CERUS CI-007-P2 - Parameter Description - Function Group 1; Acceleration and Deceleration Patterns; S-Curve Start and End Segments; Motor Pre-Heat Mode

Chapter 6 - Parameter Description
6-12
FG1  Acc. Pattern
01 Linear
FG1 Dec . Pattern
02 Linear
FG1  Start Curve
03 25%
FG1  End Curve
04 25%
6.3 Function Group 1 [FG1]
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The FG1-00 parameter
allows jumping to any
parameter in FG1 group without scrolling to it.
Press [ENTER] key and input desired parameter
code by using [SHIFT] and [UP]/[DOWN] keys.
When [ENTER] key is pressed again, the desired
parameter will be on the display.
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The FG1-01and FG1-02 parameters have following
selections for acceleration pattern: Linear, S-Curve
and User-Curve.
The Linear Curve provides linear relation between
VFD output frequency and time. The maximum and
minimum frequency limits are set in SET-13 and
SET-14.
The S-Curve provides non-linear relation between
VFD output frequency and time. The maximum and
minimum frequency limits are set in SET-13 and
SET-14. This pattern allows the motor to accelerate
and decelerate smoothly. The actual acceleration
and deceleration time will be about 40% longer
than the time set in SET-11 and SET-12.
The S-Curve prevents mechanical shock of the
equipment during acceleration and deceleration
modes.
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The U-Curve provides slower acceleration or
deceleration from beginning to about 2/3 of the
SET-13 ACC Time and SET-14 DEC Time.
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The FG1-03 parameter is a percentage of the Delta
Frequency (from current to new reference) and it
determines the ACC time at the beginning and end
of the S-Curve for the acceleration pattern. The
FG1-04 parameter is a percentage of the Delta
Frequency and determines the DEC time at the
beginning and end of the S-Curve for the
deceleration pattern. The segment of the S-Curve
between Start curve and End curve is linear.
Example: If FG1-03 is set to 25% and speed
changes from current 20Hz to new 40Hz, the linear
segment between them will be 50% of 20Hz
(Delta=40Hz-20Hz).
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The Pre-Heat Mode
allows the motor to be
heated during VFD stop mode to protect it from
moisture accumulating in the windings. The VFD
generates DC voltage pulses in the motor windings
and heats it to some level based on settings in FG1-
11 and FG1-12. If FG1-10 is set to Yes, the Pre-
Heat Mode is enabled and parameters FG1-11 and
FG1-12 are available. The Pre-Heat mode will be
activated by any digital input programmed for Pre-
Heat and deactivated when input is off. When VFD
activates Pre-Heat mode, the screen will show
flashing message “PreHeat”.
FG1  Jump Code
00 70
Output Frequency
Time
Acc. Pattern Dec. Pattern
Deceleration Time Acceleration Time
End %
Start %
End %
Max freq.
S starting
Time (sec)
Start %
S ending
S ending
S starting
Linear
Linear
0
Steady
FG1  PreHeat Mode
10 Yes
Output Frequency
Ti
me
Acc. Pattern Dec. Pattern