LTi SO84.170 ServoOne Drive Controller 170A BG6a
The LTi SO84.170 is the highest power variant in the BG6a housing, delivering 170A continuous and 340A peak current. Designed exclusively with liquid cooling, it is built for the most extreme industrial single-axis servo applications.
Core Specifications
Rated current: 170 A (400V, 8 kHz), peak: 340 A (0-5 Hz)
Mains: 3 x 230V to 480V AC ±10%
Switching frequencies: 4, 8, 12, 16 kHz (derating required above 8 kHz)
BG6a liquid-cooled dimensions: 380 x 540 x 228 mm, weight 41.1 kg
External mains choke mandatory
Integrated brake chopper
Technical Data
Power Ratings
Rated current: 170 A (400V, 8 kHz)
Peak current: 340 A (0-5 Hz)
Connected load: 118 kVA
Power loss at IN: 2500 W (8 kHz, liquid-cooled)
DC link capacitance: 4240 μF
Braking
Brake chopper threshold: 820 V DC
Minimum external braking resistor: 6.5 Ω
Continuous braking power (external): 103 kW
Peak braking power: 103 kW
Optional internal braking resistor: 5 Ω (for liquid-cooled), continuous 4000 W, peak 135 kW
Liquid Cooling
Nominal coolant flow: 11 l/min (max 13 l/min)
Coolant pressure: 1 bar nominal / 2 bar max
Coolant temperature: 5°C to 40°C
Coolant quality: drinking water + corrosion inhibitor
Shutdown at 65°C heat sink
Control
Control supply: 24 V DC (10A start)
Digital I/O: 6 inputs, 3 outputs, relay
Analog inputs: 2 differential (±10V)
Resolver and high-resolution encoder
Motor brake output: 24V/2A
USB, Ethernet, MMC, option slots
Installation Requirements
Due to its size and power, the SO84.170 requires a robust mounting plate. The liquid cooling circuit must provide at least 11 l/min flow at 1 bar pressure. Use 3/8 inch female thread connections with drip-free quick-release nipples. An external mains choke (uk=2%) and external mains filter are mandatory for EMC compliance. Motor cable cross-sections up to 150 mm² are supported.
Commissioning
Commission using DriveManager 5 via Ethernet or USB. The 7-segment display provides status and error codes. Enable STO (ISDSH and ENPO) to release power stage. Parameter sets can be stored to MMC card for cloning. The drive supports fieldbus options (EtherCAT, SERCOS) and iPlc programming.
Braking and Protection
The brake chopper handles up to 103 kW continuous with external 6.5 Ω resistor. For integrated braking, the optional 5 Ω internal resistor provides 4 kW continuous and 135 kW peak. Always connect a thermal switch from the braking resistor to a digital input for overtemperature shutdown.
Applications
Suitable for servo motors up to 90 kW (400V). Typical applications include large presses, steel mill equipment, heavy-duty test stands, wind turbine pitch control, and marine propulsion. The 340A peak ensures maximum dynamic performance.
Compliance
Complies with EN 61800-5-1, EN 61800-3, LVD, EMC. UL approval with class RK1 fuses (e.g., 3 x 200 A).
The LTi SO84.170 delivers unsurpassed power for the most demanding single-axis servo systems.
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