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For machines with a pipe connection, the potential pressure drop inside the machine is given
in the following table:
Table 4-2
Type
1PH818.
1PH822.
1PH828.
4.5
Interlock circuit for the external fan
Interlock circuit for the external fan motor
For machines with external fans, install an interlock circuit that prevents the main machine
being switched on if the external fan is not operational.
Force-ventilated 1PH818. and 1PH822. motors are equipped with electronically commutated
motors (EC motor).
NOTICE
Voltage fluctuations
The electronics of the external fan equipped with EC motor can be damaged as a result of
voltage fluctuations. Supply the external fan with power from the line supply and not via a
frequency converter.
4.6
Interlock circuit for anti-condensation heating (option)
If the anti-condensation heating is operated while the machine is running, this can increase
the temperatures inside the machine.
● Install an interlock circuit that switches off the anti-condensation heating once the main
● Only switch on the anti-condensation heating after the machine has been switched off.
See also
Switching on the machine (Page 97)
SIMOTICS M-1PH8 1PH818., 1PH822., 1PH828.
Operating Instructions 10/2017
Pressure drop in motors with pipe connection
Degree of pro‐
tection
IP23
IP55
IP23
IP55
IP23
IP55
machine is switched on.
4.5 Interlock circuit for the external fan
Volume flow
Pressure drop
0.21 m
/s
450 Pa
3
0.17 m
/s
550 Pa
3
0.33 m
/s
600 Pa
3
0.31 m
/s
650 Pa
3
0.52 m
/s
600 Pa
3
0.42 m
/s
600 Pa
3
Preparations for use
Flow resistance
10204 Ns
/m
2
8
19030 Ns
/m
2
8
5510 Ns
/m
2
8
6760 Ns
/m
2
8
2220 Ns
/m
2
8
3400 Ns
/m
2
8
33
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