SCU-1600 Control Unit for Turbomolecular Pump
March 10 106 Issue 1-a
7
MAINTENANCE
Table 33 shows the status of LCD, LEDs, and REMOTE output signals at a power failure.
LCD LEDs
REMOTE output signal
(REMOTE X7)
ALARM
Rotational
speed
Duration of
power failure
Error
messages
POWER
LED
FAILURE
LED
POWER
N.O. N.C.
Approx. 2 sec.
or more
Mains
Failure
Extinguish Illuminate Open Close Open
Backup
rotational speed
or more
Less than
approx. 2 sec.
Continues as before
Less than
backup
rotational speed
OFF Extinguish Extinguish Open Open Close
Table 33 - States of LCD, LEDs and REMOTE output signals at a 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 ALARM OUT pins (14)–(33)
and (15)–(33) of the "X7 REMOTE" connector.
2. When the START operation is performed after a power recovery, the STP pump reaccelerates
even while it is in BRAKE state.
However, the SCU-1600 may detect excessive vibration when power is recovered after the rotor
lands on the touch down bearing (see Section 7.1.4). In this case, the STP pump once stops and
cannot reaccelerate until the RESET operation completed (see Section 4.5.7).
Note: It is recommended to establish a procedure so that the power can be supplied to the
SCU-1600 immediately after a power recovery.
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