Control Power Supply; Control Terminals - Danfoss VLT FC 100 Service Manual

Operator Interface and Adju...

2.6.3 Control Power Supply

2 2
Terminals 12 and 13 provide 24 V DC low voltage power,
to the digital input terminals (18–33). Those terminals must
be supplied with power from either terminal 12 or 13, or
from a customer supplied external 24 V DC power source.
Improperly connected control wiring is a common service
issue for a motor not operating or the adjustable
frequency drive not responding to a remote input.

2.7 Control Terminals

Control terminals must be programmed. Each terminal has
specific functions it performs and a numbered parameter
associated with it. See Table 2.6. The setting selected in the
parameter enables the function of the terminal.
It is important to confirm that the control terminal is
programmed for the correct function.
See the Programming Guide for details on changing
parameters and the functions available for each control
terminal.
In addition, the input terminal must be receiving a signal.
Confirm that the control and power sources are wired to
the terminal. Then check the signal.
Signals can be checked in two ways. To select digital input
for display, press the [status] key as discussed previously,
or use a voltmeter to check for voltage at the control
terminal. See chapter 6.4.14 Input Terminal Signal Tests
In summary, for proper adjustable frequency drive
functioning, the adjustable frequency drive input
control terminals must be:
•
wired properly
•
powered
•
programmed correctly for the intended function
•
receiving a signal
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Service Manual
Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG94A222