Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A
Page 26 of 27
Manual Reset
The factory default setting is Manual Reset. This means that when the Overload Trip is activated, the starter
cannot be restarted without pressing the Reset key. The Overload Trip will not reset until the motor cools down
(see 3.1.3.d). The Manual Reset function is also “trip free”. Holding in the Reset key will not prevent the
Overload Trip from activating and protecting the motor.
Note:
When the Overload Trip activates, the Overload LED will glow solid. When the motor cools
down, the LED will begin to flash, indicating that the Overload Trip can be reset.
Automatic Reset
If Automatic Reset is necessary, change from Manual Reset to Automatic Reset by using Function F005. (See
Section 5 for details). In this mode, a 3-wire control circuit will be capable of restart when the
VMX Series
has
reset itself after the cool down period.
WARNING!
Two-wire control systems may restart without warning when Auto Reset is
selected. Extreme caution should be exercised. To prevent automatic
restarting with 2-wire control systems, use external interlocking to provide
sufficient warning and safety to operators. A Warning Label similar to that
shown below (and the one provided in the packet with this manual) must be
located where visible (on the starter enclosure and/or the driven equipment)
as required by local code.
NEMA Class Trip Curves
NEMA Class trip curves are based on a common tripping point of 600% of motor Full Load Amps (FLA). Curves
vary by the amount of time before the unit trips. As an example, a Class 20 curve will trip in 20 seconds at 600%
of FLA. The factory default setting of Class 10 will trip in 10 seconds at 600% of FLA.
Dual Overload Trip Curves
The
VMX Series
Soft Starter provides two separate Overload Trip Protection Curves, one for starting and one
for running conditions. The starter’s At-Speed detection circuit determines when the motor has reached full
speed. When the At-Speed condition is reached, the overload trip curve will shift from the Start to the Run level,
as programmed in Functions F003 and F004. See Section 5.6.1 for programming details.
Starting Overload Trip Curve
During the start mode, Overload Trip Curves are selectable from NEMA Class 5 through Class 20 only. The
default setting of Class 10 allows protection for the overload capacity of the soft starter as well as the motor.
Use a higher Trip Class only if nuisance tripping occurs with the default setting.
Running Overload Curve
During the Run mode, Overload trip curves are selectable from NEMA Class 5, 10, 15, 20, 25, and 30. Program
the appropriate curve according to the characteristics of your motor and load.
WARNING: MOTOR CONNECTED TO THIS EQUIPMENT
MAY START AUTOMATICALLY WITHOUT WARNING
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
