4.6 Floating relay contacts
Floating relay contacts are provided for the transfer of signals and messages.
Information on location, loading capacity and type of message or signal is found in the electrical
diagram.
If the floating relay contacts are connected to an external voltage source, voltage may be
present even when the machine is isolated from the power supply.
4.7 Options
The options available for your machine are described below.
4.7.1 Option H1
Machine mountings
These mountings allow the machine to be anchored firmly to the floor.
Fig. 10 Machine mountings
4.7.2 Option W1
Prepared for external heat recovery
The cooling oil circuit includes 2 valves regulating the cooling oil temperature:
■ Thermostatic valve, machine
■ Thermostatic valve, heat recovery system
The thermostatic valves ensure that the cooling oil is kept at the ideal temperature for machine op‐
eration.
The thermostatic valve of the heat recovery system opens first so that surplus heat is released into
the heat recovery system. If the heat recovery system cannot carry away enough heat, the thermo‐
static valve of the machine opens to allow hot oil through the oil cooler circuit.
Condition:
Combination valve opening temperature = thermostatic valve opening temperature
The heat available for recovery depends on the individual operating conditions of the machine.
Connections are provided for an external system to recover surplus heat.
The thermostatic valve of the heat recovery system does not function when the machine is deliv‐
ered. The necessary working element must be installed when installing the heat recovery system.
If necessary, the operating element in the machine's thermostatic valve can be exchanged for one
with a higher opening temperature. The opening temperature depends on operating and ambient
conditions.
Working elements are marked with their opening temperature [°C].
4
Design and Function
4.6
Floating relay contacts
30
Operator Manual Screw Compressor
SM Tri-Voltage, SIGMA CONTROL 2
9_5875 33 USE
