21. MHRC MAGNUM Alarms and Safeties
■ Information only alarms,
■ MHRC MAGNUM system alarms and
■ MHRC MAGNUM setpoint safety alarms.
All of the alarms have the same format. The alarm is identifi ed and it is date time stamped. Alarms
can be viewed from the MCS-MAGNUM by pressing the ALARM STATUS (4) key or from the MCS-
CONNECT program.
The following alarms are generated to provided 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.
21.2.2 Alarms as a result of user actions
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).
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21.2 Information only alarms
21.2.1 System generated alarms
21.1 Introduction
There are three types of alarms that are generated by the MHRC MAGNUM control logic:
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