Description

PAT DS 120 2002 Installation Manual – Factory Specs for Programmable Switching Amplifier

I’ve seen too many load indicator installations go sideways because someone used a photocopied set of instructions from the internet. The DS 120 is a programmable switching amplifier that controls overload systems on cranes and hoists. Get the wiring wrong, and you’re looking at a dropped load. That’s not an oops moment. That’s a fatality waiting to happen. The PAT DS 120 2002 Installation Manual is the only document you should trust for setting up this unit. It’s 85 pages of German engineering, written by the engineers who built the box. Not some third-party translator guessing at pinouts.

85 Pages of Factory-Validated Data

The complete manual covers every subsystem that touches a DS 120. From the basic schematic (page 1) to the list of hardware components – analog signal inputs, relay outputs, digital control inputs, and the RS422/RS485 interface modules. Each section is cross-referenced to the actual PCB layout. If you need to trace a signal path, the block diagram is right there. No blurry scans. No missing pages. Just clean, original OEM artwork from 2002.

Switching Point Configuration: What the Manual Covers

Setting switching points is where most aftermarket documents fall apart. This manual uses an overload control unit as the example walkthrough. You get the exact procedure for defining limit values – constant, variable, and dynamic types. The hysteresis, delay-off, delay-on, and relay release are all explained in the “Analog Input” and “Switching points” modules. Each dialog box is shown with field-by-field instructions. If you’ve ever fought a ghost trigger on a crane load cell, you will appreciate the filter functions and cable short-circuit detection detailed here.

Does This Manual Cover Analog Input Setup?

Yes, and it goes deeper than most techs expect. The “Analog Signal Inputs” section walks you through sensor type selection, curve correction, transformer matching, and the actual variable scaling. There’s a separate configuration for the analog output – D/A alignment, DAC type, minimum/maximum output values, and curve correction (also see page 45 for the curve module). Each step includes the factory default values and the acceptable range. No assumptions. No “set it to whatever feels right.”

Safety Warnings and Intended Use

The manual opens with a full set of safety instructions. Warning information, symbols, intended use definitions, and requirements for operating personnel. PAT GmbH makes it clear: the user takes full responsibility for any changes made via the software. The DS 120 can be supplied calibrated from the factory – the manual tells you exactly what parameters can be adjusted on-site and what requires a factory re-calibration. Ignore these warnings, and you void the warranty and your liability coverage. That’s not hyperbole. That’s printed on page 3.

How to Use the DS 120 Software Dialog Boxes

The software operation section covers every menu item. “File” menu: new, open, close, save, print, check data record, quit. “Basic Adjustments” menu: communication dialog (interface selection, online mode), information dialog (access code, data type, checksum, dongle SN), general dialog (process data online, relay release in calibration mode). If you have ever stared at a Configuration Manager screen wondering what “Checksum” means, this manual explains it. The programming of basic functions is broken down into modules – Analog Input, Switching Points, Calculation, Relay, and the enhanced functions like Curve, LC-Display, Switch, Snagload, Lifetime Counter, RS422, and RS485. Each module has its own dialog box walkthrough.

3 Reasons This Manual Belongs in Your Shop

1. OEM source – Published by PAT GmbH in 2002, revision 1.30/1.31. Not a third-party reprint.
2. Safety-critical detail – The manual doesn’t assume you already know the machine. It defines intended use, operator qualifications, and proper calibration procedures.
3. Complete I/O coverage – Analog inputs, digital control inputs, relay outputs, and optional communication modules are all diagrammed and explained.

For crane and hoist installers, this is the difference between a pass and a fail on the load test. If you need related equipment manuals, check these factory documents:

• PAT America DS 350, 1334 2002 Operators Manual – Factory Specs
• PAT America DS 350, 1334 2001 Operators Manual – OEM Specs
• PAT America EI65 2002 Operators Manual – Factory Load Indicator Specs

External reference – understanding load cell signal conditioning is similar to understanding the principles of a Manual Transmission in terms of mechanical force transfer. Also see Manual Transmission for gear ratio basics, though that’s a different discipline.

Is this manual a reprint or a copy?

No. It is the original OEM file from PAT GmbH, scanned and verified against the 2002 edition. No third-party alterations.

Does it cover the optional LC-Display module?

Yes. The “LC-Display” module is covered in the Enhanced Functions section. It includes configuration of number of parameters, format, offset positioning, and text line editing. The manual shows exactly how to map parameters to the display after the DS 120 is programmed.

Can I use this manual for the DS 350?

No. The DS 350 has different analog input ranges and relay configurations. PAT released separate manuals for each model. See the related DS 350 manuals listed above.

What if the manual does not include a specific torque value?

The DS 120 is an electronic device, not a mechanical assembly. Torque specs are not applicable. Instead, the manual provides electrical specifications – voltage ranges, current limits, and cable cross-section requirements for the terminal blocks.

Every DS 120 installation should start with the factory instructions. The wiring diagrams, software dialog box screenshots, and step-by-step configuration procedures are what you need to get the system running without guesswork. Access the Factory Manual from AutoRepairManuals today.