Siemens MICROMASTER 420 - Page 72

International English 5. SYSTEM PARAMETERS
72 MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
Parameter
Number
Parameter Name
Min
Max
[Default]
Units
♦
♦♦
♦P0003 User
Access Level
♦
♦♦
♦P0004 Setting
♦
♦♦
♦Changeable
♦
♦♦
♦Status
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)
0
f max
(P1082)
P1120
time (s)
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.
0
650
[10]
s
1
10
‘•’
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)
0
f max
(P1082)
P1121
time (s)
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.
0
650
[10]
s
1
10
‘•’