Operating Instructions

WARNING
Electric shock due to unsuitable motor temperature evaluation system
Voltage flashovers to the electronics of the inverter can occur in motors without safe electrical
separation of the temperature sensors in accordance with IEC 61800‑5‑1 when the motor
develops a fault.
● Install a temperature monitoring relay 3RS1… or 3RS2…
● Evaluate the temperature monitoring relay output using a digital input of the inverter, e.g.
using the "External fault" function.
You can find additional information about the temperature monitoring relay on the Internet:
Manual 3RS1 / 3RS2 temperature monitoring relays (https://
support.industry.siemens.com/cs/ww/en/view/54999309)
Note
Malfunction caused by incorrect switching states as the result of diagnostic flows in the off
state (logical state "0")
In contrast to mechanical switching contacts, e.g. emergency stop switches, diagnostic flows
can also flow with semiconductor switches in the off state. If interconnection with digital inputs
is faulty, the diagnostic flows can lead to incorrect switching states and thus to a malfunction
of the drive.
● Observe the conditions for digital inputs and digital outputs specified in the relevant
manufacturers documentation.
● Check the conditions of the digital inputs and digital outputs in regard to the flows in off
state. If applicable, connect the digital inputs with suitably dimensioned, external resistors
to protect against the reference potential of the digital inputs.
In order to install the inverter in compliance with UL, you may only connect the DO 0 and DO 2
relay outputs of the Control Unit using copper wires approved for 75 °C.
DANGER
Danger to life as a result of a hazardous voltage at the Control Unit
If the insulation is damaged on the lines that are connected to the terminals DO 0 and DO 2,
parts of the Control Unit may still be connected to the power supply. When connecting higher
voltages at terminals DO 0 and DO 2, there is a risk of electric shock when touching the
Control Unit.
● Only connect dangerous voltages using cables with double insulation at relay outputs
DO 0 and DO 2 of the Control Unit.
Installing
4.5 Connecting the interfaces for the inverter control
Converter with the CU230P-2 Control Units
140 Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257946B AF