GE Industrial Solutions MX350 Instruction manual - Manual (Page 81)

CHAPTER 5: SETPOINTS CONFIGURATION SETPOINTS
MX350 AUTOMATIC TRANSFER CONTROL SYSTEM – INSTRUCTION MANUAL 5–7
If the sources remain paralleled for 500ms, another alarm message will be triggered. This
alarm can be programmed to trigger a programmable output which, in turn, can be used
to shunt trip, and thus disconnect, either source. If enabled and wired into the customer
circuit, the shunt trip will ensure that the two sources will not remain paralleled for an
extended period of time.
All Closed Transition type switches are equipped with an audible alarm (horn). This output
is activated when:
1.
The two sources don't become synchronized within 60 seconds while attempting to
transfer to the other source.
2. If the ATS fails to disconnect from the source from which it is transferring away and
both sources remain paralleled for more than 100ms (Open Last Closed feature is
being activated).
3. The Open Last Closed feature fails and the controller issues a shunt trip command to
the generator breaker.
In order to silence the horn, the operator must navigate to the Status screen, highlight the
'Audible Alarm' message, and then press the Horn Silence softkey . Alternatively, the user
may press the ALARM RESET key located on the front panel.
Figure 3: Front Panel Alarm Reset key
The table below describes the different timers that are active during the different switch
transition types.
Chicago Transfer Alarm Panel (CTAP) option
If a switch has been ordered with the CTAP option, the Alarm light will illuminate and the
horn will sound when the load is connected to the non-preferred source. In order to
silence the horn, the operator must navigate to the Status screen, highlight the 'Audible
Alarm' message, and then press the Horn Silence softkey . Alternatively, the user may
press the ALARM RESET key (see above) located on the front panel.