Table of Contents
Advertisement
11-8
Technical Specifications
Terminal Information (Power Board)
Terminal
Terminal Function
Description
External field supply
External single phase ac Line 1 input to field bridge.
FL1
External field supply
External single phase ac Line 2 input to field bridge.
FL2
Required AC Input Voltage = 1.11 x Nominal DC Output.
The field regulator will control the field current provided that the
Nominal DC Output voltage exceeds the field voltage by at
least 10%.
i.e.
The external AC supply must be fitted with high speed fuses to
protect the field regulator. For controllers with 10A field
capability 10A fuses should be used, those with 20A field
capability 20A fuses.
Note: When using an external ac input it is important to have
the correct phase relationship on the terminals. The supply
must be derived from L1 (Red) and L2 (Yellow) phases directly or
indirectly through a transformer. L1 must be connected to D1,
and L2 to D2.
Field Output
DC supply for motor field connections.
F+
Field Output
DC supply for motor field connections.
F-
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
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.
V
= 1.11 x V
AC
and
V
= 1.1 x V
DC
therefore
V
= 1.22 x V
AC
Vratio x VAC
=
100
DC
FIELD
FIELD
Signal Level
Terminal
Number
500V ac maximum,
D1
50-60Hz line-to-line
500V ac maximum,
D2
50-60Hz line-to-line
0.9 x Vac
D4
0.9 x Vac
D3
590 Series DC Digital Converter
Advertisement
Table of Contents
