Temperature Sensing Using Temperature-Dependent Resistors - Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual

Functions
7.9 Application-specific functions
7.9.9

Temperature sensing using temperature-dependent resistors

Analog input AI 2
Analog input AI 2 can be used as a current input or resistance input for a temperature
sensor. Both the DIP switch and parameter p0756.2 must be set accordingly for this
purpose.
● P0756.2 = 2 or 3 -> options for setting as current input
● P0756.2 = 6, 7 or 8 -> options for setting as temperature sensor
Analog input AI 3
Analog input AI 3 is designed as a resistance input for a temperature sensor.
Setting options:
● P0756.3 = 6, 7 or 8 -> options for setting as temperature sensor
Permissible temperature sensors
The temperature-dependent PT1000 or NI1000 resistors can be used as sensors. The
values of these sensors are supplied via analog input AI 2 or AI 3 (p2264 = 756.2 or 756.3)
as actual values for the technology controller.
The connection is established at AI 2 (terminals 50, 51) or AI 3 (terminals 52, 53).
Measuring ranges and alarm thresholds for NI1000
The measuring range of the NI1000 sensors extends from – 88 °C ... 165 °C. For values
outside this range, the inverter outputs alarm A03520 "Temperature sensor fault". The fault
type is displayed in r2124.
Measuring ranges and alarm thresholds for PT1000
The measuring range of the PT1000 sensors extends from – 88 °C ... 240 °C. For values
outside this range, the inverter outputs alarm A03520 "Temperature sensor fault". The fault
type is displayed in r2124.
Fault values for temperature sensing via AI 2
● r2124 = 33: Wire break or sensor not connected
● r2124 = 34: Short-circuit
Fault values for temperature sensing via AI 3
● r2124 = 49: Wire break or sensor not connected
● r2124 = 50: Short-circuit
250
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD