Pilz PMD s20 Data Sheet

Electronic monitoring relays PMDsigma

U

M

A1 A2

~

Power

B1 B2

Reset Test

G

Feedback
Earth

Y1 Y2 Y3

K1

K2

11 21

12 14 22 24

+

-

FE

Insulation monitor

PMD s20

Gertebild

Bildunterschrift

The insulation monitor monitors the in­sulation resistance of unearthed AC/
DC systems (IT systems). It meets the
requirements of EN 61557-8, IEC
60364-7-710 and DIN VDE 0100-710.

Approvals

PMD s20



Zulassungen

Unit features

Gertemerkmale

 Relay output:

2 auxiliary changeover contacts (C/
O)

 Detects symmetrical and asymmet-

rical insulation faults

 Two insulation measuring circuits
 Connection for external switch con-

tacts to trigger the manual reset
and for function testing

 Unit parameter settings are menu-

driven and infinitely variable via a
display and rotary encoder with key
function (turn and push)

 Configuration is stored on a chip

card

 Status indicators (LEDs) for:

– Supply voltage (Power)
– Insulation resistance
–Fault

Unit description

Gertebeschreibung

The insulation monitor monitors the in­sulation resistance of unearthed AC/
DC systems (IT systems). It meets the

requirements of EN 61557-8,
IEC 60364-7-710 and DIN VDE 0100­710 and may be used:

 To monitor unearthed AC/DC sys-

tems (including on board ships)

 In medical locations
 As a trip device if insulation resist-

ances are outside the permitted
range

Block diagram

Blockschaltbild

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

R

an

UB

t

t

LED

t

tr

0

1

R

ab

t

R

E

t

Reset

t

tr

tr

Auto reset

Manual reset

0

1

11

-

14

21

-

24

11

14

21 24

-

-

Hysteresis

UB = Versorgungsspannung/Supply voltage/Tension d'alimentation

R

an

= Ansprechwert/Response value/Seuil de déclenchement

R

ab

= Rücksetzwert/Release value/Valeur de réarment

R

E

= Isolationswiderstand/Insulation resistance/Résistance de'isolement

Insulation monitor

PMD s20

Function description

Funktionsbeschre ibung PMS s20

The insulation monitor prevents haz­ardous insulation faults in galvanically
separated systems. The insulation re­sistances are measured between the
network phases and the operating
earth. The measuring principle detects
symmetrical and asymmetrical insula­tion faults.

Relay outputs (K1 and K2)

K1 and K2 operate in normally ener­gised mode. In their default state, aux-

Timing diagram

iliary contacts 11-14 and 21-24 are
closed and auxiliary contacts 11-12
and 21-22 are open. Normally ener­gised mode is the default setting; this
setting can be changed via the menu.

Response resistance

If the insulation resistance falls below
the set response resistance R

an

ther of the two measuring circuits (R
< R

), the LED "Out 1" or "Out 2" will

an

light and the relay contacts will de-en­ergise.

Funktionsdiagram PMD s20

in ei-

 Response resistance Ran1:

Auxiliary contacts 11-14 will open
and auxiliary contacts 11-12 will
close (normally energised mode).

 Response resistance Ran2:

Auxiliary contacts 21-24 will open
and auxiliary contacts 21-22 will
close (normally energised mode).

Monitoring the operating earth

E

If the connection between the operat­ing earth and the FE terminal is bro­ken, contacts 11-12 and 21-22 will
close (normally energised mode).

Wiring

Inbetriebnahme _Isolationswäch ter

When commissioning, please note the
following:

 Output contacts 11-12-14 and 21-

22-24 are auxiliary contacts (e.g. for
a display or contactor control)

 Only wire the unit when the supply

voltage is switched off!

 Use copper wiring.
 To prevent contact welding, a fuse

should be connected before the
output contacts (see technical de­tails).

 Ensure that the cables are laid care-

fully, because an open circuit in the

measuring circuit will cause the unit
to malfunction.

 Ensure there is adequate fuse pro-

tection on the connection cables at
terminals B1 and B2.

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

L1

N

PE

1L1
1L2

E1

R

e

R

e

F1

F2

T1

Test

Y3

Reset

12

14

11

A1

A2

24

22

21

Y1

Y2

B1

B2

FE

PMD s20

Insulation monitor

PMD s20

 Only one insulation monitor should

be connected to galvanically con­nected systems.

Preparing for operation

Inbetriebnahme_Anschluss

 Supply voltage UB:

– Connect the supply voltage UB

to A1/A2. The supply voltage UB
can also be taken from the
measuring circuit.

 Measuring circuit (system to be

monitored):
– 2-phase system:
– Connect one phase of the moni-

tored system to the terminals

Application circuit AC

 A function test involving a real earth

fault (resistance) must be carried
out in order to check that the unit is
properly connected.

B1/B2 respectively.
– 3-phase system:
– Link terminals B1/B2 and con-

nect them to the system's star

point.

 Connect the output contacts in ac-

cordance with the relevant applica­tion circuit.

 Function test:

– By pressing a button at terminals

Inbetriebnahme_Anwendung_Bild_1

 Information given in the “Technical

details” must be followed.

Y1 and Y3
or

– Pressing the rotary knob for at

least 3 seconds

Leerzeilen

Inbetriebnahme

Please note:
Do not connect any cables to undesig­nated terminals.

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

L1

N

PE

E1

R

e

R

e

F1

F2

T1

~

=

G1

Test

Y3

Reset

12

14

11

A1

A2

24

22

21

Y1

Y2

B1

B2

FE

1L1
1L2

PMD s20

Insulation monitor

PMD s20

Application circuit DC

Inbetriebnahme_Anwendung_Bild_2

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

L1
L2

PE

1L1
1L2

E1

R

e

L3

R

e

F2

F1

T1

Test

Y3

Reset

12

14

11

A1

A2

24

22

21

Y1

Y2

B1

B2

FE

PMD s20

Insulation monitor

PMD s20

Application circuit 3 AC

Inbetriebnahme_Anwendung_Bild_3

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

L1
L2

1L1
1L2

E1

PE

L3

R

e

F1

F2

G1

T1

alternativ
alternative
alternatif

Test

Y3

Reset

12

14

11

A1

A2

24

22

21

Y1

Y2

B1

B2

FE

PMD s20

Insulation monitor

PMD s20

Application circuit 3 AC/DC

Inbetriebnahme_Anwendung_Bild_4

Inbetriebnahme

Parameter setting

Inbetriebnahme_Drehknop f_Funktion

The menu settings are made on the
unit's display via a rotary knob. You
have the option to make the settings

Installation

Montage_Sigma_allgemein

 The unit should be installed in a

control cabinet with a protection
type of at least IP54.

 Use the notch on the rear of the unit

to attach it to a mounting rail.

 In environments exposed to heavy

vibration or when installing on a ver­tical mounting rail (35 mm), the unit
should be secured using a fixing el­ement (e.g. retaining bracket or end
angle).

 Push the unit upwards or down-

wards before lifting it from the
mounting rail.

on the knob by hand or with a screw­driver. If you make the settings with a

screwdriver, the knob can remain
within the unit.

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

Insulation monitor

PMD s20

Notice

][WICHTIG_PDB_alt

This data sheet is only intended for use
during configuration. For installation
and operation, please refer to the op-

Montage

Technische Daten_P MDs20

erating instructions supplied with the
unit.

Technical details

Electrical data

Supply voltage UB AC/DC 24 - 240 V
Voltage tolerance -15 %/+10 %
Power consumption at U
Power consumption at U
Frequency range AC 50 - 60 Hz
Residual ripple DC 20 %
Utilisation category in accordance with EN 60947-4-1
Auxiliary contacts: AC1 at 240 V I

Auxiliary contacts: DC1 at 24 V I

Utilisation category in accordance with EN 60947-5-1
Auxiliary contacts: AC15 at 230 V I
Auxiliary contacts: DC13 at 24 V (6 cycles/min) I
Contact material AgCdO + 3.0 µm Au
External contact fuse protection (I
Blow-out fuse, quick
Auxiliary contacts: 6 A
Blow-out fuse, slow
Auxiliary contacts: 4 A

Measuring circuit

Rated mains voltage 0 ... 400 V
Rated mains voltage in according with UL 0 ... 300 V
Max. external voltage 460 V
Max. measuring voltage U
Max. measuring current I
Min. measuring circuit impedance 250 kOhm
Response value R

an

Max. response error in accordance with EN 61557-8 ±15 % ±1kOhm
Max. leakage capacitance 20 µF

Environmental data

EMC EN 61000-6-2, EN 61000-6-4
Vibration to EN 60068-2-6
Frequency 10 - 55 Hz
Amplitude 0.35 mm
Climatic suitability EN 60068-2-78
Airgap creepage in accordance with EN 60664-1
Pollution degree 2
Overvoltage category III
Rated insulation voltage 250 V
Rated impulse withstand voltage
Auxiliary contacts for the remaining circuits 6.00 kV
Supply voltage, measuring circuit for the remaining circuits 4.0 kV
Ambient temperature -10 - 55 °C
Storage temperature -40 - 85 °C

AC 5.0 VA

B

DC 2.5 W

B

min

P

min

P

max
max

= 1 kA) to EN 60947-5-1

K

M

M

±16 V
1 mA

10 ... 200 kOhm

: 0.10 A , I

: 1200 VA

max

: 0.10 A , I

: 120 W

max

: 3.0 A
: 2.0 A

max

max

: 5.0 A

: 5.0 A

1001753-EN-02-2011-05

Electronic monitoring relays PMDsigma

Insulation monitor

PMD s20

Environmental data

Protection type
Mounting (e.g. cabinet) IP54
Housing IP40
Terminals IP20
Condensation and ice formation not permitted

Mechanical data

Housing material
Housing PC
Front PC
Cross section of external conductors with screw terminals
1 core flexible 0.25 - 2.50 mm² , 24 - 12 AWG No. 760120
with crimp connectors, without insulating sleeve 0.25 - 1.00 mm² , 24 - 16 AWG No. 760120
without crimp connectors or with TWIN crimp connectors 0.20 - 1.50 mm² , 24 - 16 AWG No. 760120
Torque setting with screw terminals 0.50 Nm
Cross section of external conductors with spring-loaded termi-

nals: Flexible with/without crimp connectors
Stripping length 9 mm No. 761120
Dimensions
Height 98.0 mm
Width 45.0 mm
Depth 120.0 mm
Weight 270 g

Technische Daten

0.20 - 2.50 mm² , 24 - 12 AWG No. 761120

Cable capacitance Measuring time

0.5 µF 5 s

1 µF 10 s

5 µF 50 s

20 µF 240 s

Bestelldaten

Order reference

Type Features terminals Order no.

PMD s20 24 - 240 V AC/DC with screw terminals 760 120
PMD s20 C 24 - 240 V AC/DC with spring-loaded terminals 761 120

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