Lenze SCF frequency inverter - Manual (Page 15)

Lenze 13466146 EDBSF01 v24 EN
15
Installation 3
3.1.2 Explosion Proof Applications
Explosion proof motors that are not rated for inverter use lose their certification when used for
variable speed. Due to the many areas of liability that may be encountered when dealing with these
applications, the following statement of policy applies:
“Lenze AC Tech Corporation inverter products are sold with no warranty of fitness for a particular
purpose or warranty of suitability for use with explosion proof motors. Lenze AC Tech Corporation
accepts no responsibility for any direct, incidental or consequential loss, cost, or damage that may
arise through the use of its AC inverter products in these applications. The purchaser expressly agrees
to assume all risk of any loss, cost, or damage that may arise from such application."
3.2 Input AC Power Requirements
DANGER!
Hazard of electrical shock! Capacitors retain charge after power is removed. Disconnect
incoming power and wait until the voltage between terminals B+ and B- is 0 VDC before
servicing the drive.
The input voltage must match the nameplate voltage rating of the drive. Voltage fluctuation must
not vary by greater than 10% overvoltage or 15% undervoltage.
NOTE
Drives with dual input voltage ratings must be programmed for the proper supply
voltage (refer to Parameter 01 - LINE VOLTAGE SELECTION in Section 4.4 - Description
of Parameters).
The drive is suitable for use on a circuit capable of delivering not more than 5,000 RMS symmetrical
amperes at 5 HP (3.7 kW) and below, and 18,000 RMS symmetrical amperes at 7.5 HP (5.5 kW) and
above, at the drive’s rated voltage.
If the kVA rating of the AC supply transformer is greater than 10 times the input kVA rating of the
drive(s), an isolation transformer or 2-3% input line reactor must be added to the line side of the
drive(s).
Three phase voltage imbalance must be less than 2.0% phase to phase. Excessive phase to phase
imbalance can cause severe damage to the drive’s power components.
Motor voltage should match line voltage in normal applications. The drive’s maximum output voltage
will equal the input voltage. Use extreme caution when using a motor with a voltage rating which
is different from the input line voltage.