1.2
De scrip tion
The EXDC controls the electrical supply for a BOC Edwards EXT70, EXT70H,
EXT250, EXT255H, EXT351 or EXT501 turbomolecular pump.
The EXDC has no manual controls and can only be operated through the logic
interface. To operate the EXT pump, you must therefore connect the EXDC to
your own control equipment and electrical supply (see Figure 3).
Two models of EXDC are available, the only difference between the two models is
the output power provided to the EXT pump: see Section 2.
1.3
Logic in ter face
The EXDC has a 9-way logic interface connector on the end of the logic interface
cable (Figure 1, item 3). You must use a suitable connector mating half (not
supplied) to connect the EXDC to your own equipment: refer to Section 2.3 for
the connector mating-half type and to Section 3.4 for the electrical connections.
Refer to Table 1 and Figure 3 for detailed information about the logic interface
connector pins and their uses.
1.4
In di ca tor LEDs
Refer to Figure 1. The EXDC has four indicator LEDs, as follows:
Phase LEDs (4)
These red LEDs are on when the corresponding
phase output to the EXT pump motor is on.
TMP Normal LED (5)
This green LED is on when the EXT pump is 80% or
more of full rotational speed.
You can use these LEDs as an aid to fault finding: refer to Section 5.2.
2
EXDC Tur bo mo lecu lar Pump Drive Mod ules
