Pilz PSWZ X1P Data Sheet

Safe monitoring relays

Standstill

PSWZ X1P

Standstill monitor for safe standstill
monitoring

Approvals

PSWZ X1P

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Unit features

` Positive-guided relay outputs:

– 2 safety contacts (N/O), instanta-

neous

– 1 auxiliary contact (N/C), instan-

taneous

` LED indicator for:

– Supply voltage
– Standstill on channel 1/2
–Switch status
– Fault signal if simultaneity time is

exceeded

` Semiconductor outputs signal:

– Error
–Switch status

` Semiconductor input for reset func-

tion

` Measuring inputs for single or

three-phase motors

` Measuring voltage selectable
` Feedback loop
` Plug-in connection terminals (either

cage clamp terminal or screw termi­nal)

` See order reference for unit types

Unit description

The unit is used for safe standstill
monitoring. It is designed for use on

` Standstill monitoring on plants with

dangerous machine parts or tools
(EN 1088 clause 7.4),

` Safety circuits in accordance with

EN 60204-1 and IEC 60204-1.
Standstill is only detected on power­free measuring circuits. Residual volt­ages, induced voltages or drives with­in the position control will prevent safe
standstill detection!

Safety features

` Relays K1 and K2 are interlocked in

such a way that the unit cannot be

switched back on in the case of

contact welding or an open circuit.

` The unit monitors the measuring

circuits for open circuit. If an open

circuit occurs between the unit and

the motor or on the motor itself, the

unit immediately switches off.

` The standstill monitor prevents the

plant from being enabled in the fol-

lowing cases

– Power supply failure

– Component failure

– Measuring circuits are open cir-

cuit

– Coil defect/open circuit

Block diagram

A1 A2

~

Power

=

L1

Feed-

back

L2 L3

Input

0 V 24 V

Y30 Y31 Y32 Y35Y1 Y2

Reset

RESET

K1

K2

23 41

13

14 24 42

Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

NSG-D-2-336-2006-10

Safe monitoring relays

Standstill

PSWZ X1P

Function description

The device uses two separate measur­ing channels to measure the regener­ated voltage, induced from the motor
during the rundown period or during
start-up. If the voltage falls below the
set response value (standstill thresh­old), the standstill monitor enables the
monitored plant. If the voltage ex­ceeds the set release value, the stand­still monitor disables the monitored
plant.
To reactivate, the voltage at both
channels must fall below the response
value U

within the time tg (simultane-

on

ity monitoring). To do this the feed­back loop Y1-Y2 must be closed. If the

Timing diagram

POWER

POWER

Feedback

Feedback

Output safe

Output safe

simultaneity requirement is exceeded,
the standstill monitor does not enable
the monitored plant. The unit can be
reactivated by switching 24 VDC on
and off at the RESET input.
The response value U

can be set

on

jointly for both channels in order to suit
the motor that is to be monitored. The
release value U

(hysteresis) corre-

off

sponds to twice the response value.
When used with frequency converters,
the PSWZ X1P cannot detect standstill
until the controller inhibit has been
switched off.
After the supply voltage is switched
on, the unit performs a self test. The
unit simulates a situation in which the
release value is exceeded and the

measuring circuit has an open circuit.
The correct function of the output relay
and feedback loop is also tested. The
test takes ca. 1.5 s.
Operating modes:

` Single-channel operation:

– One measuring circuit affects

both channels

– No redundancy (failsafe) in the

measuring circuits

` Dual-channel operation:

– Two redundant (identical) meas-

uring circuits affect channel 1
and 2

– Monitoring of voltages in the

measuring circuit (failsafe in the
event of a short circuit)

Output aux

Output aux

Semi Y35

Semi Y35

RESET

RESET

UL1/UL2

UL1/UL2

U

U

off

off

U

U

on

on

Key

` POWER: Supply voltage
` UL1/UL2: Input circuitL1, L2, L3
` Feedback: Feedback loop Y1-Y2
` Output safe: Safety contacts 13-14,

23-24

Wiring

Please note:

` Information given in the “Technical

details” must be followed.

` Outputs 13-14, 23-24 are safety

contacts, output 41-42 is an auxilia­ry contact (e.g. for display).

` To prevent contact welding, a fuse

should be connected before the

t < tg

t < tg

t > tg

t > tg

` Output aux: Auxiliary contact 41-42
` Semi Y35: Semiconductor output

for fault signal

` RESET: Reset input RESET

: Response value

` U

on

output contacts (see technical de­tails).

` Use copper wire that can withstand

60/75 °C.

` When used with converters: Use

screened cable for the wiring be­tween the standstill monitor and the

50 ms

50 ms

1,5 s

1,5 s

` U

: Release value

off

` tg: Simultaneity

motor. Connect the cable screening

on the motor.

Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

NSG-D-2-336-2006-10Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany

-2

Safe monitoring relays

Standstill

PSWZ X1P

Preparing for operation

` Supply voltage

Supply voltage AC DC

A1

A2

L1

N

` Input circuit

Input circuit Single-phase motor Three-phase motor

L1
N

M

~

L1
L2
L3

L1
L2
L3

M

~

` Feedback loop

Contacts from external contactors or link

Y1
Y2

13 (23)
14 (24)

K5

K6

K5

K6

L1
N

A1

A2

L+

L-

L1
L2
L3

Y1

Y2

` Semiconductor output

Y32: Semiconductor output for switch sta­tus
Y35: Semiconductor output for fault signal

Y31
Y32
Y35
Y30

` Semiconductor input

SPS Output

0 V

Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

RESET

Y30

24 V DC
SPS Input
SPS Input
0 V

NSG-D-2-336-2006-10