VMX Quick Setup Guide 31 | P a g e
Overload Trip Curve Chart
Figure 9: 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 must be added. 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.
To Next Page
Loading...
