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3 Installation
3.2 System Chassis
The physical dimensions and mounting hole spacing for the System
Chassis are given on Drawing D-67849. The System Chassis is designed
to fit into a standard 19" rack. It requires 7" panel height and 12.3" depth
plus allowance for cabling behind the panel.
3.2.1 Location
The System Chassis is designed for installation in a NON HAZARD-
OUS Environment.
3.2.2 Power
The model 1220 is designed to operate from 100/240VAC @ 50/60
Hz. Ventilation must be provided to dissipate heat generated within the
control unit. Natural convection is sufficient to cool 16 Channel Modules.
However, if more are mounted in the same chassis, forced ventilation
should be used.
3.2.3 Electrical Connections
The primary power terminals are designated H(hot), N (neutral) and
GND (ground). Connections should be made in accordance with these
designations.
All electrical connections are available at the barrier-type terminal
strips located at the rear of the control unit. These facilities are shown on
the user interconnection drawing D-67850.
WARNING:
Relay contact connections are indicated as NC (normally closed), NO
(normally open) and C (common). These designations refer to the contact
state when the relay is de-energized.
Sensor connections are indicated as RD (red), WH (white) and BK
(black). These designations refer to the color of the sensor lead wires.
NOTE:
The cable shield should be connected to ground only
at one end of the cable (this applies for each sensor
connection). See Figure 3.1.
3-2
Disconnect primary power before making or
changing connections to any of the terminal
strips.
Teledyne Analytical Instruments
Model 1220
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