Grundfos RSI - Page 84

Group 3.3.4: Motor Potentiometer
With a motor potentiometer function, the user can
increase and decrease the output frequency. By
connecting a digital input to parameter P3.3.4.1
(MotPot UP) and having the digital input signal active,
the output frequency will rise as long as the signal is
active. The parameter P3.3.4.2 (MotPot DOWN)
works vice versa, decreasing the output frequency.
The rate how the output frequency either rises or falls
when Motor Potentiometer Up or Down is activated is
determined by the Motor potentiometer ramp time
(P3.3.4.3)
The Motor potentiometer reset parameter (P3.3.4.4)
is used to choose whether to reset (set to MinFreq)
the Motor Potentiometer frequency reference when
stopped or when powered down.
Motor potentiometer frequency reference is available
in all control places in menu Group 3.3: References.
The motor potentiometer reference can be changed
only when the drive is in run state.
Code Parameter Min Max Unit Default ID Description
P3.3.4.1 MotPot UP DigIN Slot0.1 418
FALSE = Not active
TRUE = Active (Motor potentiometer
reference INCREASES until the contact
is opened)
P3.3.4.2 MotPot DOWN DigIN Slot0.1 417
FALSE = Not active
TRUE = Active (Motor potentiometer
reference DECREASES until the contact
is opened)
P3.3.4.3 MotPot Ramp Time 0.1 500.0 Hz/s 10.0 331
Rate of change in the motor
potentiometer reference when increased
or decreased with parameters P3.3.4.1
or P3.3.4.2.
P3.3.4.4 MotPot Reset 0 2 1 367
Motor potentiometer frequency reference
reset logic.
0 = No reset
1 = Reset if stopped
2 = Reset if powered down
8.1.5 Group 3.4: Ramps And Brakes
Group 3.4.1: Ramp 1
Code Parameter Min Max Unit Default ID Description
P3.4.1.2 Accel Time 1 0.1 3000.0 s 5.0 103
Defines the time required for the output
frequency to increase from zero
frequency to maximum frequency
P3.4.1.3 Decel Time 1 0.1 3000.0 s 5.0 104
Defines the time required for the output
frequency to decrease from maximum
frequency to zero frequency
P3.4.1.4 Start Acceleration Time 0.1 3000.0 s 2.0 502 Time from 0 to min frequency
Group 3.4.3: Start Magnetisation
Code Parameter Min Max Unit Default ID Description
P3.4.3.1 StartMagnCurrent 0.00 Varies A Varies 517
Defines the DC current fed into motor at start.
Disabled if set to 0.
84
English (GB)