Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A
Page 27 of 27
Overload Trip Curve Chart
Figure 15: VMX Series Overload Trip Curves
Overload Protection During Bypass
When a Bypass Contactor is used to shunt power around the SCRs in the
VMX Series
(as in the VMX…-BP
version), overload protection is maintained as long as the
VMX Series
is directly controlling the contactor. No
additional Overload Relay is necessary for normal operation.
Special Consideration for Across-the-Line (Direct-on-Line) Contactors
When the Bypass Contactor on a
VMX…-BP Series
has been selected to be used for Across-the-Line restart,
supplemental overload protection may be necessary. For this application, refer to the External Overload Relay
Applications supplement and wiring diagram in Appendix 5 and section 4.2.6.a of the Advanced Installation,
Operation and Programming Manual for detailed instructions.
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