Many customers want to upgrade their actuator on their engine with an F Series but they don't know how to make it work as their current  APECS 4500 controller provides a current PWM (6A). The steps are the following

1) Using APECS Tool (ACT) change the APECS calibration parameter TPC_PERIOD from 100Hz to 400Hz. The values in TPC_PERIOD are in μsec (10^-6). 

We know Hz = 1/t , so  t = 1/Hz 

Hence t = 1/400 = 0.0025 sec = 2500μsec.

 The Duty Cycle output of the APECS 4500 is typically read 10% higher in the F-Series. 

A default setting of TPC_Duty_LMX .945=95% is used in the APECS.  If the PWM Duty Cycle High Shutdown is used in the F-Series it will cause the F-Series to shutdown at any APECS duty cycle output >90%. In this case you can set the TPC_Duty_LMX value <0.90 (typically .85, <90%) until the shutdown does not occur or simply set the F-Series shutdown to an alarm in the F-Series wset file. 

2) Wiring 

A) For F Series 14 pin

Connect J1-5 and J1-8 from APECS 4500 to 18 and 10 pins respectively. To make it work connect a 1ΚΩ resistor across pins 18 and 15 on the F Series. 

B) For F Series 23 pin

Connect J1-5 and J1-8 from APECS 4500 to 12 and 7 pins respectively. To make it work connect a 1ΚΩ resistor across pins 12 and 11 on the F Series.