E-14 Technical Specifications 590 Series DC Digital Drive
Terminal Information (Power Board)
Terminal Description Terminal Function Signal Level Terminal Number
Field Output
F+
DC supply for motor field connections. 0.9 x Vac D4
Field Output
F-
DC supply for motor field connections.
The DC output voltage at these terminals will depend upon the AC supply voltage and the
mode of field control.
Voltage Control
The output voltage will be determined by the ratio parameter in the field variables. The
relationship between the dc output voltage and AC input voltage is determined by the
equation:-
Vdc
Vratio x VAC
100
=
The default value of Vratio is 90% hence the DC output voltage will be the same as for a full
wave diode rectifier i.e., 90% is maximum output.
0.9 x Vac D3
Main contactor coil
Line
This terminal is the switched output from the contactor control relay and is derived from the
auxiliary supply at terminal D8. The output is internally fused at 3A hence contactor coils
having a high pick-up current must be operated via a slave relay.
Note: The contacts of the Contactor Control Relay are suppressed by a series connected
resistor (680 Ohms) and capacitor (22nF) to protect the relay contacts. Users should be
aware that when the contactor Control Relay is “De-energised”, a leakage current of
approximately 2mA can be expected and this should be considered when interfacing to
these terminals. Typically, there could be the energisation of very sensitive relays.
110/240V
50-60Hz line-to-line
D5
Main contactor coil
Neutral
This terminal is internally connected to the auxiliary supply neutral and provides a
convenient connection point for the contactor coil neutral connection.
110/240V
50-60Hz line-to-line
D6
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