Description

Phoenix QUINT-DIODE/12-24DC/2x20/1x40

I. Product Overview

Model: QUINT-DIODE/12-24DC/2x20/1x40
Version: Standard Version
Global Part Number: 2320157
Product Series: Phoenix Contact QUINT Series Industrial Diode Redundancy Module
Product Category: DC-DC Diode Redundancy Module (for parallel redundancy / capacity expansion of power supplies to achieve bumpless switching)
Country of Origin: Germany

Core Functions

This device is a core diode redundancy module in the Phoenix Contact QUINT series, designed for high-reliability redundant power supply in industrial power systems.

It mainly provides isolation, redundant switching and load distribution after paralleling the outputs of two identical power supplies, effectively improving the operational reliability of the entire power supply system.

Built with two high-capacity diodes, it supports flexible switching between two operating modes:

Redundancy mode: Connect two 20 A rated power supplies to achieve bumpless switching. If one power supply fails or mains power is interrupted, the other automatically takes over the full load to prevent system shutdown.
Capacity expansion mode: Parallel two power supplies to provide a single 40 A rated output to meet high-load power demands.

The module features a low voltage drop of 0.5 V and efficiency of over 97%.

It has built-in varistors for transient surge protection and supports reverse polarity protection (withstand voltage < 60 V), requiring no additional protective components.

It uses DIN rail clip mounting, compatible with standard industrial control cabinet layouts, and can seamlessly integrate with QUINT series power supplies.

It supports series connection of DC-OK relay contacts for redundant status monitoring, meeting continuous power supply requirements in harsh industrial environments.

Application Scenarios

Widely used in fields with extremely high power supply reliability requirements, such as automotive manufacturing, metallurgy, petrochemical, power, rail transit, water treatment and automated production lines.

Suitable for QUINT series and equivalent industrial DC power supplies, used in redundant power supply systems for critical loads including PLC, DCS, remote I/O, HMI, servo drives and solenoid valves.

Especially ideal for critical control systems requiring 24/7 continuous operation, such as emergency stop circuits, safety PLC systems, data center UPS outputs, offshore platform power supply, and potentially explosive areas (compliant with EN 50021 for Zone 2 hazardous environments).

It enables power supply parallel redundancy or capacity expansion to ensure uninterrupted system power if one power supply fails, greatly improving the availability and stability of industrial automation systems.

II. Technical Specifications

Parameter Category	Details
Electrical Specifications	Input/output voltage: Rated 12–24 VDC, operating range 10–30 VDC Rated current: Redundancy mode 2×20 A (-25℃～60℃); Expansion mode 1×40 A (-25℃～60℃) Max. current: 2×30 A (-25℃～40℃); 1×60 A (-25℃～40℃) Voltage drop: ≤ 0.5 V between input and output Protection: Built-in varistor for transient surge protection; reverse polarity protection (withstand < 60 V) Efficiency: ≥ 97% at rated load Power loss: Max. 10 W at rated load (20 A output) Monitoring: Supports series connection of DC-OK relay contacts for redundant status monitoring
Physical Specifications	Mounting: Standard NS 35 DIN rail, compact size, matching QUINT series power supply layout Net weight: approx. 0.5 kg (subject to original factory specifications) Protection degree: IP20 (must be installed in a control cabinet) Mounting method: DIN 35 rail clip mounting, no auxiliary screws required; exposed terminals for easy wiring and maintenance
Environmental Adaptability	Operating temperature: -25℃ to +70℃ (derated by 2.5%/K from 60℃ to 70℃) Storage temperature: -40℃ to +85℃ Relative humidity: 5%–95% (non-condensing) Immunity / Surge: Complies with industrial EMC standards, built-in transient surge suppression devices Compliance: EN 50021 for potentially explosive areas (Zone 2); RoHS compliant

III. Installation and Maintenance Guide

Pre-installation Requirements

Anti-static: Wear a grounded anti-static wristband before operation. Do not touch terminals or internal electronic components with bare hands. Keep the module in an anti-static bag until installation to avoid electrostatic damage.
Environment: Install in a dust-free, non-condensing, well-ventilated control cabinet, away from strong interference/heat sources such as inverters, high-voltage cables and high-power thyristors. Equip the cabinet with fans or air conditioning to maintain -25℃～+70℃. Prevent direct contact with dust, oil mist or condensation, especially in Zone 2 hazardous areas.
Wiring rules: Strictly distinguish power input, output and ground terminals according to markings. Use two identical power supplies with consistent output voltages. Route power and signal cables in separate ducts; ground terminals must be securely connected to the system ground busbar. In redundancy mode, connect each power supply to the corresponding module input; in expansion mode, wire correctly. Reverse connection or short circuit is prohibited. Wire DC-OK relay contacts in series per manual to ensure proper monitoring.
Parameter setup: After installation, confirm the operating mode (redundancy/expansion) matches the wiring. Check output voltage consistency of the two parallel power supplies. Verify no short circuits or reversed wiring before power-on. Test redundant switching to ensure bumpless transfer under fault conditions.

Routine Inspection

Indicator lights: Observe the module status indicator (if equipped); steady on during normal operation, abnormal in case of fault (per factory labeling). Monitor DC-OK signals to confirm normal redundant system status without alarms.
Temperature and ventilation: Ensure the module housing is not abnormally hot. Keep cabinet filters clean and fans quiet. Maintain unobstructed heat dissipation, especially under high load, to avoid exceeding derating temperature limits.
Wiring and terminals: Inspect input/output terminals and ground screws for looseness, oxidation or burning. Check cables for aging or cracking; ensure tight connections and even current distribution between the two power supplies.
Operating parameters: Measure input/output voltage with a multimeter to confirm voltage drop within 0.5 V. Monitor load current: in redundancy mode, keep each power supply within rated current; in expansion mode, total load ≤ 40 A to avoid overload.

Periodic Maintenance

Every 6 months: Clean cabinet filters and dust on the module; retighten all terminals; test redundant switching by simulating one power supply fault to verify bumpless takeover; check DC-OK monitoring function.
Annually: Measure voltage drop, efficiency and insulation performance with professional instruments; inspect internal diodes for aging or damage; back up redundant system configuration; verify grounding reliability and optimize wiring; establish maintenance records.
Every 2 years: Fully test surge suppression and reverse polarity protection; assess module aging and diode conduction performance; evaluate replacement cycles for units in high-dust, corrosive or hazardous environments; confirm compatibility with parallel power supplies and perform firmware updates if supported and needed.

IV. Common Faults and Troubleshooting

Fault Symptom	Possible Causes	Troubleshooting & Solutions
No module output, load power failure	1. Both parallel power supplies faulty or without input 2. Reversed, shorted or loose wiring 3. Internal diode damage 4. Reverse polarity protection triggered	1. Check input and status of both power supplies and restore power 2. Verify wiring, retighten terminals, eliminate short circuits and reversed connections 3. Power off, test diode continuity; replace module if defective 4. Check polarity, correct wiring and restart
Abnormal redundant switching, load shutdown on fault	1. Mismatched output voltages of two power supplies 2. Incorrect operating mode configuration 3. Wrong DC-OK monitoring wiring 4. Internal switching circuit failure	1. Adjust output voltages for consistency 2. Confirm mode (redundancy/expansion) matches wiring and reconfigure 3. Check and correct DC-OK series wiring 4. Return module for factory inspection and repair if other issues are ruled out
Excessive module heating and power loss	1. High ambient temperature or poor ventilation 2. Load current exceeds rating 3. Abnormally increased voltage drop 4. Internal diode aging	1. Improve cabinet cooling and clear heat ducts 2. Reduce load to within rated current 3. Measure voltage drop; check wiring or replace module if >0.5 V 4. Test diodes and replace module if aged
Abnormal or false DC-OK alarm	1. Loose or incorrect DC-OK wiring 2. DC-OK signal fault of parallel power supplies 3. Internal monitoring circuit failure	1. Tighten DC-OK wiring and verify connection per manual 2. Check DC-OK signals of both power supplies 3. Return module for factory repair if other causes are eliminated