Appendix – Input Voltage Requirements
155
Low Voltage Field Module Option Board
Due to the expanded options on the Low Voltage Field Module, 20 amps and 40
amps, slight setup is required. If the application is below the 20 Amp limitations, verify
the connector from the transformer is connected to J3-A, and the jumper on JP1 is
connected to A. If the application requires the 40 Amps, verify the connector from the
transformer is connected to J3-B and the JP1 connected to B.
Use these formula’s to determine if the low voltage field module will operate in the application.
Calculate both Vbus and Vf,
Vin x 1.41 + (DC bus boost, default = 30) =
Vbus
Field amps x Field Resistance =
Vf
Where Vin is the AC voltage applied to the drive, this is either measured at the line fuses or in the
case the drive utilizes an auto transformer it would be the voltage applied to the drive from the
secondary.
Field amps are less than or equal to 20, then;
Vbus / 2 must be greater than or equal to (Vf x 1.5)
Field amps are greater than 20, then;
Vbus / 4 must greater than or equal to (Vf x 1.5)
If either the conditions are not true then the High voltage module must be used.
Set JP1 to A for 20A connection
Set JP1 to B for 40A connection
Set JP1 to A for 20A connection
Set JP1 to B for 40A connection
Plug transformer into J3-A for 20 Amp
Connection (JP1 must be set to A)
Plug transformer into J3-B for 40 Amp
Connection (JP1 must be set to B)
The J3-B is on the left and J3-A is on
the right
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