3

0.1

30s

0.3

10

DELAY2

1

3

0.1

30s

0.3

10

DELAY1

2

22%

6

18

10

14

2

22%

6

18

10

14

/

PPC01