BENSHAW RSi GM2 Series, Instruction Manual

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Learning Advanced Features
890054-00-00
GM2 Series VFD 113
Pre-PID Operation
Pre-PID is a function that allows the inverter to run at a set frequency (AP.34) for a set amount of
time (AP.36) prior to normal PI Control operation. There is also a Pre-PID exit value (AP.35) that
must be set. The inverter will exit Pre-PID when the monitored feedback exceeds the Pre-PID Exit
value. This must occur before the set time.
Pre-PID Operation Setting Details
Code and
Features
Description
AP.34 Pre-PID
Freq
Set the frequency to run at prior to PID operation. Pre-PID operation
continues until the control variable (AP.35, Pre-PID Exit) is exceeded. or
the time
AP.35 Pre-PID
Exit,
AP.36 Pre-PID
Delay
When the actual feedback variable exceeds the value set at AP.35, PID
control operation begins. It the time (AP.36, Pre-PID Delay) expires and
the actual feedback variable is still less than the value set at AP.35, a
“pre - PID Fail” fault will occur and the output will be blocked.
PID Operation Sleep mode
During normal PID Control operation, if demand becomes minimal and inverter operation
is not required, the inverter can enter Sleep Mode. A sleep frequency can be set (AP.38, PID
Sleep Freq) along with a sleep delay time (AP.37, PID Sleep DT). If the operation continues
at a frequency below the sleep frequency for the time set in sleep delay time, the inverter
will enter sleep mode. During sleep mode, the inverter continues to monitor the feedback
of the process variable. A Wake Up level (AP.39, PID Wakeup Lev) can be set to resume
normal PID Control operation. An additional setting of Wake Up mode (AP.40, WakeUp
Mod) can be set to further define the Wake Up Level.