1-20 Product Overview
1560D-UM051D-EN-P – February 2005
Functional Description Bulletin 1562D • Basic Control – Standard Module
When wired as shown in Figure 1.18, the controller operates as follows:
Pressing the "Start" button initiates the start sequence. Relay "CR" closes
and applies control power to terminal 16 of the Dialog Plus module. The
auxiliary contact #3 (set for "normal") closes, picking up "MC" and "MCX",
which completes the hold-in circuit on the start button, and closes the main
contactor.
The Dialog Plus module examines the line voltage, looks for fault
conditions, checks phase rotation, calculates zero crossing information,
and begins gating the SCRs to start the motor.
When the motor approaches rated speed, the Dialog Plus module closes the
"UTS" (up-to-speed) auxiliary contacts, closing relay "BC", which closes
the bypass contactor. The motor then runs at full line voltage. The UTS
signal is also passed to the Interface board.
When the "Stop" button is pressed, the "CR" relay opens terminal 16 on
the Dialog Plus module. The "Normal" contact opens, dropping out the
main contactor, allowing the motor to stop. The "UTS" contact also opens,
but "BC" is held closed for a short time by the "MCX" off-delay contact
and "B" auxiliary. This holds the bypass contactor closed for about 10
seconds to protect the power electronics from any voltage transients due to
opening the motor circuits.
The Standard Control Module includes the "Dual Ramp" feature. To select
Ramp #1 or Ramp #2, a contact is used to change the input state of terminal 15
on the Dialog Plus module. See page 4-10 for information on programming.
Bulletin 1562D • Basic Control – Soft Stop or Pump Control
When wired as shown in Figure 1.19, the controller operates in much the
same manner as in Figure 1.18.
Terminal 15 on the Dialog Plus module now controls the optional start and
stop maneuvers. Terminal 16 must remain energized for the module to
run. When the “Stop” button is pressed, and “CR” opens, the Dialog Plus
will initiate the option stop (Soft Stop or Pump Stop, depending on the
module specified). An uncontrolled, or coast stop, is achieved by opening
the connection to terminal 16. This contact should remain open to ensure
all hold-in contacts clear, to prevent a re-start.
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