Safe Timer Relays
Delay-on Energisation
PZA
Delay-on energisation timer relay in
accordance with VDE 0113-1,
EN 60204-1, 12/97, EN 1088, 12/97
and IEC 204-1, 11/98.
Features
● Self-monitoring time circuits
● Timed release of locked safety
devices
Approvals
PZA
●
11/98,
Technical Details PZA
Electrical Data
Supply Voltage AC: 24, 48, 110, 120, 230 V
DC: 24 V
Tolerance 85 ... 110 %
Residual Ripple DC 10 %
Power Consumption Approx. 3.5 VA/4 W
Switching Capability in accordance
EN 60947-4-1, 02/01 AC1: 240 V/6 A/1500 VA
DC1: 24 V/6 A/150 W
EN 60947-5-1, 11/97 (DC13: 6 cycles/min.) AC15: 230 V/4 A; DC13: 24 V/3A
Output Contacts 1 safety contact (N/O),
2 auxiliary contacts (N/C)
Contact Fuse Protection 6 A quick or 4 A slow
(EN 60947-5-1, 08/00)
Times
Delay-on De-energisation Approx. 40 ms
Recovery Time 80 ms
Time Ranges
PZA 30 s: 3/4/5/7/9/12/15/18/21/24/27/30 s
PZA 300 s : 30/40/50/70/90/120/150/180/210/240/
270/300 s
Setting Accuracy
Start of the range 5 %
End of the range 2 %
Time Accuracy
1 % voltage change 0.06 %
1 °C temperature change 0.06 %
Repetition Accuracy ±1 %
Mechanical Data
Maximum Cross Section of 1 x 2.5 mm2 or 2 x 1.5 mm
External Conductors Single-core or multi-core with
crimp connectors
Dimensions (H x W x D) 87 x 45 x 121 mm
Weight AC: 350 g, DC: 260 g
2
4
●
●
Description
● 45 mm, P-93 housing, DIN-Rail
mounting
● Positive-guided relay outputs:
– 1 safety contact (N/O)
– 2 auxiliary contacts (N/C)
● LEDs for power and out
● 12 time-delay options, set via a
rotary switch
● Increase in the number of
safety contacts availableby
connecting expander modules.
Function Description
The PZA provides a delayed release
of a shotbolt, activated by applying
the operating voltage.
NSG-D-2-084-01/02
Safe Timer Relays
Delay-on Energisation
PZA
Internal Wiring Diagram
4
Time
circuit 1
Time
circuit 2
Feedback control loop
Y1 Y2
Input circuit
A1 (L+)
A2 (L-)
Power ON
Power Section
Reset
Connection Example
If the “start/reset” button is pressed
while the safety gate is closed, the
PZA de-energises. The safety gate
can not be opened. By pressing the
“stop” button, the relay K1 deenergises and the N/C contact K1
closes. After the set time period has
elapsed the safety contact of the
PZA closes. The safety gate switch
is released and the safety gate can
be opened by operating the switch
“open”.
Comparator
K1
K2
Comparator
level
K2
level
17 25 35
K1
K1
K2
18 26 36
Auxiliary
contacts
K2
Safety
contact
K1
K2
K1
L1
N
F1
A1 Y11Y12 Y21 xx 13 23 33 41
Y1 Y2 Y30 Y31Y32 14 24 4234 A2
PNOZ 6
Open
Y22
Reset /
Start
Stop
K1
A1 17 25 35 Y1 Y2
PZA
18 26 36 A2
K1
K1
NSG-D-2-084-01/02
4-2
Safe Timer Relays
Delay-on Energisation
PZA
General Technical Data
Unless stated otherwise in the technical details for the specific unit
Electrical Data
Frequency Range AC 50 ... 60 Hz
Residual Ripple DC 160 %
Contact Material AgSnO
Continuous Duty 100 %
Environmental Data
EMC EN 50081-1, 01/92, EN 61000-6-2, 03/00
Vibration in accordance with Frequency: 10 ... 55 Hz,
EN 60068-2-6, 04/95 Amplitude: 0.35 mm
Climatic Suitability DIN IEC 60068-2-3, 12/86
Airgap Creepage DIN VDE 0110 part 1, 04/97
Ambient Temperature -10 ... +55 °C
Storage Temperature -40 ... +85 °C
Mechanical Data
Torque Setting on Connection Terminals 0.6 Nm (screws)
Mounting Position Any
Housing Material Thermoplast Noryl SE 100
Protection Mounting: IP 54
2
Housing: IP 40
Terminal Range: IP 20
The units were tested in accordance with the relevant standards current at
the time of development.
Order References
Type t U
PZA 30 s 24 V DC 774 030
PZA 30 s 24 V AC 774 031
PZA 30 s 48 V AC 774 032
PZA 30 s 110 V AC 774 035
PZA 30 s 120 V AC 774 037
PZA 30 s 230 V AC 774 040
B
Order No.
4
NSG-D-2-084-01/02
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