Siemens Micromaster 420 Operating Instruction page 72

International English
Parameter
Number
P1120 Ramp-up time
Time taken for the motor to accelerate from standstill up to maximum motor frequency
(P1082) when no rounding is used.
f (Hz)
f max
(P1082)
0
Setting the ramp-up time too short can cause the inverter to trip (overcurrent).
Notes
If you are using an external frequency setpoint which already has set ramp rates (e.g. from
a PLC), optimum drive performance is best achieved if the ramp times in P1120 and P1121
are set to values slightly shorter than those of the PLC.
Changes to the ramp-up or ramp-down times are not active until confirmed by pressing the
P key.
P1121 Ramp-down time
Time taken for motor to decelerate from maximum motor frequency (P1082) down to
standstill when no rounding is used.
f (Hz)
f max
(P1082)
0
Notes
Setting the ramp-down time too short can cause the inverter to trip (overvoltage (F0002) /
overcurrent (F0001)).
Changes to the ramp-up or ramp-down times are not active until confirmed by pressing the
P key.
72
Parameter Name
P1120
P1121
5. SYSTEM PARAMETERS
time (s)
time (s)
MICROMASTER 420 Operating Instructions
♦ ♦ ♦ ♦ P0003 User
Min
Access Level
Max
♦ ♦ ♦ ♦ P0004 Setting
[Default]
♦ ♦ ♦ ♦ Changeable
Units
♦ ♦ ♦ ♦ Status
0 1
650 10
[10]
'•'
s
0 1
650 10
[10]
'•'
s
6SE6400-5AA00-0BP0