Fuji Electric Europe GmbH
Page 19 of 26
9.4.1
APL acceleration/deceleration ramps
ON
E31
ON
E14, E15
ON
Auto Power Limit
U29 (kW)
Power limit
Speed decreased
Time
Speed
High speed
ON
Figure 10: APL details
When input power reaches U29 (kW) level, inverter reduces output frequency until reach desired input
power.
When this function is enabled, two new acceleration/deceleration ramps are enabled in order to improve
comfort (E14, E15). If input power is below U29 level, APL is not activated, so consequently output frequency
(speed) is not limited.
9.4.2
Deceleration holding time during APL
When APL function is activated, output frequency (speed) is reduced according to limit power set. This speed
limit can make a longer creep speed. In order to avoid excessive waiting time, two different deceleration
holding time parameters can be adjusted (U49, U59).
There are two limit zones (Limit 1 and Limit 2). Depending on the output frequency, limit 1 or limit 2 zone is
reached. If output frequency is between upper and lower limit 1 (U44, U45), then deceleration holding time
applied will be U49. If output frequency is between upper and lower limit 2 (U54, U55), then deceleration
holding time applied will be U59. If speed is over upper limit 1 (U44), or below lower limit 2 (U55) then no
holding time is applied.
This delay (holding time) is applied when creep speed or re
-
levelling speed is selected. So, the main idea is
to keep current speed (limited output frequency due to APL) in order to not expend too much time in creep
speed. By means of this function, creep speed time will be almost same independently of car load.
