8.4 Installing Peripheral Devices B A C R/L1 MCCB U/T1 S/L2 T/L3 V/T2 W/T3 D E G F A – Power supply B – Drive C – Shielded motor cable D – Motor E – Separate at least 30 cm F – Controller G – Signal line Figure 8.8 Preventing Induced Noise Reducing Radiated/Radio Frequency Noise The drive, input lines, and output lines generate radio frequency noise. Use noise filters on input and output sides and install the drive in a metal enclosure panel to reduce radio frequency noise. Note: The cable running between the drive and motor should be as short as possible.
A D B F MCCB G A – Metal enclosure B – Power supply C – Noise filter D – Drive E – Noise filter F – Shielded motor cable G – Motor Figure 8.9 Reducing Radio Frequency Noise u Installing Fuses on the Input Side Always install input fuses. Refer to Standards Compliance on page 209 for details on input fuse selection. u Installing a Motor Thermal Overload (oL) Relay on the Drive Output Motor thermal overload relays protect the motor by disconnecting power lines to the motor due to a motor overload condition. Install a motor thermal overload relay between the drive and motor: • When operating multiple motors on a single AC drive.
• When using a power line bypass to operate the motor directly from the power line. It is not necessary to install a motor thermal overload relay when operating a single motor from a single AC drive. The AC drive has UL recognized electronic motor overload protection built into the drive software. Peripheral Devices & Options Note: Disable the motor protection function (L1-0 1 = “0”) when using an external motor thermal overload relay. The relay should shut off main power on the input side of the main circuit when triggered.
n General Precautions when Using Thermal Overload Relays The following application precautions should be considered when using motor thermal overload relays on the output of AC drives in order to prevent nuisance trips or overheat of the motor at low speeds: • Low speed motor operation • Use of multiple motors on a single AC drive • Motor cable length • Nuisance tripping resulting from high AC drive carrier frequency 8 SIEP C710606 33A OYMC AC Drive – J1000 User Manual 155 C S/L2 T/L3 E V/T2 W/T3