16
S611 Soft Starter
MN03902011E—May 2012 www.eaton.com
Using Auxiliary Contacts
The S611 soft starter contains two (2) auxiliary contacts to
indicate status. Both relays have user defined attributes.
Relay contact configuration is selectable in the Advanced
configuration Menu.
Relay 1 uses contacts 13 and 14.
The following contact configurations are available for Relay 1:
0
= Faulted
1
= Not faulted
2
= Run (in bypass)—default value
3
= Not in bypass
4
= Motor energized
5
= Motor not energized
Relay 2 uses contacts 96 (common), 97, and 98. The
following contact configurations are available for Relay 2:
0
= Faulted—default value
1
= Not faulted
Often these contacts are used as shown with indicating
lamps (see figures on this page). In some installations, the
user may wish to use an electromagnetic relay for indication
of the status at a remote location for use by a programmable
controller (PLC), or in a 120 Vac control circuit.
If the S611 soft starter is subject to mechanical shock during
operation, it is possible that these contacts may momentarily
open, causing nuisance fault tripping of down stream
devices. When used with an indicating lamp, a momentary
contact opening would not be observed. In order to assure
proper application, it is suggested that the following
recommendations be followed:
PLC Interface
It is suggested that a 20 ms delay be programmed to assure
the contact status before a change of status is indicated. The
application and the environmental issues will determine the
exact requirements.
120 Vac Signal Control
When a relay is used in conjunction with an electronic
control, it is highly recommended that a noise suppressor be
used across the relay coil. In the case of an AC coil, the noise
suppressor is made up of a series connected resistor and
capacitor as shown in the figure below. Usually the delay in
the relay opening is very small, so if the system is subject to
shock, a delay should be added in the external control before
the contact change of state is recognized. The resistor is
rated 100 ohms at 0.5W. The capacitor is 0.25 μF at 250 Vac.
120 Vac Control
24 Vdc Signal Control
When a relay is used in conjunction with an electronic
control, it is highly recommended that a noise suppression/
snubber diode be placed across the relay coil as shown in the
figure below. This diode offers two benefits. First, the
suppression of any electrical noise generated when the relay
coil is de-energized. Second, the diode delays the opening of
the relay slightly as it dissipates the energy stored in the
relay coil. This delay is often long enough to compensate for
the potential effects of a mechanical shock opening the
control contact. A typical suppression diode is a 1N4001.
24 Vdc Control
Using a Supplemental Line Contactor
In some installations, it may be necessary to use an
electromagnetic contactor in series with the soft starter. In
this case, it is recommended that the contactor be placed on
the load side of the soft starter. The contactor must be
closed prior to starting the soft starter and remain closed
until the soft starter has been stopped to ensure proper soft
starter and system operation.
If an electromagnetic contactor is used on the line side of the
soft starter, additional control circuitry must be supplied by
the user when using edge control to ensure the line power is
supplied to the soft starter before control power is applied. If
this sequence is not followed, the soft starter will fault on
either a phase loss or zero voltage-crossing fault.
If it is desired to place an electromagnetic contactor on the
line side of the soft starter when using level control, no
additional control circuitry is required. A start can be
completed when the line power is supplied to the unit after
the control power, providing the
Reset Mode
parameter is
set to AUTO and the unit has a ready light status with
120 Vac on the start terminal.
CAUTION
If the AUTO Reset mode setting is used, CAUTION must be
exercised to assure that any restart occurs in the safe
manner.
–
+
13
14
97
96
98
Bypass
Ready
120 Vac
Supply
Fault
R
R
R
–
+
13
14
R
97
96
98
Bypass
Ready
24 Vdc
Supply
Fault
R
R
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Содержание S611
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