Motorola DIMETRA MTS 2, Installation, Configuration And Basic Service Manual

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MTS 2 and MTS 4 Installation, Con
fi
guration and Basic Service Manual PSU Fan Control
PSU Fan Control
There are three fan supply outputs with LED indicators. Three fan connector outputs supply three fan kits
with two fans connected in parallel in each fan tray. The speci
fi
cations for a FAN output are:
•
Output Voltage: from 12 to 24 VDC ± 5 %
•
Output Current: 1 A for each fan connector output
The Fan supply output voltage is linear dependent on the total power delivered by the PSU and the
ambient temperature. The fan supply starts with 24 V output for a few seconds.
For PSU LED indications refer to "PSU Indicators (LEDs)" on page 11-6
There are several MMI commands which let us to control fans:
•
psu # get fan_voltage
•
psu # set fan_speed
•
psu # get fan_speed
•
psu # set fan_con
fi
g
•
psu # get fan_con
fi
g
•
psu # start_fan
The commands above are described in the
MTS Man Machine Interface Commands manual
.
Alarms and Controls Available Through PSU CAN Bus Interface
The alarms available through the CAN Bus for fans are:
•
Fan 1 alarm: Fan 1 not operating, PSU has received a High signal (open collector)
from fan tray 1 through fan connector 1.
•
Fan 2 alarm: Fan 2 not operating, PSU has received a high signal (open collector)
from fan tray 2 through fan connector 2.
•
Fan 3 alarm: Fan 3 not operating, PSU has received a high signal (open collector)
from fan tray 3 through fan connector 3.
The controls available through the CAN Bus for fans are:
•
No Fan 1: Prevents Fan 1 alarm (and associated LED) when no fan 1 is con
fi
gured.
•
No Fan 2: Prevents Fan 2 alarm (and associated LED) when no fan 2 is con
fi
gured.
•
No Fan 3: Prevents Fan 3 alarm (and associated LED) when no fan 3 is con
fi
gured.
6802800U74-N September 2009
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