PILZ PNOZ/X7/24VAC/DC Safety Relay Instruction Manual

1. Introduction

This manual provides essential information for the safe and efficient installation, operation, and maintenance of the PILZ PNOZ/X7/24VAC/DC Safety Relay. Please read this manual thoroughly before using the device and keep it for future reference. Adherence to these instructions is crucial for ensuring proper function and preventing hazards.

The PILZ PNOZ/X7/24VAC/DC is a safety relay designed for monitoring E-stop buttons and safety gates. It features 1-channel wiring, 2 normally open (NO) contacts, and automatic reset functionality, operating on 24VAC/DC power.

2. Safety Information

WARNING:

• Installation, commissioning, and maintenance must only be carried out by qualified electricians.
• Observe all national and international safety regulations and standards.
• Disconnect power before performing any work on the device.
• Do not bypass or disable safety functions.
• Ensure proper grounding and wiring according to the provided diagrams.

3. Product Overview

The PILZ PNOZ/X7/24VAC/DC safety relay is a compact device designed for reliable safety circuit monitoring. It features clear terminal markings and status indicators for easy diagnostics.

Figure 1: Front view of the PILZ PNOZ/X7/24VAC/DC Safety Relay. This image displays the yellow and green housing, with clearly labeled terminals A1, 13, 23 at the top, and A2, 14, 24, Y1, Y2 at the bottom. Two LED indicators are visible: "POWER" and "CH.1/CH.2", indicating the operational status of the relay and its channels. The model name "pilz PNOZ X7" is printed on the front.

Key features include:

• Compact 22.5mm width.
• Automatic reset function.
• 2 Normally Open (NO) safety contacts.
• LED indicators for power and channel status.
• Suitable for E-stop monitoring and safety gate applications.

4. Setup and Installation

4.1 Mounting

The PNOZ/X7/24VAC/DC is designed for DIN rail mounting. Ensure adequate ventilation around the device.

1. Mount the safety relay on a standard 35mm DIN rail in a control cabinet.
2. Ensure secure fastening to prevent vibration.

4.2 Wiring

Refer to the wiring diagram below for correct connection. All connections must comply with local electrical codes.

Figure 2: Close-up of the PILZ PNOZ/X7/24VAC/DC terminals. The top terminals are A1 (power input), 13, and 23 (safety outputs). The bottom terminals are A2 (power return), 14, 24 (safety outputs), and Y1, Y2 (feedback loop/reset). This view highlights the screw terminals for electrical connections.

• Power Supply (24VAC/DC): Connect the positive supply to terminal A1 and the negative/neutral to terminal A2.
• Input Circuit (E-Stop/Safety Gate): Connect the safety device (e.g., E-stop button) across terminals Y1 and Y2. For 1-channel wiring, ensure the circuit is closed when the safety device is active.
• Output Contacts: Terminals 13-14 and 23-24 are normally open (NO) safety contacts. Connect these to the control circuit of the machinery to be controlled.
• Feedback Loop: For automatic reset, the feedback loop (Y1-Y2) must be closed.

IMPORTANT:

Always verify wiring against the specific application requirements and the detailed wiring diagrams provided in the full product documentation from PILZ.

5. Operating Instructions

The PNOZ/X7/24VAC/DC operates with an automatic reset function. Once the safety circuit is closed and the input conditions are met, the output contacts will close automatically.

5.1 Power-Up

1. Ensure all wiring is correct and secure.
2. Apply 24VAC/DC power to terminals A1 and A2.
3. The "POWER" LED indicator will illuminate.

5.2 Normal Operation

• When the safety input (e.g., E-stop released, safety gate closed) is active, the "CH.1/CH.2" LED will illuminate.
• The safety output contacts (13-14, 23-24) will close, allowing the machine to operate.

5.3 Safety Function Activation

• If the safety input is interrupted (e.g., E-stop pressed, safety gate opened), the "CH.1/CH.2" LED will extinguish.
• The safety output contacts (13-14, 23-24) will open immediately, bringing the machine to a safe stop.

5.4 Automatic Reset

Once the safety input condition is restored (e.g., E-stop released, safety gate closed), the PNOZ/X7/24VAC/DC will automatically reset, and the output contacts will close again, provided no faults are detected.

6. Maintenance

The PILZ PNOZ/X7/24VAC/DC safety relay is designed for minimal maintenance. Regular inspections are recommended to ensure continued safe operation.

6.1 Routine Checks

• Visual Inspection: Periodically check the device for any signs of damage, discoloration, or loose connections.
• Function Test: Regularly test the entire safety circuit, including the E-stop buttons and safety gates, to ensure the safety relay correctly de-energizes the outputs.
• LED Indicators: Verify that the "POWER" and "CH.1/CH.2" LEDs illuminate and extinguish as expected during operation and safety function activation.

6.2 Cleaning

If cleaning is necessary, disconnect power and use a soft, dry cloth. Do not use abrasive cleaners or solvents.

CAUTION:

Do not attempt to open or repair the device. Refer all servicing to authorized personnel.

7. Troubleshooting

This section provides guidance for common issues. For complex problems, contact PILZ technical support.

8. Technical Specifications

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact PILZ directly or your authorized PILZ distributor. Keep your product model and part number (PNOZ/X7/24VAC/DC, 774059) available when contacting support.

PILZ Contact Information:

• Refer to the official PILZ website for the most up-to-date contact details for your region.
• Online resources and FAQs may also be available.