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2 GENERAL INSTRUCTIONS
2.1 ABOUT THE MANUAL
This manual presents how to install, operate, the main features and basic troubleshooting of the UR11 (rectifier
unit) models.
For more information on other features, accessories and operating conditions, refer to the following mounting
guide:
RACK 2/RACK 3 mounting guide.
The mounting guide is available in the CD-ROM provided with the rectifier unit or it can be downloaded from
WEG website at - www.weg.net.
2.2 TERMS AND DEFINITIONS USED IN THE MANUAL
Normal Duty Cycle (ND): inverter duty cycle that defines the maximum continuous operation current (I
the overload current (110 % for 1 minute). It is selected according to the programming of the inverter connected to
the rectifier output. This duty cycle shall be used for the operation of motors that are not subjected to high torque
loads (with respect to the motor rated torque) during its operation, starting, acceleration, or deceleration.
I
: inverter rated current for use with the normal duty (ND) cycle.
nom-ND
Overload: 1.1 x I
nom-ND
Heavy Duty Cycle (HD): inverter duty cycle that defines the maximum continuous operation current (I
the overload current (150 % for 1 minute). It is selected according to the programming of the inverter connected
to the rectifier output. This duty cycle shall be used for the operation of motors that are subjected to high torque
(with respect to the motor rated torque) during its operation, starting, acceleration, or deceleration.
I
: inverter rated current for use with the heavy duty (HD) cycle.
nom-HD
Overload: 1.5 x I
nom-HD
Current Unbalance (%):
unbalance at rectifier unit X - phase Y =
I
+ I
+ ... + I
Y1
Y2
I
=
N
YAVG
Where:
N = number of power units.
I
= Y phase current (R, S or T) of the rectifier unit N.
YN
I
= Y phase average current.
YAVG
Rectifier: input circuit of inverters that transforms the AC input voltage in DC voltage. It is composed of power
diodes.
/ 1 minute.
/ 1 minute.
I
- I
YX
YAVG
I
YAVG
YN
x 100
General Instructions
) and
nom-ND
) and
nom-HD
UR11 | 2-1
2
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