Chapter 6 - Parameter Description
6-4
SET Low Limit
13 30.00 Hz
SET High Limit
14 60.00 Hz
Max. Hz. It will take 10sec to accelerate from 20Hz
to 30Hz with ACC set to 60sec. and max. speed set
to 60Hz.
If parameter FG1-73 is set to
Delta Frequency
,
the ACC or DEC time will be applied from Current
Speed Reference to new Speed Reference. It will
take 60sec to accelerate from 20Hz to 30Hz with
ACC set to 60sec. and max. speed set to 60Hz.
The VFD can trip on ETH (Electronic
Thermal) motor overload protection if ACC time is
set to very low value.
The VFD can trip on Over Voltage protection
because of regenerative power from the motor if
DEC time is set to very low value.
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The VFD has High and Low limit settings for the
output frequency in both Remote and Local control
modes. The PID control mode has separate output
frequency limit settings. When VFD speed
reference is set below Low Frequency limit or
above High limit, the VFD output will stay at
frequency limit. The minimum recommended low
limit frequency is 20Hz which should be sufficient
to provide adequate air flow for motor cooling.
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The SET-15 parameter
has three selections:
•
None
-motor can run Forward and Reverse
directions
•
Forward Prev
.- motor can run Reverse
direction only
•
Reverse Prev
.- motor can run Forward direction
only
For most of the applications the factory default
setting is
Reverse Prev.
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The SET-16 parameter
has four selections:
•
Decel
- the VFD will decrease output
frequency from current speed reference to
0Hz based on SET-12 parameter setting
after a stop command was received
•
DC-brake
- the VFD will inject DC current in
motor winding during deceleration after stop
command was received and output
frequency is below FG1-25 setting. DC
injection brake provides a faster stop for the
motor but it generates heat in the motor
winding and depending on settings in
parameters FG1-21~27 and braking duty
cycle the motor can be overheated.
•
Coast
- the VFD will stop generating any
output upon receiving a stop command. The
motor will coast to stop without any control
from VFD similar to opening the contactor
of a motor starter.
•
Flux Brake
- the VFD provides a faster stop
for the motor by magnetizing it with
regenerative power and dissipating this
energy as heat in the motor windings.
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The SET-20 parameter
enables the internal PID
control. The PID control allows the VFD to
maintain a process value (pressure, temperature
etc.) by varying the output frequency based on the
difference between a set point and actual feedback
value. When this parameter is set to Yes, the PID
parameters SET-21~31 become available. Refer to
page 7-1 for PID control diagram
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The SET-21 parameter
has three selections:
•
I
- 4-20mA analog signal from transducer or
other sensor
•
V1
- 0-10VDC analog signal from transducer
or other sensor
•
Pulse
- pulse frequency signal from counter,
encoder or other pulse generating device
The feedback signal is an actual process value and
PID will compare it to a set-point value in order to
adjust VFD speed.
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The SET-22 parameter
has following selections
for feedback unit: PSI,°F, °C, inWC, inM
(Mercury), Bar, mBar, Pa, kPa and Custom. The
custom unit can be used to show an actual value for
line speed, liquid or air flow, or other units
depending on type of transducer used for feedback
monitoring.
SET Run Prev.
15 Reverse Prev.
SET Stop Mode
16 Decel
SET PID Mode
20 Yes
SET PID F/B
21 I
SET F/B Unit
22 PSI
Summary of Contents for CI-007-P2
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Page 111: ...Chapter 6 Parameter Description 7 4 7 5 PID control with Pre PID function diagram...
Page 112: ...Chapter 6 Parameter Description 7 5 7 6 PID Control Setting Notes...
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