Lenze SCD Series - Manual (Page 13)

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In order to reform the capacitors and prepare the drive for operation after a long period of inactivity,
apply input power to the drive for 8 hours prior to actually operating the motor.
6.2 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:
“AC Technology Corporation inverter products are sold with no warranty of fitness for a
particular purpose or warranty of suitability for use with explosion proof motors. AC Technology
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."
7.0 INPUT AC POWER REQUIREMENTS
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 15.0 - 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 - 25 HP (5.5 -
18.5 kW), 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.
WARNING!
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.