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SINAMICS SL150

The cycloconverter for slow-speed synchronous ａnd induction motors with a high torque

General description

SINAMICS SL150 cycloconverters with thyristor stacks are the optimum choice when it comes to continuously controlling the speed of high‑rating induction ａnd synchronous motors with a high torque ａnd low stator frequencies. They are implemented as three‑phase thyristor bridges in a 6 or 12‑pulse connection. They set themselves apart as a result of their simple design that utilizes a relatively low number of power semiconductors. As a consequence, the SINAMICS SL150 has a high efficiency ａnd high degree of reliability. 
Without any additional costs, the inherent circuit principle of the cycloconverter makes it suitable for four‑quadrant operation – i. e. driving ａnd braking in both directions. The maximum output frequency is typically between 40 and 44 % of the line frequency. Open‑loop ａnd closed-loop control ａnd thyristor monitoring for the complete drive are implemented using components from the SINAMICS system. The thyristors are controlled ａnd monitored opto-electronically via fiber‑optic cables. The heat from the power circuit is dissipated using the cabinet fans.

Features

High efficiency

With SINAMICS SL150, low switching losses ａnd the low loss thyristor technology ensure an extremely high efficiency (99 %). As a consequence, lower demands are placed on the cooling system. At the same time, less space is required for installation.

Used worldwide

The technology employed in SINAMICS SL150 has been successfully used for more than 35 years now. More than 700 units of the previous SIMOVERT D series were supplied in different versions – wherever slow speed applications demand a high power rating ａnd the highest torque.

Top marks for ruggedness ａnd availability

There are some excellent reasons why SINAMICS SL150 is extremely reliable ａnd sets standards when it comes to ruggedness:

• Few components for any particular power rating: 9/18 MVA with 36 thyristors
• Generous ａnd rugged design
• Fast fault diagnostics using an extensive, detailed message system: Trace memory for 14 signals – output at analog outputs
• Fault display at the operator panel
• Feedback diagnostics of the individual thyristors in the power unit

• Available with air ａnd water cooling
• Four-quadrant operation
• High short‑time overload capability: typically 200 % for 60 seconds
• Can be simply integrated into the plant
• Simple operator control ａnd monitoring
• Extremely reliable
• Almost maintenance‑free
• Can be seamlessly integrated into higher‑level automation systems
• Air intake either through slots in the door or from below

• Rolling mills 
  Rolling drives that run continuously typically have 6-pole cylindrical rotor synchronous motors with a rated frequency of approx. 7 Hz (approx. 140 rpm) ａnd a maximum frequency of approx. 20 Hz (approx. 400 rpm), while the large hot reversing stands are equipped with 12-pole motors with a frequency of approx. 5/10 Hz (approx. 50/100 rpm).
• Mine hoists
  Mine hoist drives are equipped with 12 to 16-pole synchronous motors with salient pole rotors with a rated frequency of approx. 5 to 10 Hz operating at speeds from about 50 to 90 rpm.
• Ore ａnd cement crushers 
  The 40 to 80-pole ring motors with salient pole rotors are typically operated at approx. 6 Hz (approx. 10 rpm).
• Excavators

• SINAMICS SL150 replaces the SIMOVERT D
• Thyristor‑based power unit allows power ratings of up to 36 MVA
• Either an open or star connection
• 2 × 950 6‑pulse parallel connection for high power ratings with 12‑pulse line harmonics