23
H050002740 rel. 1.1 - 17.05.2021
Installation
ENG
Leakage current
The drive is designed to produce minimum leakage current, nonetheless leakage current depends on the length and type
of motor cable, the motor, the effective switching frequency, the type of earth connection used and the type of RFI filter
installed, and therefore may exceed 1 mA.
Compressor protection safety digital input
Connect the two “Safe Torque Off” digital safety input terminals to the normally-closed voltage-free contact of a safety device,
such as a maximum pressure switch (safety device, see the connection diagram). When the contact is open, drive operation is
interrupted. If the Safe Torque Off feature is not used, the two safety digital input terminals must be short-circuited to enable
correct operation of the controller.
Serial network connection
For the serial connection use a shielded, twisted cable for RS485 networks. For very long networks, add a ¼ W 120 Ω resistor
between the Tx/Rx- and Tx/Rx+ terminals on the last controller or device connected, to avoid possible communication
problems. To ensure conformity to the EMC directive it may be necessary to use a ferrite core (for example, Fair-Rite
2631540002) fitted immediately before the drive terminal, winding the three wires (excluding the cable shield) around this.
50002730_016_R01
BUILDING
MANAGEMENT SYSTEM
RS485
Schermo/
Shield
R = 120 Ω
J9
TX/ RX
GND
TX / RX
GND
BMS
BMS
J9
TX / RX
GND
Fig. 3.o