Automatic Shut-Down; Unplanned Shut Down And Alarms - Edwards iXL120N Instruction Manual

4.4

Automatic shut-down

If you select 'Run 'til crash', the pump(s) can be damaged and you may invalidate any warranties on the iXL120
system equipment.
Normally, if an alarm condition exists, the iXL120 control system will shut down the iXL120 system. If required you
can request 'run 'til crash' operation. In this mode of operation, most alarm conditions will be ignored and the
pump(s) will continue to operate. For safety reasons the following alarms will shut down the iXL120 system even if
you have selected 'run 'til crash':
POWERLOSS.

EMS (emergency stop command).

DP ACTUAL SPEED (rotational speed below 7 Hz for 3 minutes).

DP THERMISTOR HIGH (risk of damage to pump due to high temperatures).

DP STATUS.

OVERI (motor over current).

DESAT (drive internal fault).

Note: 'Run 'til crash' is automatically reset to 'off' when the electrical supply is removed.
4.5

Unplanned shut down and alarms

The iXL120 system is fitted with a number of pump protection sensors (refer to
warnings and alarms. The tool can determine whether or not to shut down the pump in response to warnings and
alarms.
If the iXL120 system has an unplanned shut down or alarm, ensure that the cause of the shut down or alarm is
identified and rectified before restarting. If you have a PDT connected to the pump then you should note and record
any warning or alarm codes that are displayed (see
down or alarm. If you are in any doubt, please call an Edwards Service Engineer.
Sensor
Dry pump rotational speed
Dry pump body temperature sensor
Motor-controller thermistor
© Edwards Limited 2010. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
CAUTION
Appendix A2) to assist with identifying the root cause of the shut
Table 15 - Pump protection sensors
Shut-down condition
If the pump rotates at less than 7 Hz for more than 3 minutes, then
power to the motor will be interrupted to prevent the motor rotor
from demagnetising.
A warning will be generated if the sensor temperature exceeds
104°C. The pump will slow down if the sensor temperature exceeds
109°C. Power is shut-off to the motor if the sensor temperature
exceeds 112°C (warning 110°C). This is to prevent the motor from
demagnetising.
During steady-state/continuous running, the power delivered to the
motor is reduced linearly if the motor controller temperature
approaches 67°C. This will result in a reduction of motor speed.
During short term overload conditions, power is shut-off to the
motor if the motor controller temperature exceeds 110°C. This will
only occur in an extreme fault condition.
A541-11-880 Issue A
Table 15) that can, if necessary, give
Page 27