57
Connect Relay Trip contacts to
STOP/MONITOR
terminals.
Note: If relay is solid state, microprocessor-based, or has a DC auxiliary relay that
requires a DC voltage prior to applying test currents, connect the appropriate relay
terminals to the Master Unit
DC AUX
terminals. With the arrow key, highlight the
DC
VOLTS
and press the
DC
Button. Increase the DC voltage output by rotating the Master
Unit Control Knob until proper voltage is applied.
Connect the Master Unit
AC CURRENT MAIN
,
45 A
output terminal and common
return to the relay terminals so that the test current will energize the Operating Coil
(Element) and one Restraint Coil (Element). Connect the Slave Unit
AC CURRENT
MAIN
,
45 A
output terminal and common return to the relay terminals, so that the test
current will energize the two Restraint Coils (Elements) in series. Note: Observe
polarity. Connect the two Common returns to the same relay terminal.
1.
AC AMPERES
should be highlighted on both Master and Slave units.
2.
With both units
MODE SELECT
set to
MAINT.
(MAINTAIN), press the ARM M/S
button on both units. Press the Master Unit
INIT
button.
3.
Rotate the Slave Unit Control Knob and increase current until the desired
restraint current is set.
4.
Rotate the Master Unit Control Knob and increase current until the
TRIP
LED
turns
ON
(and the horn sounds, if the horn is set on).
5.
Read and record the two currents. Turn off the
AC CURRENT MAIN
outputs off
by pressing the Master Unit
SOURCE RESET
button (turns all outputs off,
including the DC AUX voltage). To repeat the test for other Restraint current
values, simply press the DC AUX button, ARM M/S buttons and the Master INIT
button. The outputs will turn on at the same values where you turned them off.
NOTE: For a relay set to a slope (differential characteristic) of 25 %, typical values
would be 20 Amperes Restraint Current (Slave Unit) and 5 Amperes Operating
Current (Master Unit).
Summary of Contents for SR-98
Page 93: ...87...
