Operation After A Power Recovery - Edwards STP-iS2207 Series Instruction Manual

Table 33 shows the states of LED output and the "X2 REMOTE" output signals at a power failure.
7
Rotational
speed
6,000 rpm or
more
Less than
6,000 rpm
Table 33 - 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, a failure signal is reset between FAILURE OUT pins (8)-(21) and (9)-(21) 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.
MT-89E-001-C
Page 130
STP-iS2207 Series Turbomolecular Pump
Duration of
power failure
POWER
LED
Approx. 2 sec.
Extinguish
or longer
Shorter than
approx. 2 sec.
Extinguish
REMOTE output signal
LEDs
(REMOTE X2)
ALARM
FAILURE
LED
N.O.
Illuminate Close
Continues as before
Extinguish Open
N.C.
Open
Close