Operating instructions
64
1 Variable-frequency
drive
Connection status of the control interface board of
the power module
2 Communication
module
Connection status of the communication gateway
module
3 NET A Status of the serial communication
4 NET B ?
5 Address #1 = 0
6 Communication speed = PGM
7 Address #2 = 1
O The gateway has no supply
or has a poor connection
- Check the connection of the
gateway to the power module.
- Energize the power module.
Red ashing The gateway and the power
module are no longer
recognised.
- Check the connection of the
gateway to the power module.
- Re-initialise the supply to the
power module.
Red continuous The power module has
refused a communication
from the gateway
IMPORTANT: Re-initialise the
power supply after having
carried out the action below:
Check that all control interface
board cables of the power module
are correctly connected.
Orange There is a communication
protocol incompatibility
between the gateway and
the power module.
- Check the bus cables.
- Check that the connectors are
well connected to the gateway.
Green ashing The communication is
being established or
communication has
stopped.
Operation is normal
Green
continuous
The gateway is correctly
connected and communi-
cates with the power module.
As above
O The gateway has no supply
or has a poor connection.
- Check the connection of the
gateway to the power module.
- Energize the power module.
Red ashing Resettable fault. Re-initialise the supply to the
power module. If there is no
improvement it may be necessary
to reload the rmware.
Red continuous The module has stopped the
material test.
- Re-initialise the supply to the
power module.
- Replace the gateway.
Green ashing The gateway is operational.
No communication in
progress.
Operation is normal.
Green
continuous
The gateway is operational
and currently communicating.
As above.
The variable-frequency drive will not start the motor, if the
phases connected upstream are reversed. The ICVC screen
reports an alarm; two of the three incoming phases must
be reversed.
The variable-frequency drive does not detect phase reversals
between variable-frequency drive and motor. The verifica-
tion procedure described for the standard machine must
be used.
At the start-up of the compressor, the variable-frequency
drive applies a frequency ramp, until the set point defined
by the parameter “VFD Start-up speed” is reached (default
100% of the value defined by “Compressor 100% Speed”).
The speed is reduced and the guide vanes open. The speed
and the guide vane opening are controlled by the procedure
described in chapter 9.4 of this document.
If compressor shutdown is requested, the variable-frequency
drive applies a decreasing voltage/frequency ramp until
the motor shuts down. The guide vanes are closed, and
then the oil pump shuts down. When the compressor shuts
down, the oil pump ensures post-lubrication.
Reminder: Do not stop the machine manually using the
main disconnect switch or by any means that are likely to
also disconnect the PIC control circuit and the power supply
to the oil pump.
Only emergency stops initiated by the machine control
must be used for this type of shutdown.
13.2.1 - Guide vane opening control
The opening of the guide vanes can be manually controlled
as for the machine without variable-frequency drive, as
described in the 19XR/19XRV controls manual.
13.2.2 - Compressor speed control
In the same way it is possible to manually control the motor
speed: the parameter “Target VFD Speed” can be modified
within the limits of the values defined by “VFD Minimum
Speed” and “VFD Maximum Speed” on the COMPRESS
screen of the ICVC. In this case the machine capacity is
controlled by the guide vanes.
The communication status between the ICVC and the
variable-frequency drive can be quickly checked with the
four status LEDs on the gateway. The potentiometer
controls must not be modified.