Ptc Inputs For Motor Ptc Thermistor; Checking The Ptc Thermistor Shutdown Function - Siemens SINAMICS G180 Installation And Operating Instructions Manual

● Only replace a peripheral board 2 / 4 with safety-oriented inputs with original parts. Only
● Use the "Safe halt" function of the inverter for asynchronous and synchronous motors. If
10.2.4

PTC inputs for motor PTC thermistor

The peripheral boards 2 / 4 provide two PTC thermistor inputs at the control cable terminals
‑X3:90‑93 for the motor temperature monitoring. When using the inputs, remove the 100 Ω
resistor connected there.
The peripheral board 3 has control cable terminals for the PTC inputs. However, there is no
evaluation board. No monitoring is made if you connect PTC thermistors.
Test the PTC thermistors as described below. Consult the factory if the shutdown does not
function.
Inverters without a peripheral board provide PTC thermistor inputs at control cable terminals
‑X2:27‑28. If the peripheral board 2 or 4 is fitted, connect the PTC thermistors of the motor to
control cable terminal ‑X3. This has the following advantages:
● Sensor short-circuit monitoring
● Protective separation of the PTC thermistor inputs from all other inputs up to a rated voltage
● Input ‑X3:90‑91 is ATEX-certified according to PTB 07 ATEX 3057 for motors located in
● Redundant shutdown route, realized using hardware.
See also
Input "Safe halt" / PTC thermistor inputs on peripheral board (Page 124)
10.2.4.1

Checking the PTC thermistor shutdown function

Procedure
Test the shutdown function before commissioning the board. Proceed as follows:
1. Replace the 100 Ω resistor at control cable terminals ‑X3:90‑91 with a potentiometer with
2. Ensure that 24 V is applied at control cable terminal ‑X2:8. When required, jumper ‑X2:8
Installation and operating instructions Sinamics G180
Operating Instructions, 05/2013, 4BS0751-001
replace parts in consultation with the factory.
two errors also occur in the power section, this can result in residual rotation for
synchronous motors. The residual rotation angle can be maximum 180°. Calculate the
residual rotation angle from 360° / number of poles n. Take account of the residual rotation
for your design. This does not apply for asynchronous motors.
of 690 V. The control cable terminals ‑X2:27/28 provides protective separation from the
electronics, but no separation from the other inputs.
hazardous zones.
at least 10 kΩ. Set a value of approx. 100 Ω.
and ‑X2:3.
Spare parts and accessories
10.2 Peripheral boards 1 to 4
141