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18 Commander S100 User Guide
3.3.1.3 Enclosure design and drive ambient temperature
Drive derating is required for operation in high ambient temperatures.
Totally enclosing the drive in either a sealed cabinet (no airflow) or in a well-ventilated cabinet makes a significant difference on drive cooling.
The chosen method affects the ambient temperature value (T
rate
) which should be used for any necessary derating to ensure sufficient cooling for the
whole of the drive.
The ambient temperature for the four different combinations is defined below:
1. Totally enclosed with no air flow (<2 m/s) over the drive T
rate
= T
int
+ 5 °C
2. Totally enclosed with air flow (>2 m/s) over the drive T
rate
= T
int
Where:
T
int
= Temperature inside the cabinet
T
rate
= Temperature used to select current rating from tables in section 10 Technical data.
3.4 Drive fan operation
S100-01x13 and S100-01x23 drive are cooled by natural convection. All other drives are ventilated by an internally controlled fan that will turn on
when required to keep the drive cool.
Ensure the minimum clearances around the drive are maintained to allow air to flow freely.
3.5 Routine maintenance
Regular checks of the following should be carried out to ensure the drive reliability is maximized:
Table 3-5 Routine maintenance
Environment
Ambient temperature Ensure the enclosure temperature remains at or below maximum specified.
Dust
Ensure the drive remains dust free. The lifetime of the fan is reduced in dusty environments. If the fibre filter accessory is
used, ensure it remains clear and free of dust.
Moisture
Ensure the drive enclosure shows no signs of condensation. If moisture is discovered, an anti-condensation heater may
be required which must be switched off when the drive is running to prevent excess heating.
Enclosure
Enclosure particle filters Ensure filters are not blocked and that air is free to flow in and out of the enclosure.
Electrical
Screw connections Ensure all screw terminals remain tight
Crimp terminals Ensure all crimp terminals remain tight – check for any discoloration which could indicate overheating
Cables Check all cables for signs of damage
Ground connections Must be inspected and tested at appropriate intervals
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