AMCI SD4840EK, User Manual

Page: 86 / 104

I
NSTALLING THE
SD4840EK
SD4840EK User Manual
ADVANCED MICRO CONTROLS INC.
86
2.4 Power Wiring (continued)
The SD4840EK units do not have a circuit to limit inrush current when power is applied.
If the power supply voltage is applied through the switching of contacts, damage to the
contacts or contact welding may occur.

Use a power supply that limits the peak output current to a value below the con-
tact switching limit.

The best practice is to remove switching contact from the power supply to the
SD4840EK entirely. Remove power from the SD4840EK by switching off its
power supply.
Remove power from the SD4840EK before servicing. Do not connect or disconnect the
MS-2x11 connector while power is applied.
Figure T1.4 below shows how to wire power to the SD4840EK units. Note that
+Vdc Auxiliary
is only used
when you introduce a circuit for removing power from the motor.
Figure T2.4 SD4840EK Power Wiring
Twisted pair cable with an overall shield should be used for all power supply wiring to limit
EMI. The shield must be connected to the earth ground point used by the power supply. These
cables must be routed away from all of the module’s I/O to further limit the possibility of
injecting noise into the I/O signals.
As shown in the figure above, it is possible,
but not required
, to use a second power supply
when powering the
+Vdc Auxiliary
power input. The
+Vdc Auxiliary
pin can also be powered by
the
+Vdc Main
supply. If a separate supply is used, it must have a nominal output voltage of 24
to 48 Vdc. The output voltage does not have to match the voltage applied to the
+Vdc Main
power input. The commons of the two supplies must be electrically tied together.
+24Vdc to +48Vdc
Power Supply with
Inrush Current Limiter
+24Vdc to +48Vdc
Power Supply with
Inrush Current Limiter
Auxiliary
+24Vdc to +48Vdc
Power Supply
(Not required, but
can be used. See Text Note.)
+Vdc Main
+Vdc Auxiliary
GND
+Vdc Main
+Vdc Auxiliary
GND
TOP VIEW
TOP VIEW
Front of
SD4840EK
Front of
SD4840EK
+Vdc Main
+Vdc Auxiliary
GND
+Vdc Main
+Vdc Auxiliary
GND
Power
Control
Circuit
GND