Edwards SCU-800

SCU-800 Control Unit for Turbomolecular Pump
MT-49E-101-G
Page 52
4
OPERATION
Table 11 shows the rated contacts for relays CR1 to CR10 in Figure 30.
Resistance Load (COS Ø=1)
Rated Load
125 VAC, 0.5 A
24 VDC, 1 A
Rated Current
2 A
Maximum Contact Point Current
1 A
Maximum Open/Close Capacity
AC: 62.5 VA
DC: 30 W
Minimum Applicable Load
5 VDC, 1 mA
Table 11 - Rated contacts for relays CR1 to CR10
4.5.3 Remote setting
The parallel port (REMOTE X7) and serial port COM1 (REMOTE X3A/X3B), serial port COM2
(REMOTE X6) and STP-Link (X8) are fitted as standard. The network terminal such as the Lon or the
Devicenet is available as options.
It is necessary to set the hardware for the remote operation first. See Section 3.11, "Setting Mode" for
information and methods.
This section details the operating method using the parallel port (REMOTE X7), refer to Figure 20, "X7
REMOTE connector" for details of pin location. For the operating method using the serial port, refer to
Section 5 and Section 7.
4.5.4 Starting/Stopping the STP pump
There are two methods for the starting/stopping operation with the parallel port (REMOTE X7). Use
one of them.
Method
Starting the pump
Stopping the pump
1
1) Short the circuit between (1)-(21).
2) Short the circuit between (3)-(21) for 0.3
seconds or more. However, when inputting this
signal simultaneously with switching "ON" the
breaker on the rear panel, short the circuit
between (3)-(21) for 10 seconds or more.
Open the circuit between (1)-(21).
2
Short the circuit between (1)-(3).
In this case, (21) is not used.
Open the circuit between (1)-(3).
Table 12 - Starting/Stopping the STP pump during remote operation (REMOTE X7)