PILZ PNOZ X4 24VDC Safety Relay Instruction Manual

1. Introduction

This manual provides essential information for the safe and efficient installation, operation, and maintenance of the PILZ PNOZ X4 24VDC Safety Relay. Please read this manual thoroughly before attempting any procedures with the device. Keep this manual for future reference.

The PILZ PNOZ X4 24VDC is designed for monitoring safety functions such as E-STOP pushbuttons, safety gates, and light grids in industrial applications.

2. Safety Instructions

WARNING: Failure to follow these safety instructions may result in serious injury or death, and/or damage to equipment.

• Only qualified personnel familiar with safety control systems and electrical installations should install, operate, or maintain this device.
• Disconnect all power before performing any installation or maintenance work.
• Ensure all wiring conforms to local and national electrical codes.
• Do not bypass or disable safety functions.
• Regularly inspect the device for damage or malfunction.
• The device must be used within its specified technical data.

3. Product Overview

The PILZ PNOZ X4 24VDC is a safety relay designed for monitoring safety circuits. It features 3 normally open (n/o) safety contacts and 1 normally closed (n/c) auxiliary contact.

Figure 1: Front view of the PILZ PNOZ X4 24VDC Safety Relay. This image shows the compact housing, terminal connections, and status indicators of the safety relay.

Key Features:

• Supply Voltage: 24 VDC
• Safety Contacts: 3 N/O
• Auxiliary Contacts: 1 N/C
• Applications: E-STOP, safety gates, light grids
• Mounting: DIN Rail Mount

4. Setup and Installation

4.1 Mounting

The PNOZ X4 24VDC is designed for DIN rail mounting. Ensure adequate ventilation around the device.

1. Attach the safety relay to a standard 35mm DIN rail.
2. Ensure the device is securely fastened and does not wobble.

4.2 Wiring

Refer to the wiring diagram provided with the device or in the detailed technical documentation for specific connection details. Below are general guidelines:

• Power Supply (A1/A2): Connect 24 VDC to terminals A1 (+) and A2 (-).
• Input Circuit (S11/S12, S21/S22): Connect the safety device (e.g., E-STOP, safety gate switch) to the input terminals. For single-channel operation, bridge S11 and S21. For dual-channel operation, connect each channel separately.
• Feedback Loop (Y1/Y2): Connect the feedback loop from the contactors or output devices to ensure proper monitoring.
• Output Contacts (13/14, 23/24, 33/34): These are the safety outputs. Connect them to the control circuit of the machinery to be safely shut down.
• Auxiliary Contact (41/42): This non-safety contact can be used for signaling or indication purposes.

CAUTION: Incorrect wiring can lead to dangerous situations and system failure. Always verify wiring before applying power.

5. Operation

5.1 Initial Power-Up

1. After completing all wiring, apply 24 VDC power to the device.
2. Observe the status indicators on the front panel. Typically, a green LED indicates power and readiness, while other LEDs may indicate input status or faults.

5.2 Function Test

Perform a thorough function test after installation and before initial operation:

• Activate each connected safety device (e.g., press E-STOP, open safety gate, interrupt light grid).
• Verify that the safety relay de-energizes its output contacts (13/14, 23/24, 33/34) and the connected machinery stops safely.
• Reset the safety device and verify that the safety relay re-energizes its output contacts, allowing the machinery to restart (if conditions permit).

IMPORTANT: Regular function tests are crucial for maintaining safety integrity. Refer to relevant safety standards for recommended test intervals.

6. Maintenance

The PILZ PNOZ X4 24VDC Safety Relay is designed for minimal maintenance. However, regular checks are recommended to ensure continued safe operation.

6.1 Routine Checks

• Visual Inspection: Periodically inspect the device for any signs of physical damage, loose connections, or discoloration.
• Function Test: Perform the function test described in Section 5.2 at regular intervals, as determined by your risk assessment and local regulations.
• Cleaning: Keep the device free from dust and debris. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.

6.2 Troubleshooting

If a fault is detected, refer to the Troubleshooting section (Section 7) before attempting any repairs.

7. Troubleshooting

This section provides guidance for common issues encountered with the PNOZ X4 24VDC Safety Relay.

For issues not listed here, or if solutions do not resolve the problem, contact PILZ technical support.

8. Technical Specifications

9. Warranty and Support

9.1 Warranty Information

PILZ products are manufactured to high-quality standards. For detailed warranty terms and conditions, please refer to the official PILZ website or contact your local distributor. Keep your purchase receipt as proof of purchase.

9.2 Technical Support

If you require technical assistance, have questions regarding installation, operation, or troubleshooting, please contact PILZ technical support. Have your product model number (774730) and any relevant system details ready when you call.

You can find contact information for your region on the official PILZ website.