between frequency converters and other devices. See
Earthing Screened Cables in this section for correct
methods for terminating a screened control cable.
2.5.2 Output signals
The frequency converter also produces output signals that
are carried through either the RS-485 serial bus or terminal
42. Output terminal 42 operates in the same manner as
the inputs. The terminal can be programmed for either a
variable analog signal in mA or a digital signal (0 or 1) in
24 VDC. In addition, a pulse reference can be provided on
terminals 27 and 29. Output analog signals generally
indicate the frequency converter frequency, current, torque
and so on to an external controller or system. Digital
outputs can be control signals used to open or close a
damper, for example, or send a start or stop command to
auxiliary equipment.
Additional terminals are Form C relay outputs on terminals
01, 02, and 03, and terminals 04, 05, and 06.
Terminals 12 and 13 provide 24 VDC low voltage power,
often used to supply 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 VDC power source. Improperly connected
control wiring is a common service issue for a motor not
operating or the frequency converter not responding to a
remote input.
2.6 Control Terminals
Control terminals must be programmed. Each terminal has
specific functions it is capable of performing and a
numbered parameter associated with it. See table
Control
Terminals and Associated Parameters
. 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.
Parameter settings are displayed by pressing the [Status]
key on the LCP.
130BP045.10
Status
Quick
Menu
Main
Menu
Alarm
Log
Use the arrow keys [
▲
], [
▼
], [
►
] and [
◄
] on the LCP to scroll
through parameters.
Auto
on
Reset
Hand
on
Off
Status
Quick
Menu
Main
Menu
Alarm
Log
Back
Canc
el
In
fo
OK
On
Alarm
Warn.
130BA027.10
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. Digital input can be
selected for display by pressing [status] key as discussed
previously, or a voltmeter may be used to check for
voltage at the control terminal. See procedure details at
Input Terminal Test
in Section
Test Procedures
.
In summary, for proper frequency converter functioning,
the frequency converter input control terminals must be:
1.
wired properly
2.
powered
3.
programmed correctly for the intended function
4.
receiving a signal
Operator Interface and Cont...
High Power Service Manual for Modular F Frame Drives
44
MG90K202 - VLT
®
is a registered Danfoss trademark
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