Nidec Control Techniques HVAC Drive H300 HMI Bypass, Installation And Commissioning Manual

Page: 33 / 56

HMI Bypass Controller Installation and Commissioning Guide 33
3.2.14 PID Setup
The PID setup screen allows for the configuration of the onboard PID feature.
Control Action : Direct control means that as the PID error increases, the speed
reference also increases. A common application for direct control is a cooling/
heating fan. Reverse control will decrease the speed reference as the PID
error increases. A common application for reverse PID control is a pump with
pressure feedback.
Display Units : Determines the display units for PID setpoint and feedback.
Does not affect PID operation. An example would be “F” or “psi.” Gains :
Determines the gains for the internal PID controller.
3.2.14.1 PID Setup - Sleep/Wake Function
This screen allows the setup of the Sleep/Wake Threshold feature.
The Sleep/Wake function is used to stop the motor if the frequency or
speed reference falls below a specified level so that the system does not run
inefficiently at low speeds.
If the reference is greater than the Sleep/Wake Threshold for longer than
the Wake Delay, then the motor is enabled. If the reference falls below the
(Sleep/Wake Threshold - Sleep Offset) for longer than the Sleep Delay, then
the motor is disabled.
Sleep/Wake Threshold : This is the threshold that the speed reference is
compared against. A value of zero will disable the Sleep/Wake function.