Nord Drivesystems BU 0500, User Manual

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SK 500E – Users Manual for Frequency Inverters
94 BU 0500 EN-3021
P102
Acceleration time
(Acceleration time)
P
0 ... 320.00 sec
{ 2.00 }
{ 5.00 }
≥
45 kW
The start-up time is the time corresponding to the linear frequency rise from 0 Hz to the set
maximum frequency (P105). If an actual setpoint of <100 % is being used, the acceleration time is
reduced linearly according to the setpoint which is set.
The acceleration time can be extended by certain circumstances, e.g. FI overload, setpoint lag,
smoothing, or if the current limit is reached.
NOTE:
Care must be taken that the parameter values are realistic. A setting of P102 = 0 is not
permissible for drive units!
Notes on ramp gradient:
Amongst other things, the ramp gradient is governed by the inertia of the rotor.
A ramp with a gradient which is too steep may result in the "inversion" of the motor.
In general, extremely steep ramps (e.g.: 0 - 50 Hz in < 0.1 s) should be avoided, as may cause
damage to the frequency inverter.
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P103
Braking time
(Braking time)
P
0 ... 320.00 sec
{ 2.00 }
{ 5.00 }
≥
45 kW
The braking time is the time corresponding to the linear frequency reduction from the set
maximum frequency to 0 Hz (P105). If an actual setpoint <100 % is being used, the deceleration
time reduces accordingly.
The braking time can be extended by certain circumstances, e.g. by the selected >Switch-off
mode< (P108) or >Ramp smoothing< (P106).
NOTE:
Care must be taken that the parameter values are realistic. A setting of P103 = 0 is not
permissible for drive units!
Notes concerning ramp steepness: see parameter (P102)
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P104
Minimum frequency
(Minimum frequency)
P
0.0 ... 400.0 Hz
{ 0.0 }
The minimum frequency is the frequency supplied by the FI as soon as it is enabled and no
additional setpoint is set.
In combination with other setpoints (e.g. analog setpoint of fixed frequencies) these are added to
the set minimum frequency.
This frequency is undershot when
a. the drive is accelerated from standstill.
b. The FI is blocked. The frequency then reduces to the absolute minimum (P505) before it is
blocked.
c. The FI reverses. The reverse in the rotation field takes place at the absolute minimum
frequency (P505).
This frequency can be continuously undershot if, during acceleration or braking, the function
"Maintain frequency" (Function Digital input = 9) is executed.
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