Eurotherm 590A SERIES, Product Manual

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5 - 6
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.
D6 MAIN CONTACTOR COIL N
This terminal is internally connected to the auxiliary supply neutral and provides a convenient connection point
for the contactor coil neutral connection.
D7 AUXILIARY SUPPLY (NEUTRAL)
D8 AUXILIARY SUPPLY (LIVE)
These terminals are the auxiliary connections for the control power switch mode supply, contactor control relay
supply and cooling fan supply (when force cooled). The voltage applied to these terminals is product code
dependent (only for fan supply). The switch mode power supply is auto ranging from 110 - 240, 50/60 Hz.
Additions to Technical Manual
Subject-External Supply Terminals D1 & D2
These terminals are used for the External AC Supply connection (for the Motor Field Supply) when the Internal
AC Supply is unused. The following actions must be taken:
1) These terminals are now
energised when “Internal Field Supply” option is used, and the 3 phase supply
(L1/2/3) is energised. Protection is available via the on-board Field supply fuses FS2, FS3.
2) When utilising the “External AC Supply” connection, internal wiring links
must be removed and connected to
staging posts provided.
The internal wiring links (Red and Yellow) are identified by the following procedure
(refer to sheet 2)
a) Isolate the Drive
b) Loosen control board fixing screws (2 off) and orientate control board to allow access to power board.
c) Identify internal field supply link (colour-Red) where it is connected by “Faston” at the left hand side of
Terminal D1. Remove this link from the faston connection and place on staging post “F8” located to the left.
(To
enable positive identification of the correct link, Faston F8 should now be connected to FS2, and L1. Verify by
continuity test)
d) Identify internal field supply link (colour-Yellow) where it is connected by “Faston” at the mid-point below
terminals D1 & D2. Remove this link from the faston connection and place on staging post “F16” located to the
left.
(To enable positive identification of the correct link, Faston F16 should now be connected to FS3, and L2.
Verify by continuity test)
e) The External Field Supply can now be connected via externally mounted fast acting 20 Amp fuses. (Note that
the phase of D1 must be derived from L1, and the phase of D2 must be derived from L2).
POWER BOARD AH385621
D1 D2
D3 D4
Red
F8
F16
Yellow
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