Sel SEL-DTA2, Instruction Manual

Page: 33 / 44

Date Code 20020329
SEL-DTA2 Instruction Manual
Section 4
Installation
Installing the DTA2
Mounting
The SEL-DTA2 is designed for mounting by its front vertical flanges in a 19"
vertical relay rack. It may also be mounted semi-flush in a switchboard panel.
Use four #10 screws for mounting. See
Figure 4.1 on page 4.2 for a mounting
and drill plan.
Interface Cables
Table 4.1 lists cables that interface the DTA2 to other devices.
Power Connections
Connect appropriate dc voltage to terminals 1 (+) and 2 (–) on the back panel.
Connect ground to terminal 3 (GND - ground).
The 48/125V and 125/250V power supplies can operate from either ac or dc
voltage and connection polarity is not important.
See Figure 5.1 on page 5.1 in Section 5: Maintenance and Testing for terminal
locations. Table 2.2 on page 2.8 in Section 2: Specifications shows terminal
numbering.
Communications
Circuits
Connections to the two EIA-232 serial communications ports are made via
two 9-pin connectors labeled Port 1 and Port 2 on the rear panel.
NOTE:
Ground pins on connectors
should not be relied upon for safety
grounding.
Low-energy, low-voltage MOVs and passive RC filters protect the
communications circuits. Minimize communications-circuit difficulties by
keeping the length of the EIA-232 cables as short as possible. Cable length
should never exceed 100 feet. Use shielded communications cable for lengths
greater than ten feet.
Jumper Selection
Figure 4.2 on page 4.3 provides the location and configuration information for
all jumpers. They are easily accessed by removing the top cover.
Table 4.1 DTA2 Interface Cables
DTA2 External Device Connector on Cable SEL Cable No.
Port 1 DTE
a
a
Data Terminal Equipment (computer, terminal, printer, etc.)
25-pin Male C223A
Port 1 DTE
a
25-pin Female C227A
Port 1 DTE
a
9-pin Female C234A
Port 1 PRTU 9-pin CON-X-ALL C231
Port 2 200/300 Series Relays 9-pin Male C272A
Port 2 100 Series Relays 9-pin CON-X-ALL C372A
Analog Terminal Block Adapter 25-pin Male C701