
DOC-0017-04-EN: AC20 Series - Hardware Installation Manual 
8 (154) DOC-0017-04-EN-A 22.03.2023 
7.4 Dynamic Braking Resistor......................................................................................................... 63 
 Resistor Power Requirement Calculation.................................................................................................... 63 
 Resistor Selection....................................................................................................................................... 63 
 Resistor Protection Devices........................................................................................................................ 64 
7.5 AC Motor Choke........................................................................................................................ 65 
 1ø, 230V Products ...................................................................................................................................... 65 
 3ø, 230V Products ...................................................................................................................................... 66 
 3ø, 400V Products ...................................................................................................................................... 66 
 Calculation.................................................................................................................................................. 67 
8Safe Torque Off (STO): SIL2, PLd.................................................................................................... 68 
8.1 Overview ................................................................................................................................... 68 
 Introduction................................................................................................................................................. 68 
 STO Functional Description ........................................................................................................................ 69 
8.2 Alignment to European Standards ............................................................................................ 69 
 EN ISO13849-1:2015 (Safety of machinery – Safety-related parts of control systems) ............................... 69 
 EN61800-5-2:2017 (Adjustable speed electrical power drive systems) & EN61508:2010 (Functional safety of 
electrical/electronic/programmable electronic safety-related systems) ........................................................................ 70 
8.3 Specification .............................................................................................................................. 70 
 Safety ......................................................................................................................................................... 70 
 EMC ........................................................................................................................................................... 71 
8.4 STO Operation .......................................................................................................................... 71 
 Terminal Identifications ............................................................................................................................... 71 
 Input State Truth Table ............................................................................................................................... 72 
 Example Applications ................................................................................................................................. 72 
 Technical Specification ............................................................................................................................... 77 
8.5 STO Safety Warnings & Limitations.......................................................................................... 77 
8.6 STO Functional Checks ............................................................................................................ 79 
 Comprehensive Checks.............................................................................................................................. 80 
 Test Protocol Specimen.............................................................................................................................. 82 
 Regular Checks .......................................................................................................................................... 82 
8.7 STO Troubleshooting ................................................................................................................ 83 
9Basic Drive Operation....................................................................................................................... 84 
9.1 ‘Local’ Operation ....................................................................................................................... 84 
 Minimum Connections ................................................................................................................................ 84 
 Onboard Drive Keypad & Display Overview................................................................................................ 85 
 6901 Remote Keypad & Display Overview.................................................................................................. 87 
 Keypad Menu Navigation Examples ........................................................................................................... 89 
 Basic Drive Setup ....................................................................................................................................... 90 
9.2 ‘Remote’ Operation (Using Pre-Defined Macro’s)..................................................................... 98 
 Enable ‘Remote’ Control Mode ................................................................................................................... 98 
 Selecting & Loading A Macro...................................................................................................................... 98 
 Running The Drive...................................................................................................................................... 99 
 Application ‘1’: Standard (Basic Speed Control)........................................................................................ 100 
 Application ‘2’: Auto / Manual.................................................................................................................... 101 
 Application ‘3’: Presets.............................................................................................................................. 102 
 Application ‘4’: Raise / Lower .................................................................................................................... 103 
 Application ‘5’: PID.................................................................................................................................... 104 
 Application ‘6’: Aux Comms ...................................................................................................................... 105 
9.3 External +24V Power-Up Mode .............................................................................................. 106 
 24V Active Functionality............................................................................................................................ 106 
10 Routine Maintenance & Repair ...................................................................................................... 107 
10.1 Routine Maintenance .............................................................................................................. 107 
10.2 Preventative Maintenance....................................................................................................... 107 
 Main Duct Cooling Fans............................................................................................................................ 107 
 DC Link Capacitors................................................................................................................................... 107 
10.3 Repair...................................................................................................................................... 107 
11 Compliance ...................................................................................................................................... 108 
11.1 Applicable Standards .............................................................................................................. 108 
11.2 European Compliance............................................................................................................. 108 
 CE Marking............................................................................................................................................... 108 
 EMC Compliance...................................................................................................................................... 110 
 EMC Standards ........................................................................................................................................ 110 
 EMC Installation Guidance ....................................................................................................................... 117 
 Harmonic Information ............................................................................................................................... 123