Siemens MICROMASTER 411 Operating Instructions Manual page 20

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ENGINEERING INFORMATION
This parameter defines the period during which the inverter runs at the minimum
frequency P1080 before ramping up at point 1 (see Figure 3-1). The inverter starts
at the minimum frequency P1080 on this profile, i.e. it does not use a ramp.
P1217 – Holding Time after Ramp Down
Defines the time at which the inverter runs at the minimum frequency after ramping
down at point 2 (see Figure 3-1).
NOTES
Ø The inverter starts at
Ø If this is being used to hold the motor at a certain frequency against a
mechanical brake (i.e. you are using a relay to control a mechanical brake), it
is important that
the relay may not open as inverter is in current limit.
Ø A typical value of
motor.
Ø You can calculate the rated slip frequency by using the following formula:
Where:
calculated using the
20
f
on this profile, i.e. it does not use a ramp.
min
f
< 5 Hz; otherwise, the current drawn may be too high and
min
f
for this type of application is the slip frequency of the
min
n n
−
syn rated
n
syn
n
= Synchronous motor rotation speed. This can be
syn
following formula:
n
=
syn
n
= Rated motor rotation speed (see rating label).
rated
f
= Nominal motor frequency (see rating label).
rated
Electromechanical Brake Control Option
f
x
rated
Rated Frequency 60
x
Number of pole pairs
Operating instructions
6SE6400-5CS00-0BP0
Issue 03/02