SUMMARY OF ERROR MESSAGES
C-2 MTS-3000 SERIES OPERATION AND REFERENCE MANUAL
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CU M004 01A
Remv parl’s 1st:
The user tried to perform some action while one or more channels were selected for
paralleling. To avoid this alarm, first remove the paralleling by entering the
following key sequence: MENU | Settings | Parallel | , and then press the
appropriate Fn buttons until there are no channels selected.
Remv ramps 1st:
The user tried to perform some action while one or more quantities were selected to
be ramped. To avoid this alarm, first remove the ramping by entering the following
key sequence: MENU | Settings | Ramps Disabled | .
Too many Digits:
Too many digits were entered (usually after a decimal point) while entering data
from the keypad. Press CE and try again.
Note: In addition to the errors reported above, some frequently-occurring inappropriate button pressings
generate only a long "Beep" without an accompanying message display (e.g. attempting to select a
line that doesn’t contain any selectable or adjustable quantity). Another inappropriate move is
pressing the CE key other than in the middle of making a keypad entry. The displaying of alarm
messages for these cases was deliberately bypassed to reduce the number of nuisance alarms.
C.2 HARDWARE ALARMS
Note: Except for "Output x Error", all the following hardware alarms result in the amplifier outputs
being set to zero and the AC output enable being turned off (i.e. the system returned to
programming mode).
Bad grnd return: This alarm means that some of the output current from one module is incorrectly
returning via a different module. This typically occurs when the return neutral
connection from the load is connected to the neutral terminal of some other module.
The threshold current for this alarm is approximately 0.5A. To avoid this alarm, fix
the external ground returns such that this doesn’t happen.
Critical Overtemp: This alarm is obtained if the measured temperature of one of the amplifiers
significantly exceeds the point at which the amplifier should have shut itself down
from over temperature (and generated a "x:Ovrtmp Shtdwn" alarm). This alarm is
an extra safety precaution and is normally never obtained since the "x:Ovrtmp
Shtdwn" alarm occurs first. Although the "Critical Overtemp" alarm is designed to
disable the AC outputs - if it occurs - there’s most likely some fundamental problem
with one or more amplifiers and the system should be powered down immediately
to prevent further damage.
Missng Zero Csng: This alarm applies only to the VI module and is obtained when the MTS-3000
detects a missing zero crossing in the AC line (i.e. more than 15 ms of no zero
crossings), and, as a result, iniates the power down sequence. If this alarm occurs,
power the system off and then on to restore the system to normal operation.