Festo CMMT-ST-C8-1C Series Manual page 17

Assembly
Detailed information about the required mounting clearances and any derating that may be necessary
as a function of the ambient temperature è Fig. 15
The table below shows the mounting clearances for standard output currents and ambient tempera-
tures.
Examples
Continuous, constant
output current in con-
trolled operation [A]
4
5
6
7
8
Tab. 8: Required mounting clearances (examples)
In order for the device to reach its specified service life, the maximum housing interior temperature
must be restricted. The specified derating serves to restrict the housing interior temperature.
The necessary clearances are determined by the temperature in the control cabinet and the required
effective current. The Festo PositioningDrives software can be used to calculate the effective current.
If the clearances are insufficient, the device will be switched off by the I²t or temperature monitoring
function of the power stage. The maximum device current can be parameterised in the plug-in regard-
less of the nominal current of the connected motor è online help for the CMMT-ST plug-in.
In the cases below, the required effective current that will cause the device to heat up is lower than
the nominal current of the device:
– In closed-loop operation
– In open-loop operation, if the device is running in intermittent duty
Festo — CMMT-ST-C8-1C-...-S0 — 2021-04b
Ambient operating temperature
30 °C
Mounting clearances
0 mm
40 °C
0 mm
3 mm
15 mm
50 °C
0 mm
3 mm
10 mm
impermissible
17