Siemens MICROMASTER 420 Reference Manual

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MICROMASTER 420 Reference Manual
44 Issue A1
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--- slave node addresses
0 - 31
--- >
Figure 3-3 Address (ADR) Bit Numbers
Bit 5 is the broadcast bit. If it is set to 1, the message is a broadcast message and
will be acted upon by all inverters on the serial link. The node number is not
evaluated. The USS protocol specification requires certain settings in the PKW
area. Refer to the later example on using USS broadcast mode.
Bit 6 indicates a mirror telegram. The node number is evaluated and the
addressed slave returns the telegram unchanged to the master.
The unused bits should be set to 0.
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The BCC field is a byte-sized checksum used to validate messages. It
is calculated by XORing together all the previous bytes in the message.
If the Inverter receives a message with an invalid message it will discard
the message and not send a reply.
3.3.3 Useful Data Characters
The useful data block is divided into two areas, the PKW area (parameter ID –
value area) and the PZD area (process data).
|< --- PKW area --- >| |< --- PZD area --- >|
PKE IND PWE1 PWE2 …… PWEn PZD1 PZD2 ……. PZDn
Figure 3-4 Useful Data Characters
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The PKW area relates to the handling of the parameter ID - value (PKW) interface.
The PKW interface is not a physical interface but a mechanism which handles
parameter transfer between two communication partners (e.g. control unit and
inverter). This involves, for example, reading and writing parameter values.
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The first two words of the PKW area (PKE and IND) give information regarding the
task requested by the master (Task ID) or the type of reply telegram (Reply ID).
They also define the inverter parameter number (PNU) which is being accessed by
the telegram. The PNU number refers to MICROMASTER 420 parameter numbers
e.g. 1082 = P1082 = F
max.
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Bits15-12 AK = Task or reply ID. See below.
Bit 11 SPM = parameter change report. Not supported (always 0).
Bits10-00 b. PNU = basis parameter number. The complete PNU will be built
together with Bits 15-12 from the IND
(index). See below.

Siemens MICROMASTER 420 Specifications

General

Power Range	0.12 kW to 11 kW
Output Voltage	0 to input voltage
Input Frequency	47 Hz to 63 Hz
Output Frequency	0 Hz to 650 Hz
Overload Capacity	150% for 60 seconds
Enclosure Rating	IP20
Input Voltage	200 V to 240 V (±10%), 380 V to 480 V (±10%)
Control Type	V/f control
Braking	Optional braking module
Protection Features	Overcurrent, overvoltage, undervoltage, overload, short circuit, ground fault
Cooling	Air-cooled
Ambient Temperature	-10 °C to +50 °C
Communication Interfaces	USS protocol