Änderungen vorbehalten!
Subject to change without notice!
Blatt/
sheet
PM.7.002883.EN.26
Datum/
date
23.01.2013
Stand/
version
D-02.03.2015
Geprüft/
approved
WAT/MZE
Overspeed governor EOS
Operating instructions
4.2
Functions
4.2.1
Reset
To enable movement of the governor wheel and
operation of the elevator, the solenoids must be
switched on and the safety circuit must be closed
(operational state).
But if either the solenoids are switched off or the
safety circuit contact is opened by the EOS, you
must apply a RESET signal for a short time by using
the reset input to start reset operation.
The reset-function can only activated when
the elevator is not moving. Check the gover-
nor after each reset opera-tion! The syn-
chronisation plate has to be horizontal and
therefore the safety circuit is closed!
A reset is also possible directly on the electronic
board of the EOS. When S1/2 and S1/3 are switched
off simultaneously, a reset operation will be execut-
ed. See chapter 4.3.8 for further informations.
4.2.2
Trip
Safety of mechanical tripping is achieved by using
two tripping solenoids which hold the activation
springs compressed. Each of them is able to trip the
EOS. In any emergency situation both springs are
activated by deactivation of the solenoids.
4.2.3
Unintended car movement UCM (option-
al)
This UCM function is designed to prevent unintend-
ed car movements with open doors. When the UCM
function is activated, the actual position is stored
and supervised. Additionally the speed limits are
reduced to lower values.
The UCM function is activated by removing the
ENM1 and ENM2 signals (which have to be generat
ed externally and have to be applied on the ENM1
and ENM2 inputs).
The MOVEMENT LIMITED output is active as long as
the UCM function is active (see also 4.3.5).
Take care that ENM1 and ENM2 must be active for
emergency rescue operation in order to allow car
movement without triggering UCM function!
4.2.4
Acceleration detection (optional)
With the EOS also the acceleration can be detected.
The excessive acceleration in free fall condition is
realized and the safety gear activated. The governor
does not wait until tripping speed is exceeded for
emergency braking.
When doing standard tests do take care of
the acceleration in order to test the tripping
speed and avoid acceleration-tripping!
4.2.5
Synchronization plate switch
Due to code requirements, the safety circuit contact
must only be closed when governor is in operational
state and is able to rotate freely. Therefore the posi-
tion of the synchronization plate is monitored. If it
is twisted due to sabotage or mechanical failure the
safety circuit is opened.
Keep this in mind, especially for start up and emer-
gency rescue (see chapter 4.4).
