HIMA F7126 Power Supply Module

Description

Core Product Summary

The HIMA F7126 is a DC/DC power supply module designed for HIMA H51q programmable electronic systems. It converts a 24 V DC primary supply into a 5 V DC output used to power the control system’s internal electronics.

The module provides a rated output current of 10 A and includes input-to-output safe isolation, current limitation, overvoltage protection, and short-circuit protection. A front-panel test socket and adjustment potentiometer support output-voltage checking and adjustment.

The F7126 occupies eight TE of rack space. It is also documented for redundant power-supply configurations, where careful output-voltage matching is required to avoid uneven load sharing.

 

Key Technical Specifications

Parameter	Specification
Manufacturer	HIMA
Model	F7126
Ordering number	F7126
Product type	Power supply module
Compatible system	HIMA H51q
Conversion type	DC/DC converter
Input voltage	24 V DC
Input voltage tolerance	−15% to +20%
Input ripple	Less than 15%
Output voltage	5 V DC, adjustable
Output adjustment range	5 V DC ± 0.5 V
Factory output adjustment	5.4 V DC ± 0.025 V
Rated output current	10 A
Current limitation	Approximately 13 A
Overvoltage protection setting	6.5 V ± 0.5 V
Primary fuse	6.3 A slow-blow
Input-to-output isolation	Safe isolation
Short-circuit protection	Output is short-circuit-proof
Efficiency	At least 77%
Electromagnetic interference classification	Class B, according to VDE 0871/0877
Rack space requirement	8 TE
Front-panel features	Test socket and output-voltage adjustment potentiometer

The factory-adjusted output voltage is listed separately from the adjustable nominal output specification. Follow the applicable HIMA manual when checking or adjusting the module.

 

Main Features and Engineering Advantages

V DC input and 5 V DC output

The F7126 converts the system’s 24 V DC supply into a regulated 5 V DC output for compatible H51q control-system electronics. This separates the primary supply interface from the internal operating-voltage requirement.

A output capacity

The module is rated for a 10 A output current. When selecting a replacement or planning a rack power budget, engineers should account for the aggregate consumption of the connected system and verify the required operating margin.

Electrical isolation

The DC/DC converter provides safe isolation between input and output voltage. This is an important design characteristic for the power architecture, but it does not eliminate the need to follow the system’s grounding, wiring, and electrical-protection requirements.

Integrated electrical protection

The documented protection functions include overvoltage protection, current limitation, and short-circuit protection. These functions help protect the power supply and connected electronics under specified fault conditions.

Front-panel voltage testing and adjustment

The module includes a test socket and a potentiometer for output-voltage adjustment. These features support maintenance checks without relying solely on measurements at downstream circuit points.

Support for redundant power arrangements

The F7126 is used in documented H51q configurations with multiple power supply modules. In redundant operation, HIMA specifies that the difference between the output voltages of redundant F7126 units must not exceed 0.025 V to avoid unbalanced loading.

System Compatibility and Integration Requirements

Before purchasing or installing the F7126, confirm the following:

• System family: Verify that the target rack belongs to a supported HIMA H51q configuration.
• Input supply: Confirm a 24 V DC supply within the specified tolerance and ripple limits.
• Output requirements: Check that the 5 V DC rail and 10 A rated capacity meet the system’s load requirements.
• Rack layout: Confirm the eight-TE space requirement and the correct installation position.
• Redundant operation: If multiple units operate in parallel or in a redundant arrangement, follow HIMA’s prescribed wiring and voltage-matching procedure.
• Protection and fuse: Verify the primary fuse specification and the site’s approved protection arrangements.
• Replacement identification: Compare the module label, order number, and hardware revision against the installed unit and system documentation.

Do not substitute a power supply simply because its nominal output voltage and current rating appear similar. Isolation, rack interface, protection behavior, and system compatibility must also match.

 

Installation and Maintenance Notes

The F7126 is a rack-mounted power supply module. Installation and servicing should follow the applicable HIMA system manual and site electrical-safety procedures.

Recommended checks include:

1. Isolate the relevant power sources and apply the site’s lockout/tagout procedure.
2. Inspect the module label and confirm the correct replacement designation.
3. Verify the 24 V DC input polarity, voltage range, and ripple conditions.
4. Check the primary fuse and inspect the module connector and rack interface.
5. After installation, measure the output voltage using the prescribed test point and procedure.
6. Verify that the connected system’s 5 V DC load remains within the module’s rating.
7. For redundant configurations, measure and match output voltages according to HIMA requirements.
8. Complete the prescribed system checks before returning the rack to service.

Do not adjust the output voltage solely to compensate for an unexplained downstream voltage drop. Investigate wiring resistance, connector condition, supply quality, and load current before changing the factory setting.

 

Detailed Product Overview

Power conversion for HIMA H51q systems

The F7126 is designed to convert a 24 V DC primary supply into a 5 V DC output for HIMA H51q system electronics. Its 10 A rated output provides a defined capacity for the system’s internal power rail.

The input accepts a specified tolerance of −15% to +20%, with input ripple below 15%. These limits are important when evaluating the suitability of the external DC supply, especially in installations where long cable runs, shared supplies, or electrical disturbances may affect input quality.

Output adjustment and monitoring

The nominal output is 5 V DC with an adjustment range of ±0.5 V. The documented factory setting is 5.4 V DC ±0.025 V. Because these specifications describe different aspects of the output adjustment, technicians should use the system-specific service procedure to determine the correct setting.

The front-panel test socket and potentiometer facilitate measurement and adjustment. Voltage checks should be made with suitable instruments and under the load conditions prescribed by the manufacturer.

Protection and fault handling

The module incorporates current limitation and overvoltage protection, and its output is specified as short-circuit-proof. The current limitation is approximately 13 A, while the overvoltage protection setting is 6.5 V ±0.5 V.

These values describe the module’s protective characteristics, not recommended continuous operating points. Persistent overload, repeated short circuits, or abnormal output voltage should trigger investigation of the connected load, wiring, and supply conditions.

Redundant power-supply operation

In H51q installations that use redundant F7126 modules, output-voltage matching is critical. HIMA specifies a maximum difference of 0.025 V between redundant units to avoid unbalanced loading.

Replacement work should therefore include the prescribed voltage measurements and verification of the redundant power arrangement. The number of power modules required depends on the particular H51q system configuration and should be checked against the appropriate assembly documentation.

 

Applications and System Role

The HIMA F7126 provides the internal 5 V DC power supply for compatible H51q programmable electronic systems.

Its primary application is powering the control-system electronics rather than directly operating field loads.

Typical system roles include:

• H51q central rack power: Supplying the required 5 V DC rail to compatible system components.
• Redundant control-system power: Supporting documented configurations that use multiple power supply modules.
• Legacy automation maintenance: Replacing an existing F7126 in a compatible rack.
• Power-system diagnostics: Providing test and adjustment access during maintenance.
• Industrial process control infrastructure: Supporting the electronics of a compatible HIMA control system.

The exact arrangement depends on the system configuration, rack assembly, connected modules, and power-distribution design.

 

Frequently Asked Questions

What is the HIMA F7126?

The F7126 is a DC/DC power supply module for compatible HIMA H51q programmable electronic systems. It converts a 24 V DC input into a 5 V DC output.

What is the output current rating?

The rated output current is 10 A. The documented current limitation is approximately 13 A; this is a protection characteristic, not the normal continuous output rating.

Is the output voltage adjustable?

Yes. The output is specified as 5 V DC ±0.5 V adjustable. The factory adjustment is listed as 5.4 V DC ±0.025 V. Use the applicable HIMA service instructions before making adjustments.

Does the F7126 support redundant power supplies?

Yes. It is documented for redundant H51q power-supply arrangements. In redundant operation, the output-voltage difference between units must not exceed 0.025 V under the manufacturer’s stated requirement.

What protection functions are included?

The module provides input-to-output safe isolation, current limitation, overvoltage protection, and short-circuit protection.

How much rack space does it require?

The F7126 requires eight TE of rack space.

What should be checked before ordering a replacement?

Confirm the F7126 designation, H51q system compatibility, 24 V DC input conditions, 5 V DC output requirement, rated current, rack position, and whether the installation uses redundant supplies.

 

Procurement Checklist

For a quotation or replacement request, prepare:

• Manufacturer: HIMA
• Model: F7126
• Product type: 24 V DC to 5 V DC power supply module
• System: H51q
• Required quantity
• Existing module label and hardware revision
• Rack and power-distribution configuration
• Whether the application uses redundant power modules
• Required condition and delivery destination

Replacement recommendation: Match the F7126 against the installed module and HIMA system documentation before purchase. For redundant installations, include output-voltage matching and system-level verification in the replacement procedure.