HIMA F7126 Isolated DC‑DC Power Supply Module

Module Feature

F7126 is HIMA rack‑type isolated DC‑DC power‑supply module, specially designed for HIMA H41q / H51q safety instrumented SIS rack chassis. It converts 24 VDC system input power into stable, galvanically‑isolated 5 VDC logic power for rack internal safety CPU and I/O boards. Supports redundant parallel operation; front‑panel potentiometer allows fine‑tune output voltage; built‑in comprehensive hardware protections: over‑voltage protection, current limiting, short‑circuit withstand. Widely used in petrochemical SIS / ESD safety shutdown systems, complies with safety‑related rack hardware requirements, can be configured hot‑standby redundant power architecture.

Working principle

Input 24 VDC feeds internal isolated DC‑DC conversion circuit. Galvanic isolation separates primary‑side field power and secondary‑side safety logic power, suppress ground‑loop interference. Output voltage is regulated; current‑limit and over‑voltage hardware circuits act immediately upon abnormal load conditions to protect downstream safety‑related boards. Multiple F7126 modules can run in parallel for redundant power feeding to improve system availability.

Onboard components

Isolated DC‑DC transformer circuit, output voltage adjustment potentiometer, over‑voltage protection circuit, current‑limiting circuit, short‑circuit protection hardware, front‑panel test socket, rack back‑plane golden‑finger connector, metal‑shielded 8‑TE Eurocard PCB assembly.

LED indicators

Front‑panel status LED; lights when output power is normal; extinguish or flash under fault conditions (over‑voltage, overload, short‑circuit).

Hardware self‑diagnosis

Hardware automatic trigger protection under over‑voltage, overload, short‑circuit. Module fault status is reported to HIMA safety CPU via rack back‑plane; fault information can be read by HIMA engineering software. Output voltage can be measured via front‑panel test socket for manual verification.

Programming software

No dedicated configuration software. Redundant‑system parameter settings are completed within HIMA safety logic engineering tool; module itself is pure hardware power‑conversion unit.

Electrical & Process Parameters

Model:F7126 Brand:HIMA Device type:Isolated DC‑DC Power‑Supply Module Input:18‑36 VDC (nominal 24 VDC) Output:5 VDC (continuously adjustable, factory preset 5.4 VDC) Rated output current:10 A Current limit:≈13 A Over‑voltage protection threshold:6.5 VDC Isolation:Galvanic isolation between input and output Dimension:8 TE Eurocard rack format Function:Provide isolated 5 VDC logic power for HIMA H41q / H51q SIS safety rack

Mechanical & Structure

Mounting:Insert into HIMA standard Eurocard safety rack slot Protection class:IP20 (inside rack cabinet) Housing:Metal‑shielded Eurocard module

Environmental

Operating temperature:-25℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:Compliant with IEC 61508‑related safety‑system hardware requirements Status:Original HIMA safety‑rack power‑supply spare module

Installation

Insert F7126 module into HIMA H41q / H51q rack slot. Confirm 24 VDC input power is normal. Fine‑tune output voltage via front‑panel potentiometer, measure at test socket to match rack specification. For redundant configuration, ensure output‑voltage deviation between parallel modules ≤0.025 V. Verify rack CPU and I/O boards power‑on normally.

Interface

Rack back‑plane golden‑finger connector; front‑panel test‑measurement socket.

Diagnostic

No output:24 VDC input missing or internal primary fuse blown. Output collapse under load:Over‑current / short‑circuit trigger current‑limit protection. Redundant‑system unbalanced load:Output‑voltage difference between parallel modules exceeds 0.025 V, re‑adjust potentiometer. LED off:Module internal hardware failure, replace spare module.

Product Brief

HIMA F7126 isolated DC‑DC power‑supply module, converts 24 VDC to regulated 5 VDC, supplies logic power for HIMA H41q / H51q SIS safety rack, supports redundant parallel operation with full over‑voltage, over‑current and short‑circuit hardware protection.