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3-20
Installing the Converter
590+ Series DC Digital Converter
Motor Field Options
WARNING!
Isolate the drive before converting to internal/external supply.
The FIELD CONTROL function block controls the motor field. The FLD CTRL MODE
parameter allows you to select either Voltage or Current Control mode.
x
In Voltage Control mode, the RATIO OUT/IN parameter is used to scale the motor field
output voltage as a percentage of the input supply voltage.
x
In Current Control mode, the SETPOINT parameter is used to set an absolute motor field
output current, expressed as a percentage of the calibrated field current (IF CAL).
Internal/External Supply (Frames 2, 3, 4 & 5)
Note:
The Frame 1 unit uses only an internal motor field supply. The Frame H unit uses only an
external motor field supply. For information about the following terminal/power boards
refer to Chapter 11: “Technical Specifications” - Power Board Types, and Terminal
Information (Power Board).
The internal motor field is more widely used, however, there is provision on the unit for an
external motor field supply to be connected (perhaps for where the field voltage is greater than
the input voltage and therefore not attainable, or where the motor field is switched separately for
convenience).
CON
field
external supply
derived from L1 & L2
FL1
FL2
F+
F-
L
N
L1
L2
L3
Filter
Start
Contactor
3-phase supply
110V - 690VAC
High Speed
Fuses
AC Line Choke
3-phase
contactor
3 PH 50/60Hz
(optional)
external
High Speed
Fuses
Figure 3-11 Typical connection diagram
Terminal Board - PCB Reference 470330 (Frame 2)
The position of the jumper selects the board to use either an internal or external motor field.
FL1 FL2
F+
F-
M1
M2
M3
Motor Vent Fan Circuit Breaker
PLG1 to Power Board
PLG2 to Power Board
PLG3 to Power Board
External Field Selector Plug
Terminal Board
L N 3 4 TH1 TH2
FL1
FL2
Field Bridge
Field Bridge
L1
L2
Jumper selecting external field
Jumper selecting internal field
L1
L2
FL1
FL2
fitted pin
non-fitted pin