YASKAWA L1000A Technical Manual page 120

4.6 Setup Procedure for Elevator Applications
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Brake Sequence Using Torque Compensation
If a load measuring device is installed in the elevator, an analog input can be used to input a torque compensation value to
the drive. This function requires one of the closed loop control modes (CLV or CLV/PM). To use torque compensation,
one of the analog input terminals must be configured to provide the torque compensation signal (H3-
Figure 4.16 is a timing chart for a brake sequence using torque compensation.
Figure 4.12
S1-10
(Up/Down Command
Delay Time)
Speed
Latch value from analog input
Torque Compensation at Start
Up/Down Command
Safe disable (terminals H1/H2 on)
and Baseblock off (H1- =8/9)
Output Contactor Control
(H2- = 51)
Motor Contactor Response
(H1- = 56)
Brake Control (H2- = 50)
Figure 4.16 is divided into time zones.
Table 4.12 Time Zones for Brake Sequence Using Torque Compensation at Start
Time Zone
Up or Down command is issued.
Safe Disable terminals H1-HC and H2-HC must be set and Baseblock must be disabled (digital inputs set to H1-
Speed reference must be selected by multi-function input terminals.
Output contactor control signal is set (H2-
t1
Drive waits for the "Motor Contactor Feedback" signal (H1-
the feedback signal is on before the contactor control command has been issued, an SE1 fault is triggered.
If the motor contactor feedback signal is not used, then the drive waits for the operation start delay time set in S1-10 to pass, then proceeds to the
next step.
The drive reads the torque value from the analog input (load cell).
After the delay time set in S1-10 has passed, the drive outputs current to the motor. Position Lock begins.
The torque value from the analog input is latched and internal torque compensation value is increased from zero to the latched value using the
t2 time constant set in S3-10.
After the internal torque compensation level reaches the latched value, the drive sets the "Brake Control" output (H2-
the brake.
t3 The brake is released and the drive executes Position Lock until the time set in S1-04 has passed.
The drive accelerates up to the selected speed.
t4 After the torque compensation fade-out speed level (S3-14) is reached during acceleration, the internal torque compensation value is reduced in
accordance with the time constant set in S3-10.
t5 Leveling speed is selected. The drive decelerates to the leveling speed and maintains that speed until the Up or Down command is removed.
t6 The Up or Down signal is cleared. The drive decelerates to zero speed.
The motor speed reaches the zero speed level (S1-01).
DC Injection Braking or Position Lock is then executed for the time set in S1-05.
t7
After the delay time to apply the brake set in S1-07 has passed, the drive clears the "Brake Control" output (H2-
t8 The drive continues DC Injection or Position Lock until the time S1-05 has passed. When S1-05 has passed the drive output is shut off.
After the delay for the magnetic contactor set in S1-11 has passed, the drive resets the output terminal set for "Output Contactor Control" (H2-
t9 = 51).
The Safe Disable Inputs can be cleared and Baseblock can be enabled.
120
S1-04 Selected Speed
(DC Injection/
Position Lock
Time at Start)
S3-14 (Torque
Compensation
Position Lock
Fade Out Speed)
300%Torque
Torque Compensation
Fades Out with S3-10
at S3-14.
S3-10 (Starting
Torque Compensation
Increase Time)
t1 t2 t3
Figure 4.16 Brake Sequence Using Torque Compensation at Start
Table 4.12 explains the sequence in each time zone.
= 51) by the drive.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
d1-26
(Leveling Speed)
t4 t5
Description
= 56) to be issued. If the motor contactor feedback is not received within t1, or if
= 14).
S1-05
(DC Injection
Braking/
S1-11
Position Lock at stop)
(Output Contactor
Position Lock
Open Delay Time)
S1-07
(Brake
Close
Delay
Time)
t6 t7 t8 t9
Enabled
= 8/9).
= 50) in order to release
= 50). The brake applies.