Siemens MICROMASTER 420 - Page 67

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MICROMASTER 420 Reference Manual
Issue A1
59
3.3.16 Using BiCo with USS
The additional BiCo functionality can be used to achieve greater flexibility when
controlling the inverter of USS. As was discussed earlier, the MICROMASTER 420
can operate with a PZD length defined by the user in P2012. This means that
either one or two control words can be sent from the USS master.
If using a single control word (P2012 = default setting = 2), the meaning of the
control bits is fixed. However Bit 12 has no assigned function. This can be
connected to a function if the user wishes to do this.
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Using USS control with a single control word the user wishes to switch between
slow and fast ramp times. This can be achieved by connecting Bit 12 of the control
word to the source of JOG ramp time selection (P1124)
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P0003 = 3 user access level.
P0700 = 5 control via RS485.
P1060 = JOG ramp up time.
P1061 = JOG ramp down time.
P1120 = normal ramp up time.
P1121 = normal ramp down time.
P1124 = 2036.12 (connects bit 12 of RS485 control word).
P2012 = 2 default setting.
With P2012 set to 4, a second control word is possible and the individual bits of
this control word can be connected to the source of individual functions.
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If RS485 is being used Bit 9 of the second control word could be used to enable
DC braking as follows:
P0003 = 3
P0700 = 5
P1230 = 2037.9
P2012 = 4
1RWH:
While none of the functions of the second control word are preconnected, we
recommend using the following bits for the following functions as this corresponds
to the description of the second control word displayed in r0056
Bit 0 Fixed frequency selection bit 0.
Bit 1 Fixed frequency selection bit 1.
Bit 2 Fixed frequency selection bit 2.
Bit 8 PID release.
Bit 9 Enable DC braking.
Bit13 External fault.
The remaining bits can be connected as desired.