Cut Sheet

Page 32
SE-330HV Neutral-Grounding-Resistor Monitor Rev. 5-I-091115
8. WARRANTY
The SE-330HV Neutral-Grounding-Resistor Monitor is
warranted to be free from defects in material and
workmanship for a period of five years from the date of
purchase.
Littelfuse Startco will (at Littelfuse Startco’s option)
repair, replace, or refund the original purchase price of an
SE-330HV that is determined by Littelfuse Startco to be
defective if it is returned to the factory, freight prepaid,
within the warranty period. This warranty does not apply
to repairs required as a result of misuse, negligence, an
accident, improper installation, tampering, or insufficient
care. Littelfuse Startco does not warrant products
repaired or modified by non-Littelfuse Startco personnel.
9. TEST PROCEDURES
NOTE: Ensure the real-time clock is set. See Section 4.2.
9.1 RESISTOR-FAULT TESTS
Perform tests with system de-energized and supply
voltage applied to the SE-330HV.
9.1.1 C
ALIBRATION AND OPEN TEST
Test Equipment: 100-k and 200-k, 1/4-watt, 1%
calibration resistors (calibration resistors
supplied with SE-330HV).
Procedure:
 Remove connections to terminals 6 and 7.
 Connect the 100-k resistor to terminals 6 and 7.
 Set switch S5 to the 100-k position.
 Perform calibration as per Section 2.2.
 The CALIBRATED LED should be on. Press RESET.
 Remove the 100-k resistor and wait for the resistor-
fault trip time.
PASS: The SE-330HV should trip on resistor fault.
 Connect the 200-k resistor to terminals 6 and 7.
 Set switch S5 to the 200-k position.
 Perform calibration as per Section 2.2.
The CALIBRATED LED should be on.
 Press RESET.
 Remove the 200-k resistor and wait for the resistor-
fault trip time.
PASS: The SE-330HV should trip on resistor fault.
N
OTE: Resistor-fault-trip reset can take up to one second.
9.1.2 V
OLTAGE TEST
Test Equipment: 0 to 250 Vac voltage source, multimeter, and
ER sensing resistor.
N
OTE: Use an isolation transformer if the test-voltage source
does not provide dc continuity for the SE-330HV resistance-
measuring circuit.
N
OTE: Applying the test voltage to the R and G terminals will
damage the SE-330HV and the ER sensing resistor. The V
N
TRIP LEVEL is the trip voltage at terminal N, not terminal R.
Procedure:
 Connect the ER sensing resistor to the SE-330HV and
calibrate the SE-330HV.
 Disconnect the wire from sensing-resistor terminal N. A
resistor-fault will occur.
 Set the voltage source to 0 V.
 Connect the voltage source between sensing resistor N and
G terminals.
 Set the V
N
TRIP LEVEL (VAC) to 100.
 Press RESET.
 The RESISTOR FAULT TRIP LED should be off.
 Increase the test voltage to 120 Vac for 100-k sensors or
240 Vac for 200-k sensors and wait the resistor-fault
trip time.
PASS: The SE-330HV should trip on RESISTOR
FAULT. A time-delayed ground-fault trip follows the
resistor-fault trip if neutral voltage persists after the resistor
fault. For legacy units with firmware revision 6 or less,
this does not apply.
9.2 S
ENSING-RESISTOR TEST
Test Equipment: Multimeter.
Procedure:
 Disconnect the sensing resistor.
 Measure the resistance between sensing-resistor terminals
R and N.
PASS: Resistance should be between 98 and 102 k for
100-k sensing resistors. Resistance should be between
196 and 204 k for 200-k sensing resistors.
 Measure the resistance between sensing-resistor terminals
R and G in both directions.
PASS: Resistance should be greater than 10 M in
both directions.
9.3 A
NALOG-OUTPUT TEST
Test Equipment: Multimeter with a mAdc scale.
Procedure:
 Connect the 4–20-mA output as a self-powered output as
shown in Fig. 3. Measure the current from terminal 20 to
terminal 21.
PASS: With no CT current, the analog output should be
4 mA.
 Output is linear to 20 mA. Output is 20 mA when CT-
primary current is equal to the CT-primary rating.