Load Sharing & Regeneration; Specific Power Card Connections - Danfoss VLT FC 100 Service Manual

Internal Adjustable Frequen...
When the IGBT temperature reaches the fan turn on
temperature, the fan starts and runs at its minimum speed.
As the IGBT temperature increases, the fan speed increases.
When the IGBT temperature reaches the fan maximum
speed temperature, the fan is running at 100% speed. As
the IGBT temperature decreases, the fan speed decreases.
The fan stops running when the IGBT temperature falls
below the fan turn off temperature.
•
Fan turn on temperature = 104°F [40°C]
•
Fan minimum speed temperature = 104°F [40°C]
•
Fan maximum speed temperature = 176°F [80°C]
•
Fan turn off temperature = 104°F [40°C]
When the control card temperature reaches the fan turn
on temperature, the fan starts and runs at its minimum
speed. As the control card temperature increases, the fan
speed increases. When the control card temperature
reaches the fan maximum speed temperature, the fan is
running at 100% speed. As the control card temperature
decreases, the fan speed decreases. The fan stops running
when the control card temperature falls below the fan turn
off temperature.
•
Fan turn on temperature = 104°F [40°C]
•
Fan minimum speed temperature = 104°F [40°C]
•
Fan maximum speed temperature = 158°F [70°C]
•
Fan turn off temperature = 95°F [35°C]
14-52 Fan Control commands the fans to run at a fixed
speed. If the fans are commanded to run at 100% speed,
which overrides any other speed command.
3.3.7 Load Sharing & Regeneration
Units with the built-in load sharing option contain
terminals 89 (+) DC and 88 (-) DC. Within the adjustable
frequency drive, these terminals connect to the DC bus on
the input side of the DC link reactor.
The use of the load sharing terminals has two configu-
rations.
MG94A222
Service Manual
In one configuration, the terminals are used to tie the DC
bus circuits of multiple adjustable frequency drives
together, allowing one adjustable frequency drive in a
regenerative mode to share its excess bus voltage with
another adjustable frequency drive in motoring mode.
Doing so reduces the need for external dynamic brake
resistors while also saving energy. Any number of
adjustable frequency drives can be connected in this way
as long as they are of the same voltage rating. In addition,
it may be necessary to install DC reactors and DC fuses
and line power AC reactors on line power. Attempting
such a configuration requires detailed considerations. Do
not attempt without first consulting Danfoss Application
Engineering.
In the second configuration, the adjustable frequency drive
is powered exclusively from a DC source. An external DC
source is required. Do not attempt without first consulting
Danfoss Application Engineering
Units with a built-in regeneration option contain terminals
82 (+)DC and 83 (-)DC. Within the adjustable frequency
drive, the regeneration terminals connect to the DC bus on
the output side of the DC link reactor.
Use regeneration terminals to connect one adjustable
frequency drive to one external regeneration module. Do
not use the regeneration terminals to connect the DC bus
circuits of multiple adjustable frequency drives together.

3.3.8 Specific Power Card Connections

Connector MK106, terminals 104, 105 and 106 on the
power card, provide for the connection 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 is
connected between terminals 104 and 106 or a normally
open switch between terminals 104 and 105. If the input
change states, the frequency converter trips on an Alarm
27, Brake Chopper Fault. If no such input is used, or the
normally open configuration is selected, a jumper must be
installed between terminals 104 and 106.
MK500, terminals 1, 2, and 3, and 4, 5, and 6, provide
access to two auxiliary relays. This is a form C set of
contacts, meaning one normally open and one normally
closed contact on a single throw. The contacts are rated
for a maximum of 240 V AC, 2 A and a minimum of 24 V
DC, 10 mA, or 24 V AC, 100 mA. The relays can be
programmed via 5-40 Function Relay to indicate frequency
converter status.
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
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