Siemens 611 configurationmanual Data, main motor cooler, LqOPlq

Technical data and characteristics 14.1 Explanations of the formula abbreviations

Data, main motor cooler

QH,MAX

H,MIN

ΔTH

˂7.LQ

Maximum heat loss dissipated via the main cooler when the motor is utilized up to the rated torque MN and at the rated temperature TN.

Recommended minimum volume flow rate in the main cooler to achieve the rated torque MN.

The temperature increase of the coolant between the inlet and return flow circuit of the main cooler at operating point QH,MAX and H,MIN can be estimated using the following formula:

Average water density: ρ = 1000 kg/m3

Average specific thermal capacity of water: cp = 4.18 · 103 J/(kg K)

Temperature deviation from intake temperature: ΔTH in K

Volume flow: in m3/s

&RROLQJPHGLXPWHPSHUDWXUHLQFUHDVHDWUHFRPPHQGHG PLQLPXPYROXPHIORZUDWHDFFRUGLQJWRGDWDVKHHW

9LQOPLQ

Figure 14-2 Sample characteristic "Temperature increase of the coolant between the inlet and return flow circuit of the main cooler"

ΔpH Coolant pressure drop between the inlet and return flow circuit of the main cooler with volume flow H,MIN.

The main and precision coolers for motors with integrated cooling are connected in parallel. The volume flow rates of the main and precision coolers are combined to create the total volume flow rate; the pressure drop in the main cooler ΔpH is the same as that in the precision cooler ΔpP.

1FW6 Built-in torque motors	201
Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7