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9.0 OPERATING INSTRUCTIONS
9.15 ALARMS
When an Alarm occurs, a large exclamation mark in a triangle will
flash on the display screen. The display message will indicate what
caused the Alarm.
The compressor will stop and cannot be re−started again until the
alarm condition no longer exists and the alarm message reset.
Pressing the STATUS button will display the STATUS screen. The
presence of the ALARM button indicates that an Alarm condition
still exists. Alarm Status is the list of machine operating conditions
that existed at the time of the Alarm.
The name and value of each of the items listed can be seen by
moving the list up and down using the arrow buttons. Pressing the
ALARM button will return the display to the Alarm screen and the
RESET button.
The Alarm needs to be reset by the operator by pressing the RESET
button twice. Any exceptions to this are explained in the alarm
descriptions.
100 PSI
STOPPED BY
ALARM
−ALARM STATUS−
PACKAGE DISCH
PRESSURE
100 psi
PACKAGE DISCHARGE
TEMP
103° F
ALARM MAIN MENU
The possible Alarm messages are as follows;
EMERGENCY STOP− This will occur if the Emergency Stop button is
engaged. The button must be disengaged before the alarm can be
cleared.
BLOWER FAULT− This will occur if a blower fault is sensed.
HIGH AIREND DISCH TEMP− This will occur if the airend discharge
temperature is greater than 109° C (228° F).
REMOTE START FAILURE− This will occur if the Remote Start
button is pressed after the machine is running or if the Remote Start
button remains closed.
REMOTE STOP FAILURE− This will occur if the Remote Stop button
remains open and either Start button is pressed.
SENSOR FAILURE − This will occur if a sensor is recognized as
missing or broken.
VSD FAULT − The VSD fault is read from the drive. The Intellisys will
read the status menu of the variable speed drive. If a fault condition
is returned in the status information, the Intellisys will issue a VSD
FAULT alarm and display the number of the fault condition.
CONTROL POWER LOSS − This will occur if the control circuit is
broken by a bad connection or safety switch (e.g. HAT Switch/ Phase
Monitor). Any fall of voltage below 100VAC for more than 2 seconds
will cause this alarm trip.
STOP FAILURE − This will occur if the compressor should be
stopped but the motor is still running above minimum speed 4
seconds after the stop signal is given.
HIGH START PRESSURE − If the sump pressure is above 100 psi
(6.9 bar) when the compressor starts, the Intellisys will open the
blowdown valve during the first few seconds of starting (3 to 7
seconds). If the sump pressure does not fall to 100 psi (6.9 bar)
during that time period, this shutdown will occur.
CHECK MOTOR ROTATION − This will occur if the Intellisys reads a
negative speed from the VSD when starting .
VSD COMMUNICATION FAILURE − This will occur if the Intellisys
does not receive a response from the VSD when requesting
information. This alarm will take about 8 seconds to occur.
VSD INITIALIZATION FAULT − Will occur if the Intellisys is unable to
establish communications with the VSD after a power up.
LOW SUMP PRESSURE − Will occur if the compressor is operating
at or above the minimum speed and the sump pressure drops
below 15psi (1.03 bar) for 15 seconds.
REPLACE COOLANT FILTER − This will occur if the coolant filter is
blocked and requires changing.
INCORRECT VSD TYPE − Will occur at power up if the VSD type
does not match the size of the compressor
125HP (90kW) machines and above also have the following alarm
messages;
CONTROL POWER LOSS − This will occur if the compressor should
be running and the AC input voltage, as read from the VSD, falls
below 100 VAC. There is a delay of 2 seconds on this alarm in case
the power quickly returns. An open HAT switch or phase monitor are
two things that can cause this alarm.
STOP FAILURE − This will occur if the compressor should be
stopped, but the motor speed has not dropped below the minimum
motor speed setpoint. The Intellisys will wait 4 seconds for the
compressor to stop before issuing this alarm.
HIGH INTERSTAGE PRESSURE − If the interstage pressure is over
100psi while the unit is running and the unit is a 2−stage.