Differential Pressure Measurement; Measuring The Coolant Conductivity And Coolant Temperature - Siemens SINAMICS GL150 Reference Manual

Result
The test is passed if the differential pressure is ≤ 0.4 bar and no leaks have occurred in the
cooling system.
3.3.2

Differential pressure measurement

Fundamentals
Differential pressure Δp expresses the pressure drop of the coolant between supply pressure
p and return pressure p
V
flow.
Test procedure
1. The calculated flow is checked. It is permissible that the flow deviates by ±5 % from the
2. The differential pressure is read from the appropriate parameter on the test station
Calculations
The reference differential pressure is calculated from the measured values of the cooling unit:
Δp = p
Result
The test is passed if the differential pressure Δp ≤ 4.0 bar.
3.3.3

Measuring the coolant conductivity and coolant temperature

Fundamentals
Tests are performed in accordance with IEC 60146-1-1.
Sensors in the drive coolant circuit acquire the coolant temperature in the supply line and the
coolant conductivity. The measured values from these sensors are compared with the
measured values of the calibrated cooling unit.
The coolant flow is set at the cooling unit to the calculated flow.
Test procedure
1. The cooling unit is switched on. The auxiliary voltage is present.
2. The calculated flow is checked. It is permissible that the flow deviates by ±5 % from the
SINAMICS GL150 6SL3855 F03 F70 F76 F79 F98 E11
Reference Manual Rev.201902141423 GL150 wassergekühlt
of the drive. The coolant flow is set at the cooling unit to the calculated
R
calculated value.
computer.
- p
V R
calculated value.
Tests
3.3 Cooling system test
31