2 Installation and Wiring
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75
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2.4.2 Slow-Down Switches
The slow-down switch is one of the key protective means of the elevator, protecting the elevator
from over travel top terminal or over travel bottom terminal at maximum speed when the elevator
position becomes abnormal. The NICE3000
new
system supports a maximum of three pairs of slow-down
switches. The slow-down switch 1, slow-down switch 2 and slow-down switch 3 are installed from the
is required for the low-speed elevator. Two or three pairs of slow-down switches are required for the
high-speed elevator.
The slow-down distance L indicates the distance from the slow-down switch to the leveling plate at the
The default value of F3-08 (Special deceleration rate) is 0.9 m/s
2
. The slow-down distances calculated
Rated
Elevator
Speed
(m/s)
0.25 0.4 0.5 0.63 0.75 1 1.5 1.6 1.75 2 2.5 3 3.5 4
Distance
of Slow-
down 1
(m)
0.4 0.4 0.4 0.4 0.4 0.7 1.5 1.7 2.0 2.0 2.0 2.0 2.0 2.0
Distance
of Slow-
down 2
(m)
None None None None None None None None None 2.5 4.0 4.0 4.0 4.0
Distance
of Slow-
down 3
(m)
None None None None None None None None None None None 6 8 11
"V" indicates the elevator speed, and precautions on the actual installation distance are as follows:
◆
V < 1 m/s: The actual installation distances of the slow-down switches should be close to the values
recommended in this table.
◆
within ±0.1 m based on the values recommended in this table.
◆
within ±0.3 m based on the values recommended in this table.
◆
The slow-down distances above are calculated on the basis of the default special deceleration
rate 0.9 m/s
2
.
◆
Decreasing the acceleration rate and deceleration rate and increasing the special deceleration
hazard. If any change is in need, re-calculate the slow-down distance by using the above
formula.
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