TECO F33 Series, Instruction Manual, Page: 94 / 192

Functional Description 91
Fig. 76 Acceleration and deceleration times
Deceleration Time [332]
The deceleration time is defined as the time it takes for
the motor to decelerate from nominal motor speed to 0
rpm.
Communication information
Acceleration Time Motor Potentiometer
[333]
It is possible to control the speed of the VSD using the
motor potentiometer function. This function controls
the speed with separate up and down commands, over
remote signals. The MotPot function has separate
ramps settings which can be set in Acc MotPot [333]
and Dec MotPot [334].
If the MotPot function is selected, this is the accelera-
tion time for the MotPot up command. The acceleration
time is defined as the time it takes for the motor poten-
tiometer value to increase from 0 rpm to nominal
speed.
Communication information
Deceleration Time Motor Potentiometer
[334]
If the MotPot function is selected, this is the decelera-
tion time for the MotPot down command. The decelera-
tion time is defined as the time it takes for the motor
potentiometer value to decrease from nominal speed to
0 rpm.
Communication information
Acceleration Time to Minimum Speed
[335]
If minimum speed, [341]>0 rpm, is used in an applica-
tion, the VSD uses separate ramp times below this
level. With Acc>MinSpeed [335] and Dec<MinSpeed
[336] you can set the required ramp times. Short times
can be used to prevent damage and excessive pump
wear due too little lubrication at lower speeds. Longer
times can be used to fill up a system smoothly and pre-
vent water hammer due to rapidly exhausting air from
the pipe system.
If a Minimum speed is programmed, this parameter will
be used to set the acceleration time to the minimum
speed at a run command. The ramp time is defined as
the time it takes for the motor to accelerate from 0 rpm
to nominal motor speed.
Default: 10.0 s
Range: 0.50–3600 s
Modbus Instance no/DeviceNet no: 43102
Profibus slot/index 169/6
Fieldbus format Long, 1=0.01 s
Modbus format EInt
NOTE: If the Dec Time is too short and the generator
energy cannot be dissipated in a brake resistor, the
motor is decelerated according to the overvoltage limit.
The actual deceleration time may be longer than the
value set.
rpm
(NG_06-F11)
Nom. Speed
Acc Time [331]
Dec Time [332]
332 Dec Time
Stp 10.0s
A
Default: 16.0 s
Range: 0.50–3600 s
Modbus Instance no/DeviceNet no: 43103
Profibus slot/index 169/7
Fieldbus format Long, 1=0.01 s
Modbus format EInt
Default: 16.0 s
Range: 0.50–3600 s
Modbus Instance no/DeviceNet no: 43104
Profibus slot/index 169/8
Fieldbus format Long, 1=0.01
Modbus format EInt
333 Acc MotPot
Stp 16.0s
A
334 Dec MotPot
Stp 16.0s
A