Siemens MICROMASTER 420 - Page 64

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MICROMASTER 420 Reference Manual
56 Issue A1
3.3.10 Basic Setup
If In order to communicate via USS, it is necessary to decide whether the RS485 or
RS232 interface on the inverter is being used. This will determine which index in
the USS parameters are to be set.
P0003
= 2
(necessary to access level 2 parameters).
P2010
= USS Baud rate.
This must correspond to the Baud rate being used by the master.
The maximum Baud rate supported is 57600 Baud.
P2011
= USS Node address.
This is a unique slave address for the inverter.
Once these parameters have been set communication is possible. The master will be able to read and
write parameters (PKW area) and also monitor the inverter status and actual frequency (PZD area).
P0700
= 4 or 5.
This allows control of the inverter via USS.
The meaning of the bits is explained in the section on “PZD area”.
The normal RUN and OFF1 commands are 047F (hex) and 047E (hex) respectively.
Other examples are given in the section on “PZD area”.
P1000
= 4 or 5.
This allows the main setpoint to be sent via USS.
By default this is normalized using P2000 so that 4000 (hex) = the value set in P2000.
It is possible to normalize this differently using P2009 (level 3) for backwards
compatibility with previous inverters.
This will be explained in the next section "Advanced settings".
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P0700 and P1000 are independent of each other and must be set separately as
required
3.3.11 Common advanced settings
P1000
= x4 or x5.
This allows an additional setpoint to be added to the main USS setpoint (see
parameter description for P1000).
P1000
= 4x or 5x.
This allows the USS setpoint to be used as an additional setpoint added to the main
inverter setpoint (see parameter description for P1000).
The following parameters are only available in expert level (P0003 = 3).
P0003
= 3 allows access to expert parameters.
P2009
= USS normalization (compatibility).
The setting 0 gives a frequency setpoint normalization using P2000.
The setting 1 allows the setpoint to be sent as an absolute decimal value (e.g. 4000
dec = 0FA0 hex = 40.00 Hz) for backwards compatibility with previous
MICROMASTER products. The actual value (HIW) in the reply telegram is also
affected.
P2014 = USS telegram off time (ms).
This allows the user to set a time after which the fault F070 is generated if no
telegram is received.
The default setting is 0 ms, which disables the timer.