Edwards SCU-350 Series

SCU-350 Series Control Unit for Turbomolecular Pump
MT-21E-201-E
Page 42
4
OPERATION
Pin Description
Terminals for outputting the power (12 V DC) for driving remote
signals.
CAUTION
NEVER use these terminals for the purpose except REMOTE
operations. DO NOT connect these terminals to another power
line. Doing so causes a failure.
Terminals for inputting the START signal. The following three
methods are available:
1) Short the circuits between (2)-(3) and (1)-(4). Then, shorting
the circuit between (4)-(5) for 0.3 seconds or more causes the
STP pump to start. When this signal is input simultaneously
with switching ON the breaker on the rear panel, short the
circuit for 5 seconds or more.
2) Short the circuit between (2)-(3). Then, shorting the circuit
between (1)-(5) causes the STP pump to start.
3) Input 25 V AC or 12 to 48 V DC between (3)-(5) to start the
STP pump. With DC input, the (+) side can be connected to
either (3) or (5).
Terminals for inputting the STOP signal. This STOP signal has
priority over the START signal.
1) When 1) above is used to start the STP pump, open the
circuit between (1)-(4) to stop the pump.
2) When 2) above is used, open the circuit between (1)-(5) to
stop the pump.
3) When 3) above is used, open the circuit between (3)-(5) to
stop the pump.
Terminals for inputting the abnormality RESET signal.
1) When 1) or 2) above is used, shorting the circuit between
(1)-(6) for 0.3 seconds or more turns off the "FAILURE" LED.
2) When 3) above is used, input 25 V AC or 12 to 48 V DC
between (3)-(6) for 0.3 seconds or more to turn off the
"FAILURE" LED.
With DC input, the (+) side can be connected to either (3) or (6).
Table 7 - I/O TB2 terminal block
CAUTION
When performing all of the START, STOP, and RESET operations using method 3 shown in the
above table, 25 to 250 V AC can be input. In this case, attach a
metallic cover or a similar part to the
terminal block to ensure the safety.
(3)
(5)
COMMON
IN
START
IN
(3)
(4)
COMMON
IN
STOP
IN
(3)
(6)
COMMON
IN
RESET
IN
(1) (2)
+12V
OUT