98 • Commissioning and Operation Manual
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10.3.1 How Does it Operate?
Selector switches position: Local/Remote/Comm./Off selector is in the Local position and DOL/Soft
Start selector switch is in Soft Start position.
Soft start process is initiated when the Start pushbutton (ST terminals 4 & 3) is pressed.
RS relay is energized (RS terminals 2 & 10). RS N.O. contact (RS terminals 9 & 11), connected in parallel with
the start pushbutton (ST terminals 4 & 3) and holds the relay energized.
Line Contactor C1 and interposing relay RC1 are now energized via another N.O. contact of RS (RS terminals
1 & 3).
Start command to the soft starter is initiated after the Line Contactor is closed (C1 terminals 13 & 14) and via
another N.O. contact of RS (RS terminals 6 & 7) to the soft starter by connecting control voltage to terminals 5
& 6 of the Control Module.
FR relay is energized and energizes the firing transformer via its N.O. contact. (FR terminals 1 & 3)
Relay K1 (IMMEDIATE) is energized immediately after start command is initiated to the soft starter.
The starter ramps up the mains voltage to the motor until it reaches full voltage.
Relay K2 (END OF ACCELERATION) is energized after programmable time delay (default of 5 seconds). The
Bypass Contactor C2 is energized through the N.O. contact of K2 (K2 terminals 6 & 7).
FR relay de-energizes after 2 more seconds and disconnects the firing transformer from the control voltage.
Motor is now running with the Bypass Contactor (C2) closed and the soft starter Power Section is idle.
Soft stop process is initiated when the Stop pushbutton (SP terminals 1 & 2) is pressed.
RS relay is de-energized.
Soft Starter terminals 5 & 6 are disconnected (RS terminals 6 & 7) from the control voltage and cause the soft
starter to enter into soft stop process.
FR relay is energized and energizes the firing transformer via its N.O. contact. (FR terminals 1 & 3)
K2 relay is de-energized.
Bypass Contactor C2 de-energizes via the N.O. contacts of K2 (K2 terminals 6 & 7).
The soft starter ramps down the voltage to the motor.
At the end of the soft stop process the HRVS-DN de-energizes K1 relay. N.O. contact of K1 (k1 terminals 6 &
7) relay in series with N.O. contact of RC1 (RC1 terminals 1 & 3) act as a holding system to the Line
Contactor C1. This enables the Line Contactor to be energized until the soft stop process is concluded.
FR relay is de-energized and de-energizes the firing transformer via its N.O. contact. (FR terminals 1 & 3)
Upon Fault condition:
If trip condition, is detected by the HRVS-DN, K3 is energized. FT and FT/1 are de-energized via N.C. contact
of K3 (K3 terminals 5 & 6) causing RS to trip, C1 to trip and L4 (Fault indication lamp) to turn on.
If trip condition is detected by the external motor protection relay, customer terminals 17 & 18 are opened,
causing FT and FT/1 to be de-energized.
Selector switches position: Local/Remote/Comm./Off selector is in the Remote position and DOL/Soft
Start selector switch is in Soft Start position.
The process is exactly the same as above but RS relay is directly controlled by the remote Start/Stop contacts
(Customer terminals 15 & 16).
WARNING!
When operating the HRVS-DN cabinet from Remote or via the communication
links it is extremely important, because of safety reasons, to monitor the Trip
relay (FT/1 terminals 39-40-41)) indication (See
Figure 38 page 95).
When the trip relay signals for trip remove the start command!
Selector switches position: Local/Remote/Comm./Off selector is in the Comm. position and DOL/Soft
Start selector switch is in Soft Start position.
When it is required to control the cabinet via communication (not only to monitor and/or change the
parameters) it is required to install, in additional to the communication PCB (either Modbus, Profibus or
DeviceNet), an optional Relay PCB.
When the selector is set to communication control, the RS relay is controlled by a relay located in the optional
Relay PCB mounted in the Control Module.
Output terminals from the optional Relay PCB are 31, 32. Refer also to
Figure 13 page 29.
Selector switches position: Local/Remote/Comm./Off selector is in the Local or Remote position and
DOL/Soft Start selector switch is in DOL position.
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