Siemens MICROMASTER 420 Reference Manual page 11

4. A Dual In-line Package (DIP) switch is used to select North American Defaults.
DIP switch 2 located under the SDP selects North American defaults when set to
'on' (up). Next switch 'on' will set 60 Hz etc. P0100, settings 0 and 1 will be
overwritten by DIP switch 2.
Do not change DIP switch 1 from 'off'.
5. The BOP has an additional button to MM3, a function button (Fn). This has several
functions:
a. If a fault occurs and the drive trips, pressing the Fn button will reset the
fault.
b. After reading or accessing a parameter (e.g. P1210), pressing the Fn
button will return the display to r0000, saving scrolling time.
c. If the output frequency is displayed and Fn pressed for approximately one
second, the DC link voltage is displayed. Short presses toggle though
output current, output voltage, output frequency. A long press returns to
original display.
d. When changing parameter values, pressing the Fn button and using the
arrows will allow individual digits to be accessed for easy setting of least
significant digits.
6. The parameter structure is completely different. Parameters are logically grouped;
e.g. P0700 to P0799 are control I/O functions.
a. Parameter access levels are controlled by parameter P0003; e.g. Level 2
gives access to a similar number of parameters as MM3.
b. Parameter P0004 allows access to parameter groups; e.g. P0004 = 3
allows motor data parameters to be accessed and changed.
c. Setting parameter P0010 = 1 enters a 'quick commissioning' mode which
enables key parameters to be set and motor data automatically calculated.
(See the Getting Started Guide for detailed information on 'Quick
Commissioning').
With P0010 = 1, the drive will not run.
d. Some parameters (P0100, Motor parameters etc.) can only be changed
when P0010 =1.
e. Setting Parameter P0010 = 30 and then P0970 = 1 resets factory
parameters to default (except North American defaults).
f. Parameter P0100 = 0 or 1 allows the DIP switch (see above ) to be read.
g. Parameter P1910 and P3900 calculate the motor parameters, like P088 on
MM3. This is important on MICROMASTER 420 and is part of the quick
commissioning. If the Binary Connectors (BiCo) settings of the digital
inputs are enabled by setting P0701, 2 or 3 to 99, the only way to clear
them is to reset all parameters using P0970. (BiCo details are contained in
Chapter 2, Engineering Information)
7. There are important differences in the implementation of the USS protocol. It will
be necessary to change the control messages used to control the
MICROMASTER 420. (See Chapter 3, Communications).
MICROMASTER 420 Reference Manual
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