6-14
6
îš„Brake Sequence without torque compensation at start
To use the brake sequence without torque compensation at start,
• the Terminal A1 function must be set to 0 (H3-15 = 0, speed reference input)
• the AI-14B Ch2 and Ch3 input functions must not be set to 14. (H3-05/09 ≠14, torque reference not
selected)
The figure below shows the timing chart for this brake sequence.
Fig 6.2 Timing chart of Brake sequence without torque compensation at start
The timing chart above is divided in time zones. The following table explains the sequence in each time zone.
Timing Description
t1
The inverter gets the direction signal (UP/DOWN)
The inverter gets the hardware base block disable signal (Not BB condition).
The inverter receives the speed reference signal.
The inverter sets the contactor closed signal.
The inverter waits for the contactor confirmation signal. If no digital input is set to contactor confirmation
signal (H1-=86), the sequence is proceeded after exceeding the operation start delay time (S1-16).
t2
When the RUN delay time (S1-16) has elapsed, DC injection (Open Loop) or zero servo operation (position lock in
Closed Loop) is started.
When the brake open delay time (S1-06) has elapsed, the inverter sets the brake open command.
t3
The inverter keeps DC injection/zero speed operation until
* the time S1-04 – S1-06 has elapsed if S1-06 < S1-04 or
* the time S1-06 has elapsed if S1-06 > S1-04 (try to avoid this setting since the motor could be driven against the brake)
t4 The speed is increased to the selected speed and is kept constant until the leveling speed is selected.
t5
The speed is decreased to the leveling speed and is kept constant until the stop signal is given (depending on d1-18 either
by removing the direction signal, by removing the leveling signal or by deleting the speed inputs, see page 6-5, Speed
Selection Sequence Using Digital Inputs)
t6 The speed is decreased to the zero speed level.
t7
When the zero speed level is reached (S1-01), the DC injection (Open Loop) or zero servo operation (position lock in
Closed Loop) is applied for the time set in S1-05.
When the brake close delay time (S1-07) has elapsed, the brake open command is removed.
t8
The inverter continues DC Injection (Open Loop) or zero speed operation (Closed Loop) until the time S1-06 – S1-07 has
elapsed. After that the inverter output is shut down and the hardware base block signal must be set.
t9 After the output contactor open delay time (S1-19) has elapsed, the output contactor close signal is removed.
RUN
Inverter Hardware BB D/I
Contactor Control D/O
Contactor Confirmation D/I
Brake Open Command
t1 t2 t3 t4 t5 t6 t7 t8 t9
Speed
S1-04
Zero servo/
DC Injection
at start
S1-16
RUN delay time
Selected Speed
Leveling Speed
S1-05
Zero servo/
DC inhection
at stop
S1-07
Brake close
delay time
S1-19
Contactor open delay
S1-06
Brake open
Delay time
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