This document and its content is confidential and the property of Levitronix
®
and shall not be reproduced, distributed,
disclosed or used for manufacturing or sale of Levitronix
®
products without the expressed written consent of Levitronix
®
.
Hazardous voltage may be present
Always isolate the electrical power supply before making or changing
connections to the unit.
In case of usage of an inadequate AC/DC power supply, mains voltages may be
present (even if the system is designed for 48 VDC). The usage of a galvanically
separated power supply, which is certified by a 3
rd
party (UL or CE), is required.
4.1.1 Installation Instructions for Power Supply and PLC Interface Signals
• Connection: Table 5 provides an overview of the fan connectors (adaptor cables available as
accessory).
Connect power and desired interfaces to the respective pins and connect the cable shield to earth.
Figure 14 provides a reference for hardware configuration of the PLC inputs and outputs.
• Power requirement: See section 3.1 for the power consumption of the bearingless fan.
• PLC requirement: To operate the bearingless fan with a PLC, a minimum of one analog input is
needed for speed control, or a set of two analog inputs for process (pressure or flow) control. The
analog output can be used to monitor operating parameters. See Table 5 for an overview of the
standard functionality. For in-depth details on the configurability of PLC interface, please refer to the
firmware specification document (standard firmware: SW-3502-04).
• RS485 interface: To use RS485 as a control or service interface, an initialization resistor network
according to Figure 13, Figure 14 should be used to ensure stable communication and avoid
disturbance effects.
For service and debugging purposes with the Levitronix
®
Service Software an RS485 to USB converter
cable (initialization network included) can be ordered according to Table 2.
Do not use multiple master devices at the same time.
• RS485 Fieldbus Multi-System Arrays: Several systems can be directly connected to the same
RS485 master by connecting RS485+, RS485- and ground to each other. See Figure 13.
Address setting of the fan units can be done with the Levitronix
®
Service Software and a PC.
A termination resistor is recommended for long bus lengths. Do not use closed ring arrangements.
Contact Levitronix
®
technical support (section 6.3) for further details and support.
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