motortronics VMX2 SERIES, User Manual

Page: 14 / 94

VMX
2
Series Digital Solid State Soft Starter User Manual 12 | P a g e
3.1.3 Disabling the Overload Protection
The Overload Protection feature can be disabled if necessary. When
using external devices such as Motor Protection Relays or when the
VMX2 Series is wired downstream from an existing starter, this feature
can be disabled to prevent conflicts with external Overload Protection
devices. When the
VMX2 Series is controlling multiple motors, the built-
in Overload Protection must be disabled and individual thermal overload
relays must be installed on the motor leads going to each motor (see
Appendix 4 for additional details). To disable the Overload Protection
function, use
F005 .
WARNING!
Do NOT disable Overload Protection unless another Thermal
Overload Protection device exists in the circuit for all three
phases.
Running a motor without Overload Protection presents serious
risk of motor damage or fire.
▪
3.1.3.a 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 als
o “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 be on
solid. When the motor cools down, the LED will begin to flash,
indicating that the Overload Trip can be reset.
▪
3.1.3.b 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
VMX2 Series has reset itself after the cool down
period.
WARNING!
Two-wire control systems may restart without warning when Auto
Reset of the Overload Protection 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.
WARNING: MOTOR CONNECTED TO THIS EQUIPMENT
MAY START AUTOMATICALLY WITHOUT WARNING