English (GB)
7
STO installation, optional
Fig. 7 STO wiring
Activating the optional STO function
The STO function is activated by removing the voltage at terminal
37 of the frequency converter. By connecting the frequency
converter to external safety devices providing a safe delay, an
installation for a Safe Stop 1 is obtained. External safety devices
need to fulfil Cat./PL or SIL when connected to terminal 37.
The STO function can be used for the following motor types:
• asynchronous
• synchronous
• permanent magnet motors.
When terminal 37 is activated, the frequency converter issues an
alarm, trips the unit, and coasts the motor to a stop. A manual
restart is required. Use the STO function to stop the frequency
converter in emergency stop situations. In normal operating
mode, the STO terminal 37 must be deactivated to start the
motor.
Connecting the signal terminals
Connect the signal cables according to the guidelines for good
practice to ensure EMC-correct installation.
• Use screened signal cables with a conductor cross-section of
minimum 0.5 mm2and maximum 1.5 mm2.
• Use a 3-conductor screened bus cable in new systems.
Connection of a thermistor (PTC) to CUE
The connection of a thermistor (PTC) in a motor to CUE requires
an external PTC relay.
The requirement is based on the fact that the thermistor in the
motor only has one layer of insulation to the windings. The
terminals in CUE require two layers of insulation since they are
part of a PELV circuit.
A PELV circuit provides protection against electric shock. Special
connection requirements apply to this type of circuit. The
requirements are described in EN 61800-5-1.
In order to maintain PELV, all connections made to the control
terminals must be PELV. For example, the thermistor must have
reinforced or double insulation.
Wiring diagram, MCB 114
See fig. 14 in the appendix.
Servicing the product
Conduct a functional test every 12 months to detect any failure or
malfunction of the STO functionality.
To conduct the functional test, perform the following steps:
• Remove the 24 V DC voltage supply at terminal 37.
• Check if the LCP displays the alarm Safe Stop A68.
• Verify that the frequency converter trips the unit.
• Verify that the motor is coasting and comes to a complete
stop.
• Verify that the motor cannot be started.
• Reconnect the 24 V DC voltage supply to terminal 37.
• Verify that the motor is not started automatically and restarts
only by giving a reset signal (via bus, Digital I/O, or reset
button).
Enclosures
See nameplate and install according to enclosure type.
Enclosure Appendix
Mains Motor
A2 fig. 2fig. 3
A3
A4 fig. 4fig. 5
A5
B1 fig. 6fig. 7
B2
B3 fig. 8
B4 fig. 9
C1 fig. 10
C2
C3 fig. 11
C4 fig. 12
D1h fig. 13
D2h
TM07 4594 1919
Pos. Description
1 Reset button
2 Safety relay (cat. 3, PL d or SIL2)
3 Emergency stop button
4Short-circuit protected cable if the product is not
installed inside an IP54 cabinet.
When using Pt100 with 3-wire
cable, the resistance must not
exceed 30 Ω.
CAUTION
Electric shock
Minor or moderate personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on. See
Installation requirements
- Touching the electrical parts may be fatal, even
after CUE has been switched off.
