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SE-400 Ground-Fault-Relay Test Unit Rev. 1-A-072115
1. GENERAL
The SE-400 is an ac current source with a
programmable output. The magnitude and duration of
the output can be selected with front-panel switches so
that ground-fault-relay coordination can be confirmed at
the push of a button.
The current output is transformer isolated from supply
voltage.
2. OPERATION
2.1 FRONT-PANEL CONTROLS
2.1.1 AMPERES
The AMPERES switch has four push buttons and a
two-digit numeric indicator to adjust current output to
the desired value. The range is 0.5 to 9.9 A. If a value
below 0.5 is selected, there will be no output.
2.1.2 SECONDS
The SECONDS switch has four push buttons and a
two-digit numeric indicator to adjust output duration.
The range is 0.1 to 9.9 s, or select 0.0 for continuous-
output operation.
2.1.3 TEST
Press TEST for an output burst of the magnitude and
duration selected by AMPERES and SECONDS. Press
TEST again to stop a continuous-output operation.
2.2 INDICATION
The two-digit LED display indicates the magnitude of
the output current for the duration of the output burst.
The centre decimal point serves as a supply voltage
indicator. A decimal point on the right side of the
display is used to indicate a thermal-limit condition.
2.3 THERMAL LIMIT
When the SE-400 is used in the continuous-output
mode, the internal circuit temperature can reach the
thermal-limit temperature. To prevent damage to the
SE-400, the current output is disabled and the thermal-
limit indicator turns on. The output remains disabled
until the temperature has fallen to a safe level, at which
time the thermal-limit indicator turns off and the output
is enabled.
3. INSTALLATION
SE-400 outline and mounting details are shown in
Fig. 1. Panel-mounting procedures are shown in Fig. 2.
Connect L1 and L2 to supply voltage using L2 as N.
Connect ground terminal 1 ( ) to ground. Loop an
output conductor through the windows of the ground-
fault CT's connected to the ground-fault relays under test.
Connect one end of the output conductor to terminal 1
(OP1) and the other end to terminal 12 (OP2). For
output-conductor lengths under 40 ft, use 14 gauge wire.
For output-conductor lengths over 40 ft and up to 80 ft,
use 12 gauge wire.
If remote operation is required, connect a normally
open momentary contact to terminals 8 and 9 (RMT1 and
RMT2). Low-level contacts are recommended.
Typical connection diagrams are shown in Fig. 3.
4. TEST PROCEDURE
Set the required output current level0.5 to 9.9 A.
The recommended test current is 120% of the ground-
fault trip level of the device being tested.
Set the output duration0.1 to 9.9 s or 0.0 for push-on
push-off operation.
Press the TEST button. The ground-fault unit(s) being
tested should trip.
5. TROUBLESHOOTING
Problem:
No current output when the TEST button is pressed.
Possible Causes:
Loose output connections.
Resistance of the output wire is too high.
VA requirement of the load is too high.
Current is set to less than 0.5 A.
No supply voltage.
Thermal limit exceeded.
Power-supply fuse F1 open.
Troubleshooting:
Check the SE-400 operation by connecting a short
length of wire across the output terminals and
pressing the TEST button.
If using a remote test switch, check remote switch
operation and connection to the SE-400.
