Why is 19.2–36 VDC unsuitable as a normal target for 8311?

The original guide marks this as an extended range for short periods; use the recommended 24 VDC tolerance in normal service.

How is source capacity assessed for 8311?

Check each source can provide the stated 240 W minimum under the configured chassis load.

Where is ambient measured for 8311 output ratings?

The 27 A and 175 W values apply at 60°C air temperature measured at the bottom of the chassis.

What should be checked if 8311 drops out during load changes?

Measure supply transient voltage at the module, inspect wiring losses and source response, and compare with the minimum input limit.

Why does 8311 use a time-delay input fuse?

The published table specifies 15 A time-delay protection; match the installed fuse type to manage normal input transients.

How is a redundant 8311 arrangement accepted?

Check both power sources independently and confirm controller diagnostics remain stable under the approved failover procedure.

Can a different Tricon power module replace 8311?

Only after input voltage, output capacity, chassis slot and controller compatibility are approved.

What data should be recorded after 8311 service?

Record input voltage, output indication, fuse identity, chassis temperature and diagnostic status.

8311

Name: 8311
Brand: Invensys
SKU: 8311

Tricon 24 VDC Power Module

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

Triconex 8311 is a 24 VDC input power module for the Tricon controller chassis. It converts the external dc supply into a regulated 6.5 VDC logic output for the controller assembly.

Manufacturer part number

8311
Shipping

Swift global dispatch
Condition

New, original product
Shipping size (est.)

3cm × 30.2cm × 26.5cm
Country of Origin

USA

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What happens after you enquire

0

Review your reference

Send the complete 8311 marking, quantity and current label photos. We will review the exact power module and installed Tricon system configuration.
1

Confirm the offer

Check the quoted reference, condition, included items and expected dispatch date before approving your order.
2

Arrange dispatch

Confirm the delivery address and receive the tracking reference when the shipment is arranged.

Match the complete marking

Include 8311 and any visible revision or assembly number on the item. Keep the exact reference on the enquiry and quotation.
Check the offered item before ordering

Request current label, connector and board photos. Compare the offered power module with the installed Tricon chassis, system design and approved maintenance record.

Technical specifications for 8311

Manufacturer:

Invensys
Product Category:

PLC Systems
Spare Part Number:

8311
Weight:

1.2 kg
Tariff Code:

8537101190
Nominal input:

24 V DC
Recommended input:

24 V DC, -15% / +20%
Extended input:

19.2–36 V DC, short-term
Input isolation:

1000 V AC / 1500 V DC
Source capacity:

240 W minimum per source
Input fuse:

15 A time-delay
Output voltage:

6.5 V DC ±1%
Maximum output current:

27 A at 60°C chassis-bottom ambient
Output power:

175 W at 60°C chassis-bottom ambient
Steady input current:

5 A typical / 10 A maximum
Input overvoltage clamp:

40 V DC

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Information

Overview Downloads Applications / Compatibility Product Precautions

The preferred input remains within 24 VDC -15% to +20%. The wider 19.2–36 VDC range is an extended, short-term operating condition and should not be treated as the normal cabinet supply setting.

Input: 24 VDC nominal supply
Output: Regulated 6.5 VDC logic rail
Capacity review: Per-source power and chassis temperature

The preferred input remains within 24 VDC -15% to +20%. The wider 19.2–36 VDC range is an extended, short-term operating condition and should not be treated as the normal cabinet supply setting.

Each source needs at least 240 W capacity. The module output is 6.5 VDC ±1%, with a published maximum of 27 A and 175 W at a 60°C ambient measured at the bottom of the chassis. This rating must be assessed against the fitted controller load.

A redundant power arrangement can support controlled module replacement only under the approved Tricon site procedure. Before service, document both source voltages, fuse types, load distribution and temperature, then verify the restored supply and diagnostics.

Controller platform reference: Tricon controller power architecture. Match the installed configuration and interfaces.

Technical downloads for Triconex 8311: an Apter Power technical reference and an installation and commissioning guide.

These Apter Power documents support product identification and service planning. Apply the approved system and site procedures during installation.

Input: 24 VDC nominal supply

Capacity review: Per-source power and chassis temperature

Tricon chassis power

Provide logic power for a controller chassis with the documented 24 VDC power architecture.
Redundant supply design

Review both source capacities and the controller load before planning an online module exchange.
Legacy cabinet maintenance

Match the exact 8311 module and its input-fuse arrangement to the installed chassis.
Load growth review

Compare the configured module population with the 6.5 VDC output current limit at the cabinet temperature.

Installation and commissioning checks for Triconex 8311.

Measure both dc feeds

Confirm normal input voltage at each source.

Check source capacity

Verify at least 240 W is available per source.

Confirm fuse type

Use the specified 15 A time-delay input protection.

Review load and heat

Check chassis-bottom ambient against the output rating.

Observe redundancy procedure

Use the site-approved isolation sequence.

Validate diagnostics

Confirm regulated output and supply status after service.

Alternative Names

Triconex 8311

Technical notes

Normal supply: Keep each source within the recommended 24 VDC tolerance.

Thermal rating: Apply the 27 A / 175 W output limit at 60°C chassis-bottom ambient.

Redundancy: Prove both supplies under the approved controller procedure.

FAQ View All FAQ

Why is 19.2–36 VDC unsuitable as a normal target for 8311?

The original guide marks this as an extended range for short periods; use the recommended 24 VDC tolerance in normal service.
How is source capacity assessed for 8311?

Check each source can provide the stated 240 W minimum under the configured chassis load.
Where is ambient measured for 8311 output ratings?

The 27 A and 175 W values apply at 60°C air temperature measured at the bottom of the chassis.
What should be checked if 8311 drops out during load changes?

Measure supply transient voltage at the module, inspect wiring losses and source response, and compare with the minimum input limit.

Why does 8311 use a time-delay input fuse?

The published table specifies 15 A time-delay protection; match the installed fuse type to manage normal input transients.
How is a redundant 8311 arrangement accepted?

Check both power sources independently and confirm controller diagnostics remain stable under the approved failover procedure.
Can a different Tricon power module replace 8311?

Only after input voltage, output capacity, chassis slot and controller compatibility are approved.
What data should be recorded after 8311 service?

Record input voltage, output indication, fuse identity, chassis temperature and diagnostic status.

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