Design and Functions
- 49 -
Safety function
Norm reference SIL
N
or
m
al
M
od
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Du
rin
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mi
ssi
on
ing
Actuator
Comments
9.
Door monitoring
(monitoring and
replication of the
locked/closed sta-
tus for the car and
landing doors)
EN81-20
§5.3.9.1.1
§5.3.9.4.1
§5.3.11.2
§5.3.13.2
§5.3.9.2
3 X
X
X (X)
2)
Due to the integration of LIMAX
Safe SG/SC in the SC (
the door contacts do not cut the
SC directly. Instead, LIMAX Safe
SG/SC detects the state of the
door circuit and cuts SC by NOC.
10.
Inspection
Additional func-
tion, no refer-
ence to the
norm
-
X
X
LIMAX Safe SG/SC cuts the SC if
inspection switch is set to inspec-
tion (in addition to the cut of SC
by inspection switch) by OC and
NOC. The OC and NOC are
closed again if a direction button
is pressed.
11.
Over-speed
(final tripping)
EN81-20
§5.6.2.2.1.1.a.)
3 X
X
X
X
X Norm reference only valid for
LIMAX Safe SG and only if SGC
acts a suitable electromechanical-
ly driven blocking device of the
safety gear
1)
During commissioning the final limit switches are derived from temporary reference positions instead of the
uppermost/lowermost floor position.
2)
Only when NOC does not open within the desired time
Some of the safety functions have parameters to configure the safety function behavior. These parameters can
be adjusted over the CANopen interface.
10.3.1
Over-speed (pre-tripping / final tripping)
If the actual speed exceeds the pre-tripping speed, OC opens. OC is kept open even after stand still. This state
is stored in a non-volatile way: OC will also open after a power cycle. This state is cleared by manual reset by
RESET-Button.
The pre-tripping speed depends on the rated speed of the Safe Box, refer to Annex A.
If the actual speed exceeds the final-tripping speed, OC, NOC and SGC open. The contacts are kept open
even after stand still. This state is stored in a non-volatile way: The contacts will also be open after power cycle.
This state is cleared by manual reset by RESET-Button.
The final-tripping speed depends on the rated speed of the Safe Box, refer to Annex A.
10.3.2
Check on Retardation
This safety function checks if the permitted speed when approaching the terminal floors is not exceeded.
The safe box calculates the permitted speed by the distance “s” of the actual position to the final limit switch,
dependent on the moving direction:
Distance to upper limit switch when moving up.
Distance to lower limit switch when moving down.
The permitted speed amounts to
𝑣
𝑚𝑎𝑥
= √2 ⋅ 1.7 𝑚 𝑠
2
⁄
⋅ 𝑠
If the permitted speed is exceeded OC opens.
This state is reset automatically 10 s after standstill is reached: OC closes again.
