Pilz P1WU Data Sheet

Electronic Monitoring Relays

True power monitoring

P1WU

Technical Details P1WU

Electrical data

Supply voltage 3 AC/1 AC: 42, 110, 230, 400, 415, 500,

Tolerance 85 ... 110 %
Power consumption Approx. 5 VA
Switching capability in accordance
with EN 60947-4-1, 10/91 AC1: 240 V/0.1 ... 5 A/1100 VA

Output contacts 1 auxiliary contact (C/O)
Contact fuse protection 6 A quick or 4 A slow
in accordance with EN 60947-5-1, 10/91
Max. switch-on current 10 A AC

Measuring circuit

Adjustable measuring range limit values

True power monitor for 1- and
3-phase supplies for monitoring
the minimum true power values

Features

● Direct measurement of motors

with a 2.2 kW (400 V) rating

● Output signal either latching/

non-latching

● Adjustable reaction times

● Trip device if underload occurs

● Operates to normally energised

or normally de-energised mode

● Suitable for current transformers

Max. overload 1 A version: 1.2 A, 6 A/max. 3 s

Response delay 1 A version: 0.25 ... 3 s adjustable

Start-up suppression time 0.5 ... 20 s adjustable
Requirement for current transformer 1 A version: 1.5 ... 7.5 VA

Mechanical data

Max. cable cross section 2 x 2.5 mm
of external conductor Single-core or multi-core with crimp

Torque setting for connection terminals 1.2 Nm (screws)
Dimensions (H x W x D) 75 x 90 x 115 mm
Weight 470 g

550 VAC

DC1: 24 V/0.1 ... 1 A/240 W

1 A version: 0...0.35; 0.25...0.7; 0.67...1 A
5 A version: 0 ... 1; 1.1 ... 3; 3.3 ... 5 A

5 A version: 6 A, 25 A/max. 3 s

5 A version: 0.25 ... 30 s adjustable

5 A version: 2.5 ... 15 VA

2

connector

4

Description

The true power monitor P1WU is
enclosed in a 90 mm wide P-75
housing. All three external conduc­tors are used as the supply voltage.
There are 7 versions available for
use with three-phase AC-voltage
supplies.
Features:

● Relay output: 1 auxiliary contact

(C/O)

● 2 versions with adjustable

measuring ranges up to max. 1 A
or up to max. 5 A

● Underload switching points

● Adjustable response delay

● Adjustable start-up suppression

time

● Automatic or manual reset

● LED for supply voltage and

switching status of the auxiliary
contacts P

min

The P1WU monitors whether the true
power falls below a defined level on
an AC or three-phase current supply.
The signal, which is proportional to
the true power, is derived from
multiplying the current and voltage.
The minimum permitted true power
P

is set using a potentiometer. If

min

the measured true power PW falls
below the preset value P
output relay K1 switches and the
red LED will be on.

min

, the

Pilz GmbH & Co., Felix-Wankel-Straße 2, 73760 Ostfildern, Deutschland NSG-D-2-236-10/00
Telefon [phone], Telefax [phone], E-Mail: [e-mail]

Electronic Monitoring Relays

True power monitoring

P1WU

Internal wiring diagram

L1

k

I

I

M

M

U

L1

U

I

I

int

n*I

I

M

int

U(I)

Y1 Y2

L1

L2

L3

Power supply

cos j*k

L1 *

int

*

t

a

+

0

P

& &

P

min

P

min-PW

DP

min

t

r

Control logic

14

12

K1

11

Y3
Y4
Y5

4

W

V

I

Measuring currents

M

n Measuring range factor
U

L1

Measuring voltages

Timing diagram

Measuring circuit

Operating voltage U

Output P

min

Output P

min

B

(K1, RB)

(K1, AB)

RB Normally energised mode
AB Normally de-energised mode
P

Response value Underload

min

UL1Measuring voltage at L1

N

cos j Power factor
k Correction factor

Start-up suppression time

t

a

P

max

P

min

0

1

0

1

0

1

0

t

a

I

Measuring current

M

I

Internal measuring current

int

cos j Power factor

t

r

PW < P

k Correction factor

PWTrue power
P

Min. true power

min

t

Response delay

r

min

n Measuring range factor
t

Start-up suppression time

a

t

Response delay

r

Pilz GmbH & Co., Felix-Wankel-Straße 2, 73760 Ostfildern, Deutschland NSG-D-2-236-10/00
Telefon [phone], Telefax [phone], E-Mail: [e-mail]

Electronic Monitoring Relays

True power monitoring

P1WU

Connection examples

● Example 1

Monitoring a three-phase motor, I < 5 A

L1
L2
L3

F1

L3L111 Y1 Y2 kN

L2

P1WU

Y4 Y512 14 Y3 U(I) V

W

K1

UVW

M1

M3~
£ 5 A

I

PE

N

● Example 2

Monitoring a three-phase motor(with current converter); I > 5 A

L1
L2
L3

F2

L3L111 Y1 Y2 kN

k K

T1

l L

W

P4B-3NK

P1WU

Y4 Y512 14 Y3

F1

L2

U(I) V

4

K1

UVW

M1

M3~

I > 5 A

PE

N

Pilz GmbH & Co., Felix-Wankel-Straße 2, 73760 Ostfildern, Deutschland NSG-D-2-236-10/00
Telefon [phone], Telefax [phone], E-Mail: [e-mail]

Electronic Monitoring Relays

True power monitoring

P1WU

● Example 3

Monitoring a single-phase motor, I < 5 A

L1
N

F1

N

11 Y1

P1WU
12 14

Y2

Y3

Y4Y5U(I)

k

L1

L2 L3

VW

4

K1

M1

PE

● Example 4

Monitoring a single-phase motor; I > 5 A

L1

N

F1

11 Y1NY2

P1WU

Y3

12 14

k

Y4Y5U(I)

L1

L2 L3

VW

U1 U2

M 1~

I £ 5 A

N

F2

k K

T1

l L

K1

U1 U2

M1

M 1~

I ³ 5 A

PE

N

Pilz GmbH & Co., Felix-Wankel-Straße 2, 73760 Ostfildern, Deutschland NSG-D-2-236-10/00
Telefon [phone], Telefax [phone], E-Mail: [e-mail]

Electronic Monitoring Relays

True power monitoring

P1WU

General Details

Unless stated otherwise in the technical details for the specific unit.

Electrical data

AC frequency range 50 ... 60 Hz
DC residual ripple 160 %
Contact material AgCdO
Continuous duty 100 %

Environmental data

EMC EN 50 081-1, 01/92; EN 50.082-2, 03/95
Vibration in accordance
with EN 60068-2-6, 04/95 Frequency: 10 ... 55 Hz,

Climatic suitability IEC 60068-2-3, 1969
Airgap creepage DIN VDE 0110-1, 04/97
Ambient temperature -10 ... +55 °C
Storage temperature -40 ... +85 °C

Mechanical data

Torque setting for connection terminals 0.6 Nm (screws)
Mounting position Any
Housing material Thermoplastic Noryl SE 100
Protection types Mounting: IP 54

Amplitude: 0.35 mm

Housing: IP 40
Terminals: IP 20

Order references key

U BSupply voltage
I MMeasuring current
taStart-up suppression time
trResponse delay

Order references

Type U

P1WU 110 VAC 5 A 20 s 3 s 489 103
P1WU 230 VAC 5 A 20 s 3 s 489 105
P1WU 400 VAC 5 A 20 s 3 s 489 110
P1WU 415 VAC 5 A 20 s 3 s 489 117
P1WU 460 VAC 5 A 20 s 3 s 489 118
P1WU 500 VAC 5 A 20 s 3 s 489 120
P1WU 230 VAC 5 A 20 s 30 s 489 132
P1WU 400 VAC 5 A 20 s 30 s 489 135
P1WU 415 VAC 5 A 20 s 30 s 489 140
P1WU 460 VAC 5 A 20 s 30 s 489 143
P1WU 500 VAC 5 A 20 s 30 s 489 145
P1WU 400 VAC 1 A 20 s 3 s 489 330
P1WU 500 VAC 1 A 20 s 3 s 489 335

B

I

M

t

a

t

r

Order no.

4

Pilz GmbH & Co., Felix-Wankel-Straße 2, 73760 Ostfildern, Deutschland NSG-D-2-236-10/00
Telefon [phone], Telefax [phone], E-Mail: [e-mail]