Goulds Pumps VS - IOM - Manual (Page 22)

the three motor leads into the corresponding
holes in the bottom of the rubber casing and
push them several inches out the top. Crimp
the motor leads into the corresponding con-
nectors, crimping the center one first. Bend
the cables into line with the holes in the casing
and slip the casing up until the connectors are
inside the holes and about
1 / 4 " from the top.
3. Mix the resin as directed. Cut off a corner of
the bag and squeeze all of the resin into cas-
ing. With the roll of tape on hand, fold the
bag, and tape the top of the bag snugly to the
power cable until the resin runs out over the
top. This will assure maximum coverage of
the resin and minimum size of the finished
splice. When the resin is firm to touch, the
splice may be immersed for testing.
In case of splicing cables of a six-lead motor
for y-delta starting, be sure that the extension
cable continue with the same lead colors and
phase designation as original motor leads.
This will ease up above ground connection to
the Y-Delta panel or an external delta connec-
tion for DOL start.
APPENDIX C – ELECTRICAL TESTS
1. MEASURING INSULATION
RESISTANCE (GROUND TEST)
The condition of the insulation around a conductor
can be determined by measuring the electrical
resistance between the conductor and ground.
This measurement can be made with a meggar or
an ohm-meter. The value is stated in ohms or
megohms (ohms x 1,000,000). High ohm values
indicate good insulation.
The basic procedure for measuring insulation
resistance is given below:
a. Turn off all power and disconnect the leads to
be tested from the electrical panel. Lock out
the panel.
WARNING
FAILURE TO TURN OFF THE POWER WILL
DAMAGE THE METER AND CAN CAUSE
SERIOUS OR FATAL SHOCK.
Failure to disconnect the leads can result in false
readings.
b. Set the meter selector knob to RX 100K or
RX 100,000 (some meters may not have RX
100K in which case EX 10K or EX 10,000
scale can be used). Clip the meter leads
together and adjust the meter to zero.
c. Unclip the leads and attach one of the meter
leads to the one of power cable leads or
motor leads. The other meter to the ground.
d. Do not touch any bare wires or allow bare
wires to come in contact with the ground or
metal. False readings will result.
e. If the meter needle is at either extreme end of
the scale, a more accurate reading can be
obtained by switching the selector switch to
another scale. Re-zero the meter each time
the selector switch is moved.
The readings obtained from power cables and
motor leads should be within the range specified
in Table C.1. Low readings indicate that the motor
windings are grounded or that the cable or splice
insulation is damaged. If low or marginal readings
are obtained on a new installation the problem
should be corrected before proceeding with the
installation.
2. MEASURING RESISTANCE
BETWEEN LEADS (MOTOR
WINDING RESISTANCE)
The general conditions of motor windings can be
determined by measuring the resistance of the
motor windings (i.e. the resistance between the
motor leads) and comparing the measured resist-
ance with values given in the motor manual. The
resistance is measured with an ohm-meter and
the value is stated in ohms.
The basic procedure for measuring motor winding
resistance is given below.
a. Turn off the power and disconnect the leads to
be tested from the panel. Lock out the panel.
WARNING
FAILURE TO TURN OFF THE POWER WILL
DAMAGE THE METER AND CAN CAUSE SERIOUS
OR FATAL ELECTRICAL SHOCK.
Failure to disconnect the leads can result in false
readings.
b. Set the meter selector knob to ‘Rx 1’. Clip the
meter leads together and adjust the meter to zero.
c. Unclip the meter leads and attach them to the
motor leads.
Resistance measured between the motor leads
prior to splicing the power cable to the motor leads
should be within the motor winding resistance
limits specified in the motor manual.
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