88 Functional Description Emotron AB 01-3694-01r2
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 acceleration
time for the MotPot up command. The acceleration time is
defined as the time it takes for the motor potentiometer
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 deceleration
time for the MotPot down command. The deceleration 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 is used in an application, 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 prevent water hammer due to rapidly exhaust-
ing air from the pipe system.
If a Minimum speed is programmed, this will be the acceler-
ation time from 0 rpm to the minimum speed at a run com-
mand and defined as the time it takes for the motor to
accelerate from 0 rpm to nominal motor speed.
Communication information
Fig. 74
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.
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
333 Acc MotPot
Stp 16.0s
A
334 Dec MotPot
Stp 16.0s
A
Modbus Instance no/DeviceNet no: 43104
Profibus slot/index 169/8
Fieldbus format Long, 1=0.01
Modbus format EInt
Default: 10.0 s
Range: 0.50-3600 s
Modbus Instance no/DeviceNet no: 43105
Profibus slot/index 169/9
Fieldbus format Long, 1=0.01
Modbus format EInt
335 Acc>Min Spd
Stp 10.0s
A
time
rpm
Nom.Speed
Max speed
Min speed
[335]
[331] [332]
[336]
[341]
[343]
[225]
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