INFICON MDC-370 Thin Film Deposition Controller - Manual (Page 103)

MDC-370 DEPOSITION CONTROLLER
8. CONTROLLER INSTALLATION
8.1 MOUNTING
The MDC-370 is intended for rack mounting. For maximum operating ease it
should be mounted at approximately eye level. If the MDC-370 is mounted in a
rack containing other heat generating equipment, care should be taken that there is
adequate ventilation to assure that the ambient temperature does not exceed the
MDC-370’s ambient temperature rating.
8.2 PROPER GROUNDING
The MDC-370 was designed for maximum noise immunity and in most cases will
require no special grounding precautions. In the event that noise sensitivity is
noted in unusually noisy environments, more attention to proper grounding may
be required. It is important that the rack in which the MDC-370 is mounted is
tightly grounded to the vacuum station. This grounding is best accomplished by a
multipoint mechanical connection through the structure itself or through
grounding straps. Grounding straps should be as wide as practicable and can be
foil or braid.
A small diameter copper conductor does not create an effective ground.
Although the D.C. resistance measured with such a connection may be low, the
inductance can be high allowing rapidly changing currents to create large
potential differences over the length of the ground wire. Multiple current paths
significantly reduce the inductance, and since the inductance of a conductor is
inversely proportional to it’s radius, wide straps will have the lowest inductance.
In particularly noisy environments it is desirable to ground the MDC-370 to the
rack frame, or other good ground, by means of a grounding strap connected to the
grounding lug provided on the rear panel.
8.3 EXTERNAL CONNECTIONS
Most external connections are made through the rear panel (See Figure 8-2). The
Remote Power Handset connector and a temporary RS-232 connection are,
however, located on the front panel (Figure 8-1).
8.3.1 POWER
The power receptacle is an internationally approved type. A fuse, voltage
selection board and RFI filter are part of the power receptacle assembly. The
power plug must be removed to change the fuse or the voltage selection board
position.
8.3.2 VOLTAGE SELECTION
The voltage selection is preset at the factory for a nominal input of 120 volts.
However, the following nominal input voltages can be selected: 100, 120, 220,
240. For a 230 volt supply voltage, the 240 volt option should be used. Selection
CONTROLLER INSTALLATION 8-1