User Manual – Rev BE    AMETEK Programmable Power 
MX Series  316 
9.11.8  FC Option 
When this option is enabled the output frequency will step ±0.25% of program 
value 
9.12  Option –EXTD - External Drive 
The MX45 series power source system EXTD option can be used to drive the MX 
amplifier outputs with a customer supplied external signal, apart from the 
standard drive signal from the programmable controller.  Using the EXTD allows 
a quick, low cost and simple way of direct real-time control of the output of the 
power supply. 
Each input is optically isolated from each other and the LV supplies inside the 
MX cabinet.  If desired, the COM inputs for A, B and C can be tied together 
when a three-phase drive signal is used 
 
External Oscillator connector 
1   A H I   
0-7Vrms Phase A Input  
2   ACOM  
Phase A Common  
3   B HI   
0-7Vrms Phase B Input  
4   BCOM  
Phase B Common  
5   C HI   
0-7Vrms Phase C Input  
6   CCOM  
Phase C Common  
The input signal level is 0 – 7.00Vrms for FS output on 300V range 
The input signal level is 0 – 7.00Vrms for FS output on 150V range 
If voltage, current or frequency exceeds the system specifications the internal 
controller will automatically take control and shut down the output and an error 
message will be generated. Short circuit and over temperature protection are 
included during EXTD operation. 
To enable the EXT drive option from the front panel controller, proceed as 
follows: 
•  Go to MENU3 
•  Go to UTILITY 
•  Select VOLT/CURR CONTROL field 
•  Next, set ALC = OFF