
YW900 User Manual
Chapter 1 Safety and Cautions
1.2.5 Voltage-sensitive device or capacitor on output side of the AC drive
Do not install the capacitor for improving power factor or lightning protection
voltage sensitive resistor on the output side of the AC drive because the
output of the AC drive is PWM wave. Otherwise, the AC drive may suffer
transient overcurrent or even be damaged.
1.2.6 Contactor at the I/O terminal of the AC drive
When a contactor is installed between the input side of the AC drive and the
power supply, the AC drive must not be started or stopped by switching the
contactor on or off. If the AC drive has to be operated by the contactor, ensure
that the time interval between switching is at least one hour since frequent
charge and discharge will shorten the service life of the capacitor inside the
AC drive.
When a contactor is installed between the output side of the AC drive and the
motor,do not turn off the contactor when the AC drive is active. Otherwise,
modules inside theAC drive may be damaged.
1.2.7 When External Voltage is Out of Rated Voltage Range
The AC drive must not be used outside the allowable voltage range specified
in this manual. Otherwise, the AC drive may be damaged . If required, use a
corresponding voltage step-up or step-down device.
1.2.8 The Derating of the AC Drive
Different power grade frequency converter has its default carrier frequency,
when to run at a higher carrier.frequency, the AC Drive must to reduce the
amount when running.
1.2.9 Prohibition of Three-Phase Input Change into Two-Phase Input
Do not change the three-phase input of the AC drive into two-phase input.
Otherwise, a fault will result or the AC drive will be damaged.
1.2.10 Surge Suppressor
The AC drive has a built-in over-voltage, over-current device for suppressing
the surge voltage generated when the inductive loads around the AC drive are
switched on or off. If the inductive loads generate a very high surge voltage,
use a surge suppressor for the inductive load to prolong the service life of the
AC drive.
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CFM90
Rev.00
11/04/2023
MOTORTECH S.A.
Mocbos® | Enertronica Santerno
MOTORTECH S.A.
Mocbos® | Enertronica Santerno