Pilz PNOZ XV3P safety relay

Pilz PNOZ XV3P safety relay: complete manual for selection, delay configuration, and on-site troubleshooting

In the safety control of industrial machinery, equipment such as emergency stop buttons, protective door switches, and gratings need to reliably cut off hazardous sources. However, many applications not only require immediate disconnection of the main circuit, but also require cutting off auxiliary actuators (such as brakes, pressure relief valves, or auxiliary contactors) after a specific delay. Pilz's PNOZ XV3P safety relay is designed for such scenarios: it integrates 3 instantaneous safety normally open contacts and 2 delayed disconnection safety normally open contacts, while supporting single/dual channel input, automatic/monitored start, and cross short circuit detection. This article is based on the PNOZ XV3P operation manual (version 20122-EN-09), which systematically introduces the selection points, wiring specifications, delay setting methods, safety characteristic data, and the most commonly encountered fault diagnosis and troubleshooting processes on site for multiple models in this series. Whether you are integrating this relay for the first time or troubleshooting an unknown fault on an old production line, this article will provide hands-on technical guidance.

Product Overview and Model Selection

2.1 Core Functions

PNOZ XV3P is a safety relay with delayed disconnection function, which complies with EN 60947-5-1 and EN 60204-1. Its typical applications include:

Emergency stop monitoring (E-STOP)

Safety door switch (with or without cross short circuit detection)

Grating/safety switch

Key output configuration:

Instantaneous safety contacts: 3 normally open (13-14, 23-24, 33-34), open immediately after the input circuit is disconnected.

Delay safety contact: Two normally open channels (47-48, 57-58) will only open after the set delay time (tv) has ended.

No auxiliary contact (N/C) output.

Operation mode:

Single channel (no redundancy, but can detect ground faults)

Dual channel with cross short circuit detection (highest safety level)

Dual channel without cross short circuit detection

Startup method:

Auto start (activated when input circuit is closed)

Monitored startup (requires additional closure of the startup circuit, such as pressing the reset button)

2.2 Model Overview and Selection Suggestions

PNOZ XV3P offers multiple delay ranges, fixed or adjustable delays, as well as screw terminal or spring terminal versions. The main order numbers are as follows:

Order number Power delay type Terminal type Delay range Typical application scenarios

777514 24V DC fixing screw, 0.5 second rapid braking control

777512 24V DC adjustable (knob) screw 0~3 s (12 gears) universal short delay

777510 24V DC adjustable (knob) screw with 0~30 s (12 gears) delayed exhaust or pressure relief

777517 24V DC fixing screw with 10 seconds medium delay

777518 24V DC adjustable (knob) screw 0~300 s (12 gears) long delay cooling or shutdown process

787512 24V DC adjustable (knob) spring loading 0~3 s anti vibration occasions

787510 24V DC adjustable (knob) spring loading 0~30 s anti vibration delay

787518 24V DC adjustable (knob) spring loading 0~300 s anti vibration long delay

Selection criteria:

Delay accuracy: The adjustable version has a delay accuracy of -15%/+15%+50ms and a repetition accuracy of 2%. For situations with strict time requirements (such as robot collaborative stopping), it is recommended to prioritize the adjustable version and conduct actual testing and verification.

Terminal type: In high vibration environments such as ships and construction machinery, it is recommended to use spring terminals (models with the suffix "C", such as 787512), which have better vibration resistance than screw terminals.

Fixed special values: If precise 0.5s or 10s are required and on-site personnel do not want to make incorrect adjustments, fixed delay models (777514, 777517) can be selected.

Detailed explanation of functional principles and operating modes

3.1 Internal Logic and Terminal Definition

Refer to the block diagram (page 9 of the manual), the key terminals are as follows:

Terminal group symbol function

Power supply A1, A2 24V DC (A1 positive, A2 negative)

Input circuit S11, S12, S21, S22, S31, S32 emergency stop or safety door signal input. When using dual channels, S11-S12 and S21-S22 need to be used in pairs (with cross short circuit detection, S31-S32 assistance is required).

Start circuits S13 and S14 are used for monitored startup (if automatic startup is used, S13-S14 must be short circuited)

Feedback loops Y39 and Y40 are used to monitor external contactors or expansion modules to ensure that they actually open after the safety contacts are disconnected

The delay setting front panel knob is only available in adjustable versions and is used to set the delay TV (selected by scale)

Instantaneous outputs 13-14, 23-24, 33-34 immediately disconnect

Delay output 47-48, 57-58 delay disconnect

3.2 Workflow

Power on: POWER LED lights up.

Waiting ready: Start circuits S13-S14 are closed (if using monitored start, an additional 300ms of waiting time is required before closing the start circuit). During automatic startup, S13-S14 will be permanently short circuited.