VMX
2
Series Digital Solid State Soft Starter User Manual
15 |
P a g e
Figure 4.1:
VMX2 Power Connections
Chapter 4 - Connections
4.1
Power Connections
Refer to national and local code for wire sizing and length, connect
power conductors to the unit input terminals marked L1, L2, L3 (R, S, T
for IEC users). Use appropriate compression or mechanical lugs for
termination to these bus tabs. Avoid routing power wires over the
control board or display. Connect the motor leads to the unit terminals
marked T1, T2, T3 (U, V, W for IEC users). If control power is present,
but line power is disconnected from L1, L2, L3, the display will show
[n3PH]
indicating “no 3 Phase”.
Caution!
Never interchange input and output connections to
the unit. This could cause excessive voltage in the
control logic circuit and may damage the unit.
4.1.1 Bypass Contactor
Bypass Contactors are integral (built-in) on all VMX2 sizes. See
sections 1.2.3, 3.1.3.c, and Appendix 4 for more details on contactor
control and overload protection details.
4.1.2 Power Factor Correction Capacitors
Power factor correction capacitors can be connected to motors
controlled by
VMX2 Series
starters; however they must be off-line
during ramping. Connect PFC capacitors to the Line side of the starter
with a separate capacitor control contactor.
WARNING!
Never connect power factor correction capacitors on the load side
of the unit. The SCRs will be seriously damaged if capacitors are
located on the load side.
4.1.3 Grounding
Connect the ground cable to the ground terminal as labeled on the unit.
Refer to the National Electrical Code or your local Code for the proper
ground wire size, and be sure that the ground connector is connected to
earth ground.
Integral
Bypass
Contactor*
VMX2 Starter
.
Disconnect
or
Circuit
Breaker
.
.
MTR
Solid State
Overload
G
R /
L1
T
/
L3
S /
L2
U /
T1
W
/
T3
V /
T2
