M O T I O N
Therefore a fast speed run
cannot
be selected (not enough distance) between these 2 floors.
The required distance for a medium speed run is now checked.
4C(Stm) + 4C(Slm) = 98.
98 is less than A6 so a medium speed run is now selected. Ie, the medium speed is selected when Stf + Slf (B4)
>
the commencing floor run (A6) and Stm + Slm (98)
<
the commencing floor run (A6).
Stf = 5A
Slf = 5A
DISTANCE
SPEED
rated speed
lvl 1
B4. Min distance for fast speed
Stm = 4C
Slm = 4C
98. Min distance for medium speed
A6
Fig 6d.
(Ref. TurboCad – Pulse Graphs)
--------------------------------------------------------------------------------------------------------------
Terminal floors:
BSL and TSL drop out the fast speed relay, which overrides Slf. These limits do not affect medium speed.
Depending on the medium speed, an additional limit at the top and bottom may be required to drop out the
medium speed input to the drive.
If the fast speed slowing is required more than a floor from the terminal floors, additional limits (to the TSL and
BSL) shall be required to drop out the fast speed input to the drive. This is because BSL & TSL must not overlap
other floors. If they did, this would cause the lift to set to a terminal floor before the lift was actually there.
On a correction run the lift shall perform a correction run to the lowest floor unless BSL is off. In some
circumstances the lift may require a correction run just above BSL. In this situation the lift will take off on fast
speed, then get its slow down very soon afterwards, resulting in a very long creep time. The XTM and RTM
settings may be used to overcome this.
