3.3.8 Specific Card Connections
Connector FK102, terminals 104, 105 and 106 located on the power card, provide for the con-
nection of an external temperature switch. The input could be used to monitor the temperature
of an external brake resistor. Two input configurations are possible. A normally closed switch may
be connected between terminals 104 and 106 or a normally open switch between terminals 104
and 105. Should the input change states, the adjustable frequency drive would trip on an Alarm
29, Overtemperature. The input SCRs would also be disabled to prevent further energy from being
supplied to the DC bus. If no such input is used, or the normally open configuration is selected,
a jumper must be installed between terminals 104 and 106.
Connector FK103, terminals 100, 101, 102, and 103 located on the power card, provide for the
connection of line voltage to allow powering the AC cooling fans from an external source. This is
required when the adjustable frequency drive is used in a load sharing application where no AC
power is provided to the main input terminals. To make use of this provision, the jumpers would
be removed from terminals 100 and 102, 101 and 103. The auxiliary AC line voltage power supply
would be connected to terminals 100 and 101.
The power card MK112, terminals 1, 2, and 3, and 4, 5, and 6 provide access to 2 auxiliary relays.
These are form C sets of contacts, meaning one normally open and one normally closed contact
on a single throw. The contacts are rated for a maximum of 240 VAC, 2 Amps and a minimum of
24 VDC, 10 mA or 24 VAC, 100 mA. The relay can be programmed via par. 5-40
Function Relay
to indicate adjustable frequency drive status.
Terminal positions on the power card labeled MK400 and MK103 are reserved for future use.
3 Internal Adjustable Frequency Drive Opera-
tion
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
3-14
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
3
Summary of Contents for VLT HVAC FC 100
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