GE AF-300 P11 User Manual

Contents

5-41H25 PID control (Feedback filter)H 2 5 F B F I L T E RSetting range: 0.0 to 60.0 secondsThis filter is for feedback signal input from Terminals 12 orC1. This filter stabilizes operation of the PID controlsystem. A set value that is too large, however, deterio-rates response.H26 PTC thermistor (mode select)H 2 6 P T C M O D ESetting range: 0: Inactive1: ActiveSet this function active when the motor has a PTCthermistor for overheat protectionConnect the PTC thermistor as shown in the figure below.Turn on switch PTC on the control PCB. The trip mode isactivated by OH2: External thermal relay tripped.Note: Must be 0 setting when using 4-20mA reference orfeedback signal and the PTC switch must be off.H27 PTC thermistor (level select)H 2 7 P T C L E V E LSetting range: 0.00 to 5.00VThe voltage input to Terminal C1 is compared to the setvoltage level. If the input voltage is equal to or greaterthan the set voltage, H26 PTC thermistor (Mode select)starts.The PTC thermistor has its own alarm temperature. Theinternal resistance value of the thermistor largely changesat the alarm temperature. The operation voltage level isset using this change in the resistance value.The figure above for H26 PTC thermistor (Mode select)shows that a 250W resistor and the thermistor (resistancevalue Rp) are connected in parallel. Hence, voltage Vc1 atTerminal C1 can be calculated using the following formula:Vc1 X 10 [V]250 • Rp250 + Rp1000+ 250 • Rp250 + RpThe operation level can be set by bringing Rp in the Vc1calculation formula into the following range.Rp1 < Rp < Rp2To calculate Rp, use the following formula:Rp Rp 1 + Rp2 [Ohm]2