Siemens SED2 User Manual download pdf (Page 84)

SED2 VFD Parameter Reference Guide

76 Siemens Building Technologies, Inc.

P1203 Search rate: Flying start Level 3

Min: 10 Def: 100 Max: 200

Unit: %

Details:

Sets factor by which the output frequency changes during flying start to

synchronize with turning motor. This value, is entered in % relative to the default

time factor, defines the initial gradient (and thus influences the time taken to

search for the motor frequency):

The search time is the time taken to search through all frequencies between

f_max + 2 × f_slip to 0 Hz.

P1203=100% is defined as giving a rate of 2% of f_slip,nom/ms.

P1203=200% would result in a rate of frequency change of 1% of f_slip,nom/ms.

Example:

For a motor with 50 Hz, 1350 rpm, 100% would produce a maximum search time

of 600 ms. If the motor is turning, the motor frequency is found in a shorter time.

Note:

A higher value produces a flatter gradient and thus a longer search time. A lower

value has the opposite effect.

P1210 Automatic restart Level 3

Min: 0 Def: 1 Max: 5

Unit: -

Details:

Enables restart after a supply power break or after a fault.

Enum:

0 Disabled

1 Trip reset after power on P1211 disabled

2 Restart after supply power blackout P1211 disabled

3 Restart after brownout or fault P1211 enabled

4 Restart after supply power brownout P1211 disabled

5 Restart supply power after blackout or fault P1211 disabled

Dependency:

Auto restart requires constant ON command (such as via a digital input wire link).

CAUTION:

Settings 2 to 5 can cause the motor to restart unexpectedly.

Note:

P1200 flying start must be used in cases where the motor may still be turning

(such as after a short supply power break) or can be driven by the load.

A supply power brownout is when the power is interrupted and reapplied

before the operator panel display has gone dark. It is a very short supply power

break where the DC link has not fully collapsed.

A supply power blackout is when the operator panel display has gone dark

before the power is reapplied. It is a long supply power break where the DC link

has fully collapsed.

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Siemens SED2 User Manual Page 84

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