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Operation
7.3.1 State "Init" (Initialisation)
Controller reboot and transition 'Error Reset' out of state
'Fault Discharged' places the state machine into state 'Init'.
In this state, the process is initialized and the supply
voltages are checked. The controller is reset if an NMT
reset (reset node or reset communication) has been
received in this state.
Transitions:
•
Into state 'Fault Charged' if hazardous voltage is
detected inside the connection box, determined
by measuring U
•
Into state 'Fault Discharged' if the 24 V and 5 V
CAN power supplies can't be found by reading
7
7
the digital inputs.
•
Into state 'Voltage Disabled' if the NMT state
machine has finished its initialization and the 24
V and 5 V CAN power supplies are good.
7.3.2 State "Voltage Disabled"
This is the nominal unpowered state. U
detached from the intermediate circuitry and the capacitor
battery is not charged. Devices connected to the lines are
not powered. The controller is reset if an NMT reset (reset
node or reset communication) has been received in this
state.
If auto power up is configured in the user configuration
and all required conditions are met, the state machine
carries out a transition 'Switch On' and proceeds to state
'Power Up.
Transitions:
•
Into state 'Power Up' following a 'Switch On'
transition request (either through user command
or configuration of the auto power up flag).
Required checks:
-
-
-
-
38
®
VLT
.
ZK
input supply is
DC
Improper supply voltages (24 V and/or 5
V CAN supplies) lead to a warning and
the state is not changed.
Out of nominal range input voltage
(U
) leads to a warning and the state is
DC
not changed.
Improper heat sink temperature leads to
a warning and the state is not changed.
Improper safety supplies lead to a
warning but allow the transition into
state 'Power Up' to allow operation
MG75G102 - VLT
ISD Connection Box Operating Instructions
•
Into state 'Fault Charged' if hazardous voltage is
detected inside the connection box, determined
by measuring U
7.3.3 State "Fault Discharged"
This is the unpowered fault state. This state can either be
left through a 'Reset Error' transition, which restarts the
state machine, or through an NMT reset (reset node or
reset communication), which resets the controller.
Transitions:
•
Into state 'Init' following a 'Reset Error' transition
user request.
•
Into state 'Fault Charged' if hazardous voltage is
detected inside the connection box, determined
by measuring U
7.3.4 State "Power Up"
This state charges the internal capacitor battery.
Connected devices are not placed into operating state
while charging the capacitors. When the battery is
charged, the charging resistor is bypassed. If the discharge
resistor check flag is set in the user configuration, the
resistor is checked for correct operation during this state. If
the verification fails, an error is issued and the transition to
state 'Fault Charged' is initiated.
Transitions:
•
Into state 'Power Down' following a 'Switch Off'
transition user request or following an NMT reset
(reset node or reset communication) command.
•
Into state 'Operation Enabled' if the capacitor
battery is charged, determined by measuring the
intermediate circuitry voltage U
•
Into state 'Fault Charged':
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-
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®
is a registered Danfoss trademark
without safety supplies. Both safety
supplies are checked and memorised for
comparison. The loss of any safety
supply in any charged state is irregular
and leads to an emergency warning.
.
ZK
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ZK
.
ZK
If the capacitors can't be charged within
the typical time limit to protect the
charge resistor.
If the intermediate circuitry voltage (U
is greater than the input voltage (U
If the input voltage drops below or
exceeds the absolute limits.
)
ZK
).
DC
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