590 Series DC Digital Drive Installing the Drive
3-25
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.
• 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.
• 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
NOTE For information about the following terminal/power boards refer to Appendix E: “Technical Specifications” - 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).
Power Board - PCB Reference 385851
This power board (printed with the above number) can be altered for use with either an internal or external motor field supply:
Internal Motor Field (default for this board)
Terminals D3 and D4, the motor field outputs, are energised when the 3-phase supply to L1/L2/L3 is energised and the internal motor field is used.
Terminals D1 and D2 are not energised. The internal motor field supply is fused by the 10A fuses, FS2 & FS3.
External Motor Field Connections
Terminals D1 and D2 on the Power Board can be used for an external ac supply connection for the
Motor Field Supply.
A simple re-wiring procedure disconnects the internal motor field supply and prepares terminals D1
and D2 for the external ac supply connection.
You should provide suitably rated external, fast-acting semi-conductor fusing, to a maximum of
10A.
POWER BOARD AH385851
D1
D2
D3
D4
Red
F8
F16
Yellow
F1
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