6.2
Electrical installation
L1
L2
L3
1
2
6
4
2
5
3
1
4
2
6
K0
PE
14
13
23
24
1
3
2
4
X600
PE
ZAdyn4C MRL AI
Q1
Device switch connection
1
Mains 3~ 400V/PE/50Hz
2
auxiliary contacts
7
Start-up
7.1
Testing the "Safe Torque Off (STO)" safety function
In the course of start-up and maintenance, the "Safe Torque Off (STO)" function must be tested as a
safety function test.
Danger!
To prevent unintentional movement of the lift car, the fuse for the brakes supply must be removed for
tests which are conducted with the drive at a standstill. In the MRL devices, the contactors for the
brakes are activated by the STO coupling relay supply; the brakes could open unintentionally.
The procedure for testing the "Safe Torque Off (STO)" function is described in the chapter "Testing the
"Safe Torque Off (STO)" function" of the ZAdyn4C operating instructions.
In the ZAdyn4C MRL the relay contacts of the coupling relay for STO activation are not accessible
because the control unit is usually installed in the lift shaft. The coupling relays used for activation are
activated separately. The described tests must be performed by suitable activation of the relays.
Original operating instructions
ZAdyn4C MRL
Start-up
R-TBA14_01-GB 1845
Part.-No. 00163419-GB
36/44
