1.2 Description
TheEXDC controls the electrical supplyfor 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).
TwomodelsofEXDCareavailable,theonlydifferencebetweenthetwomodelsis
the output power provided to the EXT pump: see Section 2.
1.3 Logic interface
TheEXDC has a9-way logic interface connector on the endof the logicinterface
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
theconnectormating-halftypeandtoSection3.4fortheelectricalconnections.
Refer to Table 1 and Figure 3 for detailed information about the logic interface
connector pins and their uses.
1.4 Indicator 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) Thisgreen LED isonwhenthe EXT pumpis80%or
more of full rotational speed.
You can use these LEDs as an aid to fault finding: refer to Section 5.2.
2EXDC Turbomolecular Pump Drive Modules
