Eurotherm 590SP, Product Manual

Page: 24 / 259

Chapter 3 Installation and Wiring
590SP Digital Product Manual
3 - 6
3
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Drive must
Control Contactor
Coil
DC Contactor
Wiring
G
H
AC Contactor
Wiring
I
Dynamic Brake
Contactor
Interlock
Contactor to Zero
Speed
Jumper C5 to
+24 VDC
(terminal C9)
Switch C5 to +24
VDC (C9) thru
n/o contactor
auxiliary
Figure 3.6- Auxiliary Control Jumpers
Check Jumpers
JP5 and JP6
(line). Move jumpers JP5 and JP6 from positions 2 and 3 to positions 1 and 2 to power the control
transformer externally. The supply is protected by a 1.6 amp fuse.
Motor Isolation
Isolate the motor from power by either breaking the controller input supply with an AC contactor or
the output power with a DC contactor. The 590SP Digital drive must control this contactor to ensure
that current flow is never interrupted while the thyristors are firing.
AC Contactor Wiring
AC contactor wiring is shown in the upper right portion of the wiring diagram in Figure 3.3. Use a
two-pole, normally-opened contactor rated to handle the AC voltage and supply current. Wire the
contactor poles between branch AC circuit protection and the supply input terminals (L1 and L2).
Permanently enable the drive by jumpering terminal C5 (ENABLE) to terminal C9 (+24 VDC).
Always isolate input power to the drive by dropping out the AC contactor power before servicing
the equipment.
NOTE. The control supply must be supplied externally when using an AC contactor.
Connect it as described above in Control Power Wiring.
DC Contactor Wiring
Wire a suitably rated DC contactor between the drive output terminals (A+ and A-) and the motor
armature. Connect terminal C5 (ENABLE) to terminal C9 (+24 VDC) through a normally opened
auxiliary of the main contactor. This keeps the drive disabled until the main contactor closes, and
disables the drive when the contactor opens.
WARNING!
When isolating the armature using a DC contactor, the field remains powered while
the contactor is de-energized.
Dynamic Braking
The DC contactor wiring schematic in Figure 3.3 shows wiring for an optional dynamic braking
application. Dynamic braking requires a DC contactor with an additional normally closed pole rated
to carry full load current upon closing.
NOTE. Dynamic brake contactor poles are rated to make, but not interrupt DC motor
current. To avoid damaging the normally closed contact, interlock the drive's zero
speed output signal to the drive start logic to prevent the drive from restarting until the
motor has reached standstill. This zero speed interlock relay logic is shown at in
Figure 3.3.
J
1
2
3
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