Industrial gear units – Operating and Assembly Instructions
60 B 1050 en-1819
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4.7 Oil heater (Option: OH)
NOTICE! Gear unit damage
Failure to observe the following points may cause damage to the gear unit:
• The oil heater must be completely submerged in the oil bath.
• The manufacturer documentation must be observed.
• In the case of lubricant circulation, the operator must ensure that the drive unit is only operated above a
temperature of 0 °C with synthetic oil or 10 °C for mineral oil (4.3 "Lubricant circulation (Option: LC, LCX)").
• With the option VL/KL 4-6 in combination with an oil heater, this must be switched off during operation
The oil heater is equipped with a temperature sensor and a thermostat. The heater is pre-set to a
switch-off temperature of 20 °C. This means that the heater is in operation as long as an oil
temperature of 20 °C has not been reached. Please contact Getriebebau NORD for other switch-off
temperatures.
The oil heater must remain functional when the gear unit is shut down in order to ensure that the oil
temperature does not reduce too much.
If an oil heater is used, it is recommended that the gear unit is also equipped with a PT 100 to monitor the oil
temperature.
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4.8 Temperature monitoring (Option: PT100)
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NOTICE!
Gear unit damage
The gear unit may be damaged by overheating.
• Individual monitoring elements are not interlocked by NORD. The operator is responsible for implementing
this interlock. Unless they are interlocked, each of the devices can trigger an alarm.
• A regular function check of the system is necessary.
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The PT100 is an electrical resistor with which the oil temperature can be monitored. The electrical
resistance depends on the oil temperature. The PT100 must be connected to a suitable evaluation
device and the signal must be evaluated. The gear unit must be shut down if the permissible oil
temperature is exceeded.
The triggering device must be set so that the drive unit is shut down when the maximum permissible
oil temperature is reached.
For mineral oil, the maximum permissible oil temperature is 85 °C.
For synthetic oil, the maximum permissible oil temperature is 105 °C.
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