ABB Relion 615 series Applications Manual page 34

Section 3
REM615 variants
28
GUID-7DC9E12B-6E3F-4778-BD6A-1C6A04058FE7 V1 EN
Figure 11: Emergency start and restart inhibit
The emergency start function (ESMGAPC1) allows motor startups although the
restart inhibit is activated. The emergency start is enabled for ten minutes after the
selected binary input (X120:BI1) is energized. On the rising edge of the emergency
start signal:
• Calculated thermal level is set slightly below the restart inhibit level to allow
at least one motor startup
• Value of the cumulative startup time counter STTPMSU1 is set slightly below
the set restart inhibit value to allow at least one motor startup
• Set operate values of the temperature stages in MPTTR1 function is increased
by 10 percent
• External restart inhibit signal (X100:PO1) is ignored
• Alarm LED 11 is activated
The external restart inhibit signal is ignored for as long as the emergency start is
activated. A new emergency start cannot be made until the emergency start signal
has been reset and the emergency start time of 10 minutes has expired.
The thermal overload protection function (MPTTR1) detects short- and long term
overloads under varying load conditions. When the emergency start request is
issued for the emergency start function, it activates the corresponding input of the
thermal overload function. When the thermal overload function has issued a restart
blocking, which inhibits the closing of the breaker when the machine is overloaded,
the emergency start request removes this blocking and enables the user to start the
motor again.
The restart inhibit is activated for a set period when a circuit breaker is opened.
This is called remanence voltage protection where the motor has damping
remanence voltage after circuit breaker opening and reclosing after a too short
1MRS756885 A
REM615
Application Manual