Plug-in control
54
GA 05.141/6.02 - 07/2003
4.2 Operating statuses
Switch-On Guard
The converter goes into the “Switch On Guard” operating
status after the power is switched on and after initializa-
tion. If there is no warning or failure, it changes over into
the “Ready” condition.
After a failure has been acknowledged, the converter
goes into the “Switch On Guard” operating status. The
failure must be acknowledged a second time, so that it
then goes into the “Ready” condition.
Ready
The converter is ready and waits for the START com-
mand. All parameters can be interrogated or changed via
the operator control panel or the serial interface.
The basic menu parameters (refer to 4.3, Operating
menu) can be scanned via the operator control panel.
Acceleration
The pump continuously accelerates with the maximum
current. The acceleration time is monitored to ensure
that it lies within a programmed value (refer to the menu
“settings pump/Accel. Time”). If the converter hasn’t rea-
ched the normal operating mode during the monitoring
time, then it is shutdown with the failure message “Accel.
Time”.
Normal operation
After a programmable frequency threshold has been rea-
ched (refer to the menu “settings pump/Normal Operati-
on”), the converter goes into the normal operation mode
but the pump continues to accelerate up to the frequen-
cy setpoint.
Overload
The speed is continuously monitored and controlled. If
the speed, even at maximum current, cannot be held at
the setpoint, as a result of external influences, e.g.
excessive gas intake, the speed reduces until the con-
verter goes into the “Overload” operating condition when
the programmable frequency threshold is fallen below
(refer to the menu “settings pump/Normal Operation”).
The acceleration time is restarted. If the converter hasn’t
gone into the normal operating mode after the monito-
ring time, it is shutdown with the failure message “Failure
Overload Time”.
Mains Down
If the power fails while the pump is running the pump
generates the power necessary to operate the
MAG.DRIVE
digital
up to a minimum frequency of 110 Hz.
When the power returns, the pump is again accelerated
up to the frequency setpoint.
The acceleration time is now restarted. If the converter
hasn’t gone into the normal operating mode after the
monitoring time, it is shutdown with the failure message
“Accel. Time”.
Deceleration
After a stop command, the pump is braked down to a
speed < 5 Hz as quickly as possible. A brake resistor is
integrated into the converter which converts the regene-
rative energy into heat.
Failure
The converter was shutdown with a failure message and
waits for a failure acknowledgement after the failure has
been removed. The failure type can be read from the dis-
play. The failure message can be acknowledged by
depressing the STOP key or via the serial interface,
when the pump stands still (f < 5 Hz).
