Product Overview

The HIMA F 7126 is a dedicated power supply module for the PES H51q automation system. This DC/DC converter takes 24 VDC input and produces stable 5 VDC output. It provides safe isolation between the input and output voltages. The F 7126 includes a test socket and potentiometer on the front plate for voltage adjustment. You get overvoltage protection, current limitation, and short circuit proof output for reliable system operation.

Technical Specifications

Input Characteristics

• Input Voltage: 24 VDC with -15% to +20% tolerance.

• Input Ripple: Maximum rpp less than 15%.

• Primary Fuse: 6.3 A slow-blow (träge) type.

• Interference Class: Limit class B per VDE 0871/0877.

Output Characteristics

• Output Voltage: 5 VDC ± 0.5 V adjustable without steps.

• Factory Adjustment: 5.4 VDC ± 0.025 V.

• Output Current: 10 A continuous rating.

• Current Limitation: Approximately 13 A trip point.

• Overvoltage Protection: Set to 6.5 V ± 0.5 V.

• Short Circuit Protection: Output is short circuit proof.

• Efficiency Rate: 77% or higher under normal load.

Redundant Operation Requirements

• Redundant Use: Supported with two F 7126 modules.

• Voltage Matching: Output voltage difference must not exceed 0.025 V.

• Purpose: Prevents unbalanced load between redundant supplies.

Front Panel Features

• Test Socket: For measuring output voltage during operation.

• Potentiometer: Allows stepless output voltage adjustment.

• Access: Both features located on the front plate for easy access.

Electrical Isolation

• Isolation Type: DC/DC converter with safe isolation.

• Isolation Location: Between input voltage and output voltage.

• Safety Rating: Meets requirements for automation system power.

Physical Characteristics

• Space Requirement: 8 TE (Telephone unit width).

• Construction: Standard European format module.

• Cooling: Convection cooled, no fan required.

Installation Guide

Follow these steps to install the HIMA F 7126 correctly. First, verify your 24 VDC supply falls within -15% to +20% tolerance. Second, install the 6.3 A slow-blow primary fuse in the input circuit. Third, insert the module into an 8 TE wide slot in your H51q rack. Fourth, connect the 5 VDC output to your automation system backplane. Fifth, for redundant operation, match both output voltages within 0.025 V difference. Sixth, use the test socket to measure the output voltage. Finally, adjust the potentiometer if you need a different output voltage between 4.5 V and 5.5 V.

Package Contents

• 1 x HIMA F 7126 power supply module.

• 1 x Front plate with test socket and potentiometer.

• 1 x Connector set for input and output wiring.

• Note: Primary fuse (6.3 A slow-blow) not included.

• Note: No mounting screws or backplane connectors included.

Frequently Asked Questions (FAQ)

Q1: What is the factory-adjusted output voltage on the HIMA F 7126?
A: The F 7126 comes factory adjusted to 5.4 VDC ± 0.025 V. You can adjust this value using the front panel potentiometer. The adjustable range goes from 4.5 VDC to 5.5 VDC without steps.

Q2: Can I use two HIMA F 7126 modules in a redundant configuration?
A: Yes, redundant operation is fully supported for high availability systems. The output voltage difference between the two modules must stay at or below 0.025 V. This prevents unbalanced load and ensures proper current sharing.

Q3: What happens when the output current exceeds 10 A on this power supply?
A: The current limitation activates at approximately 13 A. This protects the module and your connected equipment from damage. The output is also short circuit proof for additional safety during wiring faults.

Q4: How do I check the output voltage without removing the HIMA F 7126 from the rack?
A: Use the test socket located on the front plate of the module. This socket gives you direct access to measure the output voltage. You can then adjust the potentiometer while monitoring the test socket.

Q5: What is the efficiency rating of the HIMA F 7126 power supply module?
A: The efficiency rate reaches 77% or higher under normal operating conditions. This means minimal power loss as heat. The module does not require forced air cooling in most standard installations.