Siemens MICROMASTER 420 - Page 66

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MICROMASTER 420 Reference Manual
58 Issue A1
Table 3-8 Comparison Table (MICROMASTER 420/Earlier MICROMASTER)
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00 00 00YDOXH
Bit 0 ON (Ramp-up)/ OFF1 (Ramp-down). Same as MM3.
Bit 1 OFF2: electrical stop. Same as MM3.
Bit 2 OFF3: Fast stop. Same as MM3.
Bit 3 Pulse enable. Same as MM3.
Bit 4 Ramp function Generator (RFG) enable. Same as MM3.
Bit 5 RFG start. Same as MM3
Bit 6 Setpoint enable Same as MM3.
Bit 7 Fault acknowledge. Same as MM3.
Bit 8 Jog right. Same as MM3.
Bit 9 Jog left. Same as MM3.
Bit 10 Control from PLC. Same as MM3.
Bit 11 Right direction. Setpoint inversion 0 run right.
1 run left.
Bit 12 Left direction. Not used.
Bit 13 Not used. Not used.
Bit 14 Not used. Not used.
Bit 15 Not used Not used.
Using MICROMASTER 420 as a replacement for MM3 on an existing machine,
setting P1820 = 1 (reverse output phase sequence) will allow the inverter to be
operated with the existing control word.
The frequency will be displayed as negative for clockwise rotation (RUN RIGHT) in
this case.
According to USS protocol, the functions of bits 11 to 15 are user defined. This
brings MICROMASTER 420 in line with all future Siemens products.
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MM3 parameter P95 “USS Compatibility” setting
can be achieved by setting
P2009 = 1 (level 3, see previous section).
3.3.14 Reading and Writing Parameters
This is no longer compatible with previous MICROMASTER products. Apart from
different parameter numbers, many of the parameter values now use IEEE float
format, which necessitates the use double word parameter values and thus
requires a longer PKW part of the telegram. This brings MICROMASTER 420 in
line with other Siemens inverters such as MasterDrive.
3.3.15 Broadcast Mode
MM3 operated with a 3 word PKW only. For this reason the PKW area
requirement for broadcast mode was not implemented and it was actually possible
to change parameter values on all slaves using a broadcast telegram.