Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
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8. Magnum Alarms and Safeties
There are three types of alarms that are generated by the Magnum control logic:
 Information only alarms,
 Magnum system alarms and
 Chiller Setpoint safety alarms.
All alarms have the same format. The alarm is identified and is date/time stamped. Alarms can be viewed from the
Magnum keypad by selecting the ‘Alarms’ from the main menu, or through MCS-Connect.
8.1. Information Only Alarms
System Generated Alarms 8.1.1.
The following alarms are generated to provide information; they will not cause a change in the control
algorithm such as a lock out condition or a Relay Output being forced off.
 POWER FAILED – Generated when power to the Magnum was lost.
 POWER RETURNED – Generated when power to the Magnum returned.
 HW DATE INVALID – The date contained/read from the hardware real time clock chip is not valid.
Check battery voltage, it should be > 2.0 vdc.
 HW TIME INVALID – The time contained/read from the hardware real time clock chip is not valid.
Check battery voltage, it should be > 2.0 vdc.
 SW DATE INVALID – The date contained/read from the software clock is not valid.
 SW TIME INVALID The time contained/read from the software clock is not valid.
 RAM INTEGRITY – the data contained in the battery-backed up RAM memory may be corrupted.
This does not stop the Magnum from running. It means the historical data may be incorrect (run
times, cycles, min/max values, and trend/graph data).
 WATCHDOG RESET – The Magnum has reset itself because of improper operator of the Magnum
board. Please consult the manufacturer if this alarm has occurred.
 LOST A/D CONVTR – The Magnum microprocessor has lost communications to the Analog to Digital
converter chip (chip that converts sensor voltages to a digital number). Check for a shorted sensor
that may cause
 LOST DISPLAY – Generated when communication to the Keypad/Display is lost.
 CF INIT ERROR – The Compact Flash card that was installed cannot be initialized and therefore
cannot be used. Replace the Compact Flash card with one that works.
 BATTERY FAILED – Generated when Magnum is not getting power from the Battery.
User Initiated Alarms 8.1.2.
The following alarms indicate that an individual took action: (Most require proper authorization)
 LOCKOUT RESET – Generated when a user resets a compressor other unit from a locked condition.
 COMPUTER RESET – Generated when the manual reset button on the Magnum is pressed.
 ALARMS CLEARED – Generated when a user clears the alarm history.
 STPT CHANGED – Generated when a user makes a change to a Setpoint; the number of the
Setpoint will also be displayed with the alarm.
 RO TO (Selected Condition) – Generated when a user manually changes the condition of a Relay
Output (either AUTO, MANON, or MANOFF).
 AO TO (Selected Condition) – Generated when a user changes the condition of an Analog Output
(either AUTO or MANUAL. If MANUAL, then a dialog box will appear to input the number value).
 SI TO (Selected Condition) – Generated when a user changes the condition of a Sensor Input (If a
digital input, then either AUTO, MANON, or MANOFF. If an analog input, then either AUTO or
MANUAL. If MANUAL, then a dialog box will appear to input the number value).
 POINT INFO CLEAR – Generated when a user clears all point information (run times, cycles,
min/max values, etc.).
 CLOCK SET – Generated when a user makes a change to the Magnum real time clock.
 CFG DOWNLOADED – Generated when a user uploads a new configuration file into the Magnum.
 ETHERNET CHANGE – Generated when a user makes a change to the Ethernet settings through
the Keypad/Display.