High Country Tek HGC-2, Closed Loop Controller - Manual (Page 15)

Hydraulic Generator Controller – HGC-2
15
HGC-2 Controller Settings and Descriptions :
TARGET FREQUENCY - The Target Frequency parameter sets the desired output frequency of the generator
to 50Hz or 60Hz. The Proportional parameter is a variable type.
PROPORTIONAL GAIN. - The Proportional parameter sets the proportional gain in the control loop. The
proportional gain represents the P term in a PID control loop. The proportional term is simply a multiplication of
the error which is added to the output. The Proportional parameter is a variable type.
INTEGRAL GAIN
– Integral Gain is used to determine the integral or I term in the PID control loop. The
integral term is a accumulation of error over a period of time. The integral term is generally used to overcome an
offset in the output or to correct for very small deviations over time at a fixed command. The Integral Gain
parameter is a variable type.
DERIVATIVE - The Derivative parameter sets the derivative gain in the control loop. The derivative gain
represents the D term in a PID control loop. The derivative term is the rate of change of the error. The derivative
term is generally used to increase the responsiveness of a system. The Derivative parameter is a variable type.
PID LOOP TIME
– PID Loop Time represents the PID loop closure time in number of dither cycles. Therefore,
the lower the number, the more quickly the system will respond to error. The PID Loop Time parameter is a
variable type.
RAMP UP RATE
– The Ramp Up Rate sets the rate at which the controller will increase current to the
solenoid once enabled. Once the AC frequency is within approximately 10% of the target frequency the closed
loop control algorithm will take over. The Ramp Up Rate parameter is a variable type.
RAMP DOWN RATE
– The Ramp Down Rate sets the rate at which the controller will decrease current to the
solenoid after the enable signal is removed. Once the AC frequency is within approximately 10% of the target
frequency the closed loop control algorithm will take over. The Ramp Up Rate parameter is a variable type.
DITHER FREQ. - The Dither Frequency parameter has 11 options for dither control. The choices are 50, 75,
100, 125, 150, 175, 200, 225, 250, 275, 300, 350, 400, 500 and 1000 Hz. Dither control provides low frequency
modulation which is required in many proportional valve applications. The Dither Frequency parameter is
variable.
MINIMUM OUTPUT - The Minimum Output parameter represents the minimum current of the output. This is
often referred to as the dead band. The value displayed represents the current in milliamps (amps for -12A, -
25A). The Minimum Output parameter is variable.