Service manual
control cable is run between frequency converters, and not
between frequency converters and other devices.
Parameters for configuring the input and output using
NPN and PNP.
These parameters cannot be changed while the motor is
running.
2.3.2 Output Signals
The frequency converter also produces output signals that
are carried either through 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 V DC. In addition, a pulse reference can be provided on
terminals 27 and 29. Output analog signals generally
indicate the 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, 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 V DC 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 V DC 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.
Number of digital outputs
2
Terminal number
42, 45
1)
Voltage level at digital output 17 V
Max. output current at digital output 20 mA
Max. load at digital output 1 kΩ
Table 2.1 Digital Output
1)
Terminals 42 and 45 can also be programmed as analog output.
2.4
Service Functions
Service information for the frequency converter can be
shown in display lines 1 and 2. 24 different items can be
accessed. Included in the data are
•
counters that tabulate operating hours, etc.
•
fault logs that store frequency converter status
values present at the ten most recent events that
stopped the frequency converter
•
frequency converter nameplate data
14-28 Production Settings
and 14-29 Service Code, are the
relevant service parameters.
Parameter settings are displayed by pressing [Main Menu]
on the LCP.
Use the navigation keys [
▲
], [
▼
], [►] and [◄] to scroll
through parameters.
See the FC 101 Quick Guide, MG18A for detailed
information on accessing and displaying parameters, and
for descriptions and procedures for service information
available in parameter group 6-** Analog In/Out.
2.5 Control Terminals
Control terminals must be programmed. Each terminal has
specific functions and a numbered parameter associated
with it, see Table 2.2. 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 [Main Menu].
Use [
▲
], [
▼
], [►] and [◄] to scroll through parameters.
See the HVAC Basic Drive FC 101 Quick Guide, MG18A 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 [Display Mode], or a
voltmeter can be used to check for voltage at the control
terminal.
In summary, for proper frequency converter functioning,
the frequency converter input control terminals must be:
•
Wired properly
•
Powered
•
Programmed correctly for the intended function
Frequency Converter Control
VLT
®
HVAC Basic Drive Service Manual
MG90X202 - VLT
®
is a registered Danfoss trademark 19
2 2