Rectifier RT9- 24V - MCSU-4 Alarms

Installation, Operation and Technical Manual Rectifier Technologies
158-1872-01 49 19-Feb-14
In this case, the message indicates that there are three alarms present and they can be
observed by pressing the ENTER button.
When the ENTER button is pressed the most recent alarm name, such as the one shown
below will appear on the display.
Alarm 1
Amb Temp High
If no button is pressed again for one minute, the display will revert to the “home” screen
and the sequence begins again.
To view the remaining alarms, use INC and DEC buttons. Pressing the ENTER button will
return the display to the “home” screen. The time and date of any given alarm can be
obtained by entering the ALARM LOG menu.
6.3 MCSU-4 Alarms
A list of all the possible alarms that can be enunciated is shown in the following table.
Alarm Name
Comments
LED
SMR Alarm
Combination of one or more SMR alarms
A
SMR Urgent
One or more SMRs have shut down
A+R
SMR HVSD
SMR shut down due to output over-voltage
A+R
UNIT OFF
SMR is off
A+R
No Response
A particular SMR is not responding to the MCSU-4
A
Power Limit
SMR is in Power Limit
A
No Load
SMR output current less than minimum for SMR type used
A
Current Limit
SMR in current limit
A
Voltage High
Voltage measured by SMR too high
A
Voltage Low
Voltage measured by SMR too low
A
UNCAL SMR
SMR Internal Adjustment for current sharing out of limits
A
EEPROM Fail
EEPROM failed (MCSU-4 or SMR)
A
Fan Fail
SMR Internal Fan failure alarm (only possible on SMRs with fans)
A
Relay Fail
SMR output relay contact failure
A
No Demand
Control loop in SMR not in normal state
A
H/S Temp High
SMR heatsink temperature too high (where available)
A
DC-Dc Contr Fail
SMR DC/DC converter fault
A+R
Temp Sensor Fail
Temp sensor in SMR faulty - S/C or O/C (where available)
A+R
Vref Fail
Voltage reference in SMR microprocessor circuit faulty
A+R
HVDC not OK
DC/DC converter (boost) voltage in SMR not OK
A+R
AC Volt Fault – detected
by SMRs
All SMRs are reporting AC fault. Available only on some SMR models.
A+R
AC Volt Fault – detected
by CSU
None of SMRS are responding (AC fail assumed), or if AC monitor is
used, AC voltage is out of limits set
(When no AC monitoring module is used, this comes together with “SMR Comms Fault”)
A