CMC 30 HP30, Installation And Operation Instruction Manual

Page: 158 / 218

Chapter 6 - Parameter Description [APP]
6-66
APP-22: PID Bypass Selection
This is used to bypass the PID operation selected in FU2-
47. Select this code to ‘Yes’ when using MMC function
without PID control. The frequency is determined by real
value of control amount instead PID controller output. The
real value is also used as the Start/Stop reference of Aux.
motors.
The following figure shows the running pattern with this
function applied for controlling the flow rate of a tank. To
control the flow rate according to the water level of a tank,
divide the water level of the tank into the region to the
number of Aux. motors plus one, and map each region
from staring frequency to maximum frequency. The
inverter increases output frequency to lower the water
level in the tank when the water level in the tank rises.
When reaching maximum frequency, inverter connects aux.
motors connected directly to commercial line. After
connecting aux. motor, inverter starts again from the
starting frequency. By selecting APP-22 to ‘Yes’, PID
operation is disabled and Control Mode (FU2-47) is
changed to ‘V/F’. PID Bypass is available only when Freq.
Mode (DRV-04) is set to ‘V1’, ‘1’ or ‘V2’. The level in a tank
can be checked in APP-30 [Actual Value] and APP-31
[Actual Percent].
[Aux. Motor Start/Stop without PID Control]
APP-23: Sleep Delay Time
APP-24: Sleep Frequency
APP-25: Wake-Up Level
Sleep function is initiated when flow demand is low.
Inverter stops motor when the motor runs below Sleep
Frequency (APP-24) during Sleep Delay Time (APP-23).
While in the sleep state, inverter keeps monitoring and
initiates Wake-Up function when the real value of the
controlling amount has decreased below the Wake-Up
level (APP-25).
☞ Note: Sleep function is not operated if the Sleep Delay
Time (APP-23) is set to ‘0’.
[Sleep Operation]
APP
►
Regul Bypass
22 --- No ---
0 22
Factory Default:
No
0
Output
Frequency
Max. Freq.
Starting
Freq.
RUN
STOP
RUN
STOP
H-min H-max
Water Level in
a Tank
Main Motor
Aux. Motor
APP
►
Sleep Delay
23 60.0 sec
60.0 23
Factory Default:
60.0 sec
60.0
APP
►
Sleep Freq
24 19.00 Hz
19.00 23
Factory Default:
19.00 Hz
19.00
APP
►
WakeUp level
25 35 %
35 25
Factory Default:
35 %
35
Actual Value
Time
Time
t<APP23
Sleep delay
(APP23)
Stop Start
Wakeup level
(APP25)
Sleep freq
(APP24)
Main
Motor
Output Frequency