Hitachi SJ300 Series - Manual (Page 38)

Chapter 4 – Adjustment
4.5 Adjustment of Ride Quality, Brake Timing and Acceleration Time
You can check the ride quality by observing the torque monitor signal. A torque curve
with a trapezoidal shape is ideal, as shown in Figure 2.2. Then further fine-tuning should
be done by actually riding the elevator. Points to be concerned with are:
1. Does shock occur when the brake is released? At that moment, how does motor axis
rotate? Check that the timing of a brake is accurate. Does torque respond quickly
enough?
2. Is the ride comfortable during at acceleration and deceleration? Tune the rates and
amount of deviation for acceleration and deceleration.
3. Does shock occur when the brake closes? At that moment, how does motor axis
rotate? Check that the timing of the brake engagement is accurate. Is the
deceleration time from creep speed too short?
For using the brake control signal, refer to Chapter 2, Section 2.7.
Relative to brake control, two typical conditions are shown below.
(Example 1) Time chart when utilizing the brake control signal.
Brake OFF
frequency (b127)
Waiting time for
acceleration
Brake waiting time for
release (b121) Output
frequency (Hz)
Delay time (b128)
Time
Running command
(FW/RV)
Brake releasing
output (BRK)
Brake confirmation
signal (BOK)
Releasing
frequency (b125)
Waiting time
for stop (b123)
Waiting time for signal
confirmation Waiting time for signal
confirmation
・ The brake release signal (BRK) becomes active when both the brake release frequency (b125) and
the brake release current (b126) conditions are satisfied.
・ When above condition is satisfied, it is assumed to take the brake waiting time for release (b121) for
inverter and motor to be energized.
・ brake wait time for acclerelation (b122) is:
(a) When not using the brake confirmation signal (BOK), this is the time lag from output of brake
release siganal to actual release of the brake.
(b) When using brake confirmation signal (BOK), this is the time lag from receiving BOK until
brake has actually released. Therefore, under the case of (a) , it is required that the brake wait
time for acclerelation(b122) should be longer than the time in which actually brake has been
released. Under the case of (b), since the brake has been already released, brake wait time for
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