Omega Engineering OMB-NETSCAN, Руководство пользователя

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Hardware 7-17
CSN/Relay Card Specifications
Number of Channels:
•
16 (2 groups of 8 channels)
Relay Contacts (Manufacturer’s Ratings):*
•
8 Amps, 125-250 VAC Resistive
•
5 Amps, 30 VDC Resistive
Card Contact Ratings:
•
8 Amps maximum on group commons
Contact-to-System Isolation:
•
500 Volts (AC or DC)
*Manufacturer’s ratings for the relays used on the CSN/Relay Card.
Expansion Chassis, CSN/Exp (Option)
You can add up to 64 additional analog channels to NetScan by using a CSN/Exp expansion chassis. The expansion
chassis accepts the same types of signal conditioning cards as the NetScan unit, and is powered and controlled by the
NetScan unit.
Expansion channels are accessed in the same way as channels in the master NetScan unit. When the main unit
detects the presence of the expansion chassis (during its power-on sequence), the system makes the additional
channels available to the user. The
U8
command is available to query NetScan for the total number of channels in
the system.
Note: Only one expansion chassis can be connected to a NetScan unit.
Note: The rear panel of the expansion chassis contains no controls, indicators, input or output connections.
Connecting the Expansion Chassis
A ribbon cable electronically connects the expansion chassis to the main unit. No additional power or interface
cables are required. A set of mounting blocks and machine screws is used to physically connect the expansion
chassis to NetScan. Perform the following steps to install an expansion chassis.
:$51,1*
Before connecting an expansion chassis to NetScan, power down NetScan and disconnect the
unit from power. In addition, power down and disconnect all devices from the system.
Failure to do so could lead to personal injury or death.
&$87,21
Use approved ESD precautions, including static-free work area and grounded wrist strap,
when handling circuit boards and electronic components. Failure to do so could cause
equipment damage due to electrostatic discharge.
Note: Only one expansion chassis can be connected to a NetScan unit
1. Ensure the NetScan is not connected to any power source.
2. Remove two upper side screws (near front of unit, and on side of unit) and slide top cover plate free of NetScan.
Note that this plate will be reused as the cover plate for the expansion chassis.
3. Using machine screws (A) provided, install two mounting blocks to the inner sides of the NetScan unit, as indicated
by the following figure.