• Architecture: TMR‑compatible, dual redundant inputs/outputs, current sharing

• Safety: IEC 61508 SIL 3, TÜV certified

• Hot‑Swap: Online replacement without system shutdown

• Power Rating: 250 W continuousRockwell Automation

• Hold‑up Time: ≥20 ms (bridges brief input interruptions)Rockwell Automation

2. Specifications

2.1 Electrical

• Input Voltage (Redundant):

  • AC: 100–120 V AC / 200–240 V AC, 50/60 Hz

  • DC: 24 V DC (20–32 V DC range)

• Output Voltage: +24 V DC ±5 % (isolated)

• Output Power: 250 W maxRockwell Automation

• Output Current: Up to 10 A @ 24 V DCRockwell Automation

• Efficiency: >85 % at full load

• Power Factor: >0.95 (active PFC)

• Isolation: 2500 V AC (input ↔ output)

• Protection: Overvoltage, overcurrent, short‑circuit, overtemperature, reverse polarity (auto‑reset)

2.2 Environmental

• Operating Temperature: 0 °C to +60 °CRockwell Automation

• Storage Temperature: −25 °C to +70 °CRockwell Automation

• Humidity: 10–95 % RH, non‑condensingRockwell Automation

• Altitude: Up to 2000 m

• Vibration/Shock: Industrial grade (IEC 60068‑2‑6/27)

2.3 Mechanical

• Form Factor: Single‑width module for Trusted power chassis

• Dimensions (H×W×D): 266 mm × 61 mm × 318 mmRockwell Automation

• Weight: ~3.25 kgRockwell Automation

• Mounting: Slides into chassis slot guides; front latch secured

• Terminals:

  • Input: TB1/TB2 (#8 screw terminals, redundant)

  • Output: TB3/TB4 (#6 screw terminals, redundant)

  • Status: J14/J15 (dry contacts for remote alarm)

  • Monitor: J13 (serial diagnostics)

3. Installation

3.1 Chassis & Module Insertion (Hot‑Swap Enabled)

1. Install the Trusted power chassis (e.g., T8220 series) in a standard 19‑inch rack; secure mounting brackets.

2. Select an empty single‑width slot; remove the blank panel.

3. Align T8225 with chassis guides; push firmly until fully seated.

4. Secure the front latch to lock the module in place.

5. Repeat for additional modules (up to 3 per chassis for load sharing).

3.2 Wiring (Redundant Inputs/Outputs)

• Input Power (TB1/TB2): Connect redundant AC or DC sources; use 14–18 AWG stranded wire; torque terminals to 1.2 N·m.

• Output Power (TB3/TB4): Connect to system backplane and field I/O; use 12–16 AWG stranded wire; torque terminals to 1.5 N·m.

• Status Contacts (J14/J15): Wire to remote alarm panel (fault = contact closed).

• Grounding: Connect chassis PE to system earth; field ground isolated from chassis ground.

3.3 Redundancy & Load Sharing

• Install 2–3 T8225 modules in the same chassis for active‑active current sharing.

• System automatically balances load; single module failure triggers seamless switchover without downtime.

4. Front Panel Indicators

• INPUT (Green): Steady = Normal; Flashing = Input fault (loss of one redundant source)

• OUTPUT (Green): Steady = Normal; Flashing = Overvoltage/undervoltage

• CURRENT (Yellow): Bar graph = Output current level (0–100 %)

• FAULT (Red): On = Overcurrent/short‑circuit/overtemperature; Flashing = Internal fault

• OK (Green): Steady = TMR vote healthy; Flashing = Single‑channel fault

5. Operation

5.1 Normal Operation

• T8225 operates in redundant, current‑sharing mode; provides stable 24 V DC to system and field devices.

• Diagnostics continuously monitor input/output voltage, current, temperature, and internal circuits; faults are logged to the system alarm list.

5.2 Fault Tolerance & Hot‑Swap

• Single Input Fault: System runs on the remaining redundant input; INPUT LED flashes.

• Single Module Fault: Remaining modules carry full load; FAULT LED on faulty module; OK LED flashes on healthy modules.

• Hot‑Swap Replacement: Remove faulty module (unlatch, pull out); insert new module; system remains online during swap.

6. Maintenance & Troubleshooting

6.1 Routine Maintenance

• Quarterly: Inspect seating, latch tightness, and LED status; check terminal torque.

• Annually: Clean with dry, lint‑free cloth; verify grounding and cable integrity.

• Diagnostics: Use Trusted Workbench or J13 monitor port to review fault logs and module status.

6.2 Common Faults

• INPUT LED Flashing: Check redundant input sources; verify wiring and terminal torque.

• OUTPUT LED Flashing: Measure output voltage; check for overloaded/short‑circuited field wiring.

• FAULT LED On: Identify overcurrent/short‑circuit via diagnostics; disconnect field wiring and test; check for overtemperature (clean ventilation filters).

• OK LED Flashing: Single internal channel fault; replace module at next scheduled maintenance.

7. Safety & Compliance

• Install only in Trusted T8220 series power chassis; use in T8100/T8300 safety systems.

• Disconnect all power sources before wiring (except hot‑swap module replacement).

• Use shielded cables for field wiring to reduce EMI; comply with IEC 61000‑6‑2/4.

• Compliant with: CE, UL, CSA, IEC 61508 (SIL 3), TÜV certified.