Product Overview 1-21
1560D-UM051D-EN-P – February 2005
Bulletin 1562D • Basic Control – Soft Stop or Pump Control (cont.)
If the motor has started, the unit is in the bypass mode, and a trip occurs
within the Dialog Plus module or from an external protection relay. “MC”
and “MCX” will drop out immediately. This will complete the hold-in
rung ahead of the “BC” relay, to keep the Bypass contactor closed for a
short time to protect the power electronics from any voltage or current
transients due to the abnormal conditions which caused the trip. A trip due
to an overload or fault condition will result in a “coast” stop.
Bulletin 1562D • SCANport Control – Standard Module
When wired as shown in Figure 1.20, the controller operates as follows:
When a Start command is initiated via the SCANport, the Dialog Plus
module closes an internal hold-in contact between terminals 16 and 17. If
there is voltage present on terminal 17, it will appear at terminal 16, which
has voltage sensing capability. If voltage is sensed at terminal 16, the
module will close the “Normal” contacts at terminals 29 and 30 to initiate
the start sequence. The motor can be stopped by removing power to
terminal 17 (and therefore terminal 16), or via SCANport, which will cause
the internal contact between 16 and 17 to open, thus removing power from
terminal 16.
Refer to Chapter 8, Serial Communications, for more information on using
SCANport to control the MV-Dialog Plus controller.
Bulletin 1562D • SCANport Control – Soft Stop or Pump Control
When wired as shown in Figure 1.21, the controller works the same as
described above for the Standard module. A connection must be added to
supply voltage to terminal 15 on the Dialog Plus module, to activate the
option input. The SCANport allows for both an option stop (Soft Stop or
Pump stop) and a “coast” stop. A stop may also be forced by opening the
connection to terminal 15 (option stop) or terminal 17 (coast stop).
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