Safety Tests
4-57
4
iControl DC
Terminal Switch Overspeed and Position Faults
The Overspeed Level 1, Level 2 and Position margins are calculated based on the speed and
position values learned during the terminal learn procedure (see “Learning Normal & Emer-
gency Terminal Limit Switches” on page 4-13)
Overspeed level 1 - During passenger (NORM) operation, if car speed exceeds the Overspeed
Level 1 threshold at the time a Normal Terminal switch is activated, an Up (or Down) Normal
Terminal Switch (1-5) Level 1 Speed Fault is detected and an immediate slowdown is initiated
using Emergency slowdown profile parameters. For each Normal Terminal switch, the Over-
speed Level 1 threshold is calculated by increasing the learned speed by a percentage of the
learned speed, e.g. learned speed plus 10% of learned speed. The percentage used in the calcula-
tion is determined by the Overspeed 1 margin parameter. You may adjust the Overspeed Level 1
threshold by changing the Overspeed 1 margin parameter (Configuration > Terminal Switches
tab). The default setting is 8%. Normally, you should not have to adjust this setting.
Sometimes short runs to a terminal, especially one-floor runs, will exceed tightly set overspeed
margins. After you learn terminal switches, it is a good practice to try a few short runs to each
terminal and check the Last pass speeds against the Learned speeds for each switch (Diagnos-
tics > Terminal Switches Status tab). If necessary, you can then adjust the Overspeed 1 margin
to accommodate (possibly) higher short run switch speeds. (Overspeed level 1 faults cause an
emergency slowdown into the terminal landing but the fault is automatically cleared so it is pos-
sible to miss the fact that this is occurring.)
Overspeed level 2 - During passenger (NORM) operation, if car speed exceeds the Overspeed
Level 2 threshold at the time a Normal Terminal switch is activated, an Up (or Down) Normal
Terminal Switch (1-5) Level 2 Speed Fault is detected and an emergency stop is initiated (motor
and brake contactors immediately dropped). The Overspeed Level 2 threshold is calculated as
105% of the Overspeed Level 1 threshold.
Position - During passenger (NORM) operation, if car position varies from the learned posi-
tion by more than the Position Margin at the time a Normal Terminal or Emergency Terminal
switch is activated, an Up (or Down) Normal Terminal Switch (1-5) Position Fault or an Up (or
Down) Emergency Terminal Switch Position Fault is detected and an immediate slowdown is
initiated using the Emergency slowdown profile parameters. The Position Margin for each Nor-
mal Terminal or Emergency Terminal switch is displayed and may be adjusted on the Configu-
ration > Terminal Switches tab. The default value is 2.0 feet.
Emergency Terminal (switches) Overspeed is hard-coded at 95% of Contract Speed. Be certain that
the car is traveling well below this speed when an Emergency Terminal switch is opened to avoid an
emergency stop. In some instances, it may be necessary to re-position an Emergency Terminal switch
to achieve this. This value is NOT affected by the Overspeed 1 margin setting.
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