STP-iXA3306 Series Turbomolecular Pump
MT-82E-001-H
Page 142
7
SA
F
ET
Y
F
U
N
C
T
IO
N
S
Table 45 shows the states of LED output and the "X2 REMOTE" output signals at a power failure.
Rotational
speed
Duration of
power failure
LEDs
REMOTE output signal
(REMOTE X2)
POWER
LED
FAILURE
LED
POWER
ALARM
N.O.
N.C.
5,000 rpm or
more
Approx. 2 sec.
or longer
Extinguish
Illuminate
Open
Close Open
Shorter than
approx. 2 sec.
Continues as before
Less than
5,000 rpm
Extinguish Extinguish
Open
Open Close
Table 45 - States of LEDs and X2 REMOTE output signals at power failure
7.1.2
Operation after a power recovery
1.
The STP pump continues decelerating, and power failure detection is reset automatically.
At this time, the "POWER" LED illuminates and the "FAILURE" LED extinguishes.
Also, POWER OUT pins (9)-(28) is closed, and a failure signal is reset between FAILURE OUT
pins (14)-(33) and (15)-(33) of the "X2 REMOTE" connector.
2.
When the START signal is input after a power recovery, the STP pump reaccelerates even while
it is in BRAKE state.
When the START signal is input after a power recovery, the STP pump reaccelerates even while
it is in BRAKE state.
However, the control unit may detect excessive vibration when power is recovered after the rotor
lands on the touch down bearing (see 7.1.4). In this case, the STP pump once stops and cannot
reaccelerate until the RESET operation completed (see Section 4.7.2).
Note:
It is recommended to establish a procedure so that the power can be supplied to the STP
pump immediately after a power recovery.
