Invensys Triconex 3603E 16-Ch DO 120VDC TMR

Product Overview

The 3603E is a 120 VDC TMR digital output module manufactured by Invensys Triconex for the Tricon safety instrumented system. It provides 16 commoned output channels with supervised loopback verification, driving solenoid valves, motor contactors, and safety relays in critical process control applications. The module's quadruplicated voter circuitry processes output commands from three redundant main processors, producing a single voted output signal that ensures safe state execution even under single or multiple fault conditions.

Key Specifications

• System: Invensys Triconex Tricon SIS
• Type: TMR Supervised Digital Output
• Channels: 16 outputs, commoned
• Nominal Voltage: 120 VDC
• Voltage Range: 90–150 VDC
• Maximum Voltage: 160 VDC
• Voltage Drop: < 1.5 VDC typical
• Current Rating: 0.8 A per point, 4 A surge per 10 ms
• Minimum Required Load: 30 mA
• Load Leakage: 4 mA maximum
• Fuses (Field Termination): 1 A fast-acting per output
• Point Isolation: 1500 VDC / 2500 VDC
• Power Module Load: < 10 watts
• Diagnostic Indicators: PASS, FAULT, ACTIVE, LOAD/FUSE per point

Features & Benefits

1. TMR Supervised Outputs: Each output is voted by quadruplicated circuitry and verified by voltage loopback, detecting latent faults independent of load presence.
2. High-Voltage DC Drive: 120 VDC output drives large solenoids and contactor coils directly without interposing relays in safety shutdown loops.
3. Surge Current Capability: 4 A surge per 10 ms handles inductive inrush currents from solenoid valves and motor starters.
4. Per-Point Diagnostics: Individual ON/OFF state LEDs plus PASS/FAULT/ACTIVE module status provide at-a-glance troubleshooting.
5. Hot-Spare Compatible: Supports online replacement of a faulty module without process interruption when paired with a spare.

FAQ

Q: What is the difference between 3603E and 3603B?
A: The 3603E provides 16 non-commoned outputs. The 3603B provides 16 commoned outputs with a shared return path. Verify your field wiring topology before selecting.

Q: Does the 3603E require external fuses?
A: Yes, a 1 A fast-acting fuse is required per output channel on the external termination panel (ETP) to protect the module and field wiring.

Q: What happens if the load current falls below 30 mA?
A> The module requires a minimum 30 mA load for proper loopback verification. Below this threshold, the LOAD/FUSE diagnostic may activate.

Installation Guide

• Install the module into a Tricon digital output slot in the chassis.
• Connect 120 VDC field power to the external termination panel (ETP).
• Wire each output channel to the corresponding solenoid, contactor, or relay coil.
• Install 1 A fast-acting fuses on each ETP output circuit.
• Install freewheeling diodes across inductive loads to suppress voltage spikes.
• Verify output operation and loopback diagnostics via the TriStation 1131 diagnostic display.

Selection Tips

• Voltage Matching: The 3603E is rated for 120 VDC. For 24 VDC outputs, select the 3604E. For 115 VAC outputs, select the 3601E.
• Load Current: Verify each solenoid or contactor coil draws at least 30 mA at 120 VDC. For lower current loads, add a bleeder resistor.
• Inductive Suppression: Always install freewheeling diodes or MOV suppressors across DC inductive loads to protect the output switches.
• ETP Compatibility: Ensure the external termination panel supports 120 VDC fused outputs and is keyed for the 3603E module type.