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Diagnostics Optimization CT MODBUS RTU Technical Data
254 Installation and System Design Guide
Issue Number: 1
9.15 Elevator Software Machine State
The state machine within the Elevator control software handles the general sequencing for the E300 Elevator drive in the Elevator system such that
the drive will be in a known defined state during operation. The defined states will include for example the following;
•Idle
• Control sequencing
• Contactor control
• Motor control
• Brake control
• Profile control
• Start, travel, decelerate creep, stop
The state machine and its control states are sequenced based upon the Elevator controller signals to the drive, via the terminal interface and
dependant upon the drive configuration. During operation the active states will be displayed as shown in the table following.
Table 9-13 State machine and control state
State Description
0 Idle (wait for travel request):
Wait for the start of travel.
Start Speed Selection Filter (F68) is active prior to any speed and direction selection being made to start a travel. This filter is active to prevent
system induced control noise from spuriously starting a travel and can be user adjusted.
Provided Motor Contactor Monitoring Enable (B29) and Brake Contact Monitoring Select (D11) > None (0), check the state of Motor Contactor
Monitoring Input (B30) and the Brake Contact Monitoring Input 1 (D12), Brake Contact Monitoring Input 2 (D13), Brake Contact Monitoring
Input 3 (D30) and Brake Contact Monitoring Input 4 (D31). Create trips if any of the monitored inputs are in an incorrect state. The motor contactors
should be open, but if it is closed call a Motor Contactor trip indicating an incorrect state. The brake contacts should be open, but if they are closed
and Brake Contact Monitoring Select (D11) > None (0), call a Brake Contact trip indicating an incorrect state.
Brake Contact Monitoring can be enabled to support Unintended Car Movement whilst the Lift car is within the door zone, this Brake Contact
Monitoring if enabled is active during this state and where a brake contact fault is present the drive will be tripped with a Brake Contact trip and
further operation is prevented
The output motor contactors should be open in State 0 (Idle), if these are closed call a Motor Contactor trip indicating incorrect output motor
contactor control.
Write the output motor contactor and motor brake control outputs = Off (0).
To Exit State 0 (Idle):
One of the following conditions must have been met:
• Drive OK (L05) = On (1).
• A speed reference has been selected and a direction input has been received (if dual direction inputs are used).
• A speed reference has been selected if single direction input is used.
• If the Safe Torque Off, Drive enable and Fast disable (if used) are received (speed and direction not required).
• If Fast start Fast Start Enable (H20) = On (1)
On Exit To State 1 (Wait for STO):
• Close the output motor contactors via Motor Contactor Control Output (B31).
1
Wait for Safe Torque Off (STO):
Wait for the Safe Torque Off, Drive enable and Fast disable (if used) inputs to be applied, and when all inputs are received.
• It is assumed that the Safe Torque Off, Drive enable and Fast disable (if used) are either routed via the output motor contactors auxiliary
feedback (24v signal) or a buffered version of this.
• In systems with “zero output motor contactors” the Safe Torque Off, Drive enable and Fast disable (if used) are derived from the zero output
motor contactor control circuit safety relays.
If the Enable is not received within 6 s call either a Fast Disable Err trip or STO Ctrl Err trip as appropriate. Call Fast Disable Err trip if
Fast Disable (B27) and Safe Torque Off, Drive enable are not received in time, or call STO Ctrl Err trip if the Safe Torque Off, Drive enable is not
received in time.
If Motor Contactor Monitoring Enable (B29) = On (1), and Motor Contactor Monitoring Input (B30) = Off (0) after 6 s with output motor contactor
monitoring enabled call a Motor Contactor trip indicating the output motor contactors are open and should be closed.
Exit To State 2 (De-bounce output motor contactors):
• When Safe Torque Off, Drive enable and Fast disable (if used) inputs are received.
• De-bounce time active for output motor contactor control coming from either the drive of Lift controller
Exit To State 14 (Open output motor contactors):
• If the speed reference is removed
• If the direction signal is removed (in dual direction input mode), and the Inspection speed is not selected (Inspection Speed Selector (G53))
• If the direction signal has changed (in single and dual direction input modes), and the Inspection speed is not selected (Inspection Speed
Selector (G53))
• If the drive trips
• If the control word is enabled (Control Input mode (H11) >= Control Word (6)), and the control word enable bit13 = Off
Note that when the inspection speed is selected, configured by Inspection Speed Selector (G53), the direction may change or be deselected, and
speed may change from no speed selected to Inpsection speed selected during the start of travel to accomodate manual Inspection travel selection.
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