NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
128
BU 0200 en-US-4920
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Bus I/O bits
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WARNING
Unexpected movement due to automatic starting
In the event of a fault (communication interrupted or bus cable disconnection), the device
automatically switches off since the device enable is no longer present.
Restoration of communication may result in an automatic start and hence unexpected movement of
the drive unit. To prevent any hazard, a possible automatic start must be prevented as follows:
• If a communication error occurs, the bus master must actively set the control bits to zero.
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Initiators can be directly connected to the digital inputs of the variable frequency drive. Actuators can
be connected via the available digital outputs of the device. The following connections are each
provided for four reference data bits:
BUS-IN
Function (P480[-01…-04])
Status
Status
Bit 1 Bit 0
Bit 0
Enable right
0
0
Motor is switched off
Bit 1
Enable left
0
1
Field of rotation right present in motor
Bit 2
Fixed frequency 2 (
P465[-02])
1
0
Field of rotation left present in motor
Bit 3
Acknowledge fault
1)
1
1
Motor is switched off
1)
Acknowledge with flank 0
1.
For control via the bus, acknowledgement is not
automatically performed by a flank on one of the enable
inputs
BUS-OUT
Function (P481 [-01 … -04])
Status
Status
Bit 1 Bit 0
Bit 0
Inverter ready
0
0
Error active
Bit 1
Warning
0
1
Warning
Bit 2
1)
Digital-In 1 status
1
0
Starting disabled
Bit 3
1)
Status dig In 2
1
1
Ready for operation
1)
Bits 2 and 3 are directly coupled to digital inputs 1 and 2
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The configuration of the I/O bits can also take place within a limited scope via DIP-switch S1: 3, 4 and
5 (
Section 4.3.2.2 "DIP switches (S1)").
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Parallel actuation via the BUS and the digital inputs is possible. The relevant inputs are dealt with
more or less as normal digital inputs. If a changeover between manual and automatic is going to take
place, it must be ensured that no enable via the normal digital inputs takes place in automatic mode.
This could be implemented e.g. with a three-position key switch. Position 1: "Manual left" position 2:
"Automatic" position 3 "manual right".
If an enable is present via one of the two "normal" digital inputs, the control bits from the bus system
are ignored. An exception is the control bit "Acknowledge fault". This function is always possible in
parallel, regardless of the control hierarchy. The bus master can therefore only take over control if no
actuation via a digital input takes place. If "Enable left" and "Enable right" are set simultaneously, the
enable is removed and the motor stops without a deceleration ramp (block voltage).
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