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 +49 (7 11) 34 09-0, Telefax +49 (7 11) 34 09-1 33, E-Mail: pilz.gmbh@pilz.de
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 +49 (7 11) 34 09-0, Telefax +49 (7 11) 34 09-1 33, E-Mail: pilz.gmbh@pilz.de
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