CSD Series
Variable Frequency AC Drive
MOTORTRONICS
- 48 -
Overtorque Control
Fn77 - Fn79 define the characteristics of the drive’s overtorque control.
The drive will detect an overtorque condition if the motor current is
above the detection level defined by Fn78 for the time defined by Fn79.
Fn77 = Overtorque Control - Factory Setting = 0000
The first digit defines whether overtorque detection is to be enabled or
disabled.
XXX0:
Overtorque detection disabled
XXX1:
Overtorque detection enabled
The second digit defines whether overtorque detection is active only
when drive is running at constant speed or if overtorque detection is
always active regardless of whether the drive is accelerating,
decelerating or at constant speed.
XX01:
Enabled only if at set frequency (running at constant speed)
XX11:
Enabled during operation (during acceleration, deceleration or
constant speed)
The third digit defines whether drive operation is to be stopped or
continued after an overtorque condition has been detected.
X0X1:
Operation continued after overtorque is detected - (the drive will
continue to run and the keypad will start blinking OL3 until output
current is lower than Fn78 setting.)
X1X1:
Free run to stop after overtorque is detected (- the drive
baseblocks immediately and the display blinks OL3. To start running,
press RESET key or turn on remote control RESET terminal.)
Fn78 = Overtorque detection level - Factory Setting = 160%;
Range = 30 - 200%
Fn79 = Overtorque detection time - Factory Setting = 0.1 sec.;
Range = 0 - 25 sec
Note: When Fn61 = 05 (N.O.) or 11 (N.C.) the multifunction output
terminal (TM2-11) functions as an overtorque detection output.
Overtorque detection output signal is available only if overtorque
function is enabled (Fn77 = XXX1).
S-Curve Parameters
An S-curve function is available. The S-curve function provides a smooth
ramp into and out of the accel/decel mode. It lessens the mechanical
shock to the systems when a change of speed command is performed
by the drive.
Fn80 = S-curve time 1 in the period of Accel/Decel time 1 -
Factory Setting = 0.2 sec.; Range = 0 - 4 sec.
Fn81 = S-curve time 2 in the period of Accel/Decel time 2 -
Factory Setting = 0.6 sec.; Range = 0 - 4 sec.
Program Fn80 and Fn81 to the time required by the application to
ramp into and out of the accel/decel rate. A setting of 0 disables the S-
curve. The total accel/decel time will increase by the values programmed
into Fn80 and Fn81. S-curve 1 or 2 can be controlled by a control
signal from the external input terminal (Tm2 pins 6,7 or 8) as long as
Fn56 - Fn58 is programmed as a 4 (N.O.) or 20 (N.C.).
Содержание CSD Series
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