Coolant Inlet Temperature; Motor Temperature Monitoring - Bosch Rexroth MAD Project Planning Manual

MAD / MAF Asynchronous Housing Motors
9.8.6

Coolant inlet temperature

Setting the inlet temperature
9.9

Motor temperature monitoring

Motor with terminal box
Motor, housing
CU, CuZn39Pb2
Tab. 9-12: Materials in the cooling circuit
For the sizing and operation of the cooling system, the machine manufacturer
has to exclude all chemical or electro-chemical interactions with subsequent
corrosion or disintegration of motor parts.
MAD/MAF motors are designed in compliance with DIN EN 60034-1 for oper‐
ation at coolant temperatures of +10 ... +40 °C. This temperature range has
to be complied with. Higher coolant temperatures cause a higher reduction of
the available torque. Due to high temperature gradients, lower coolant tem‐
peratures can result in the destruction of the motor.
Install systems in the cooling circuit for monitoring flow, pressure
and temperature.
The coolant supply temperature has to be adjusted such that the specified
temperature range is kept and the present surrounding air temperature is tak‐
en into account.
The lower limit of the recommended coolant inlet temperature can be limited
in relation to the existing ambient temperature.
The coolant inlet temperature has to be set in a temperature
range of +10 ... +40°C and may only amount to a maximum of
5°C below the existing ambient temperature to avoid .
Example 1:
Ambient temperature: +20 °C
Coolant inlet temperature to be set: +15 ... +40 °C
Example 2:
Ambient temperature: +30 °C
Coolant inlet temperature to be set: +25 ... +40 °C
MAD/MAF motors are fitted with two fixed temperature sensors (PTC) inte‐
grated in the winding for motor protection. The connection wires for these
sensors are routed out with the power connection in the terminal box or in the
flange socket.
To protect the motor from thermal overload, only one sensor has to be con‐
nected and evaluated. If the connected sensor fails, the remaining free sen‐
sor can be connected as possible replacement. For connection of sensors,
observe the information in
Bosch Rexroth cannot assume any warranty or guarantee for the
function of the replacement sensor at the time of use. However,
the function of the replacement sensor can be checked before
use according to the resistance values specified in
The wire pair of the replacement sensor is connected to the terminal strip in
the terminal box (see fig. 8-3).
Screw connections
Chrome-plated brass
chapter 8 .
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Application notes
Quick coupling
Chrome-plated brass
fig. 9-8.