
2.7
Date Code 20090730
Instruction Manual
SEL-734 Meter
Installation
Making Rear-Panel Connections
Step 4. The circuit breaker (or equivalent approved disconnect device
appropriate for the country of origin) must comply with IEC
60947-1 and IEC 60947-3 and be identified as the disconnect
device for the equipment.
lists the SEL-734 power supply fuse requirements. Be sure to use
fuses that comply with IEC 60127-2. Note that the power supply range covers
two widely used nominal input voltages. The SEL-734 power supply operates
from 45 Hz to 65 Hz when ac power is used for the
POWER
input.
The SEL-734 accepts dc power input where the 125/250 Vdc supply also
accepts 120/240 Vac.
When connecting a dc power source, you must connect the source with the
proper polarity, as indicated by the
+
(terminal
A01
) and
–
(terminal
A02
)
symbols on the power terminals. When connecting an ac power source,
A01
is
hot (H), and
A02
is neutral (N).
The SEL-734 internal power supply exhibits low power consumption and a
wide-input voltage tolerance.
Power Supply Fuse Replacement
Disconnect or de-energize all
external connections before opening
this device. Contact with hazardous
voltages and currents inside this
device can cause electrical shock
resulting in injury or death.
!
DANGER
You can replace a blown or failed fuse in an SEL-734 power supply, or you
can return the SEL-734 to the SEL factory for fuse replacement. If you decide
to replace the fuse, perform the following steps to replace the power supply
fuse:
Step 1. De-energize the meter.
Have only qualified personnel service
this equipment. If you are not
qualified to service this equipment,
you can injure yourself or others, or
cause equipment damage.
!
WARNING
Step 2. Remove any cables connected to communications ports on the
rear panels.
Step 3. Loosen the eight rear-panel screws, and remove the meter rear
panel.
Equipment components are sensitive
to electrostatic discharge (ESD).
Undetectable permanent damage
can result if you do not use proper
ESD procedures. Ground yourself,
your work surface, and this
equipment before removing any
cover from this equipment. If your
facility is not equipped to work with
these components, contact SEL
about returning this device and
related SEL equipment for service.
!
CAUTION
Step 4. Locate the fuse on the power supply board.
Each circuit board corresponds to a row of rear-panel terminal
blocks. SEL-734 model 0734ES2-XX has only a main board,
CT board, PT board, and power supply. Model 0734ES2-6X
has an extra I/O board in addition to the other boards. Models
0734ES2-XX and 0734ES2-6X may also have an optional
communications board.
Step 5. Replace the fuse.
Step 6. When you are finished, slide the printed circuit board (PCB)
into the meter chassis. Replace the meter rear-panel cover.
Table 2.1
SEL-734 Power Supply Fuse Requirements
Nominal Power
Supply Voltage
Rating
Power Supply Voltage
Range
Fuse F1
Fuse Description
Model Number
24/48 Vdc
24–48 Vdc
T3.15AH250V
5 x 20 mm, time-lag, 3.15 A,
high break capacity, 250 V
Bussmann
S505-3.15A or
SCHURTER
SPT 0001.2509
110/120/220/240 Vac
110/125/220/250 Vdc
110–240 Vac (45–65 Hz)
110–250 Vdc
T3.15AH250V
5 x 20 mm, time-lag, 3.15 A,
high break capacity, 250 V
Summary of Contents for SEL-734
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