Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 125)

Chapter
5
SMC Dialog Plus Controller Special
Application Considerations
SMC Dialog Plus Controllers in
Drive Applications The SMC Dialog Plus controller can be installed in starting and
stopping control applications. A variable frequency drive must b
installed when speed variation is required during run.
Use of Protective Modules A protective module (see Figure 5.1) containing metal oxide varistors
(MOVs) and capacitors can be installed to protect the powe
components from electrical transients and/or electrical noise. The
protective modules clip transients generated on the lines and prevent
such surges from damaging the SCRs. The capacitors in th
protective modules are used to shunt noise energy away from the
SMC Dialog Plus controller electronics.
Note: On SMC Dialog Plus controllers rated 500 Amps and above,
the MOV protection is incorporated as standard.
Figure 5.1 Protective Modules