Magnetek Elevator Quattro DC - Input Voltage Requirements

Appendix – Input Voltage Requirements
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Appendix
Input Voltage Requirements
Quattro™ DC has an active front that can regulate DC motor voltage to be higher than
the nominal Vac line-to-line input. This application note shows how to determine the
minimum input line voltage required.
There are three limitations when determining nominal line-to-line voltage requirements
of a Quattro™ DC drive. Motor current, line amps, and motor voltage are all factors in
the voltage input requirement of the drive.
1. Select drive size to meet motor ampere requirements. Selections are 125A,
150A, 200A, 250A or 300A.
2. Perform Equation 1 and Equation 2 using Motor Voltage and Current the
motor needs to run at contract car speed with contract load in up direction
(Full Load Up Voltage and Current)

2
751.3 Voltage Motor
V
L-L


Equation 1: Nominal Line-to-line Voltage











Amps Drive Rated
0.92 Voltage Motor Current Motor Rated
V
L-L
Equation 2: Nominal Line-to-line Voltage
Where: V
L-L
= Nominal Input Line-to-Line Voltage
Drive Amps = Current Rating of Quattro™ DC (125A, 150A, 200A, 250A, or 300A)
Rated Motor Current = Armature Motor Current required to go contract speed and load up
Rated Motor Voltage = Armature Motor Voltage required to go contract speed and
load up
3. Use the LARGER of the values from Equation 1 and Equation 2. Note: This
value must be lower than 480VAC due to input limitations of the drive.
Example:
Rated Motor Run Current 115A
Rated Full Load Motor Voltage 460VDC
Drive Current Rating 125A

2
751.3 460
V
L-L


;

VAC370 V L-L 











125
0.92 460 115
V
L-L
;

VAC 389 V L-L 
Therefore, the drive requires a minimum nominal voltage of 389VAC on the input to
run a motor with the Rated Full Load Motor Voltage of 460VDC and rated current of
115A.