
FIELD REPAIR/SERVICE
BLANKETROL III, Model 233
OPERATION AND TECHNICAL MANUAL
Page 104 of 131
F.
Discard the defective beeper and reinstall the enclosure panels and the top of the
unit. Installation is reverse of removal.
5-17. REPLACEMENT OF THE POWER CORD
A. Disconnect and remove each of the wires from the electrical box. The white and black
wires are terminated with slide-off connector. The green wire is terminated with an eyelet
connector that is disconnected by unscrewing the ground screw.
B. Unfasten the power cord from the divider pan by removing the brass washer and
8/32x½” screw from the 3/8” nylon clamp.
NOTE: 230 VOLT only.
Power Cord will be secured at the lower right corner of the mounting
bracket located at the left side of the frame using one (1) 5/16” nylon clamp, one (1) 8/32x½”
screw and one (1) brass washer.
C. Remove the strain relief from the unit by depressing the tabs that extend into the unit.
D. Remove the power cord from the unit.
E. Insert new power cord into the strain relief and install strain relief back into the unit.
F.
Secure the power cord to the divider pan with (1) 3/8” nylon clamp (ID#50119), one (1)
8/32x
½” screw (ID#60201), one (1) brass washer (ID#60632), then
tighten. Feed the wires into the terminal block and wire according to the drawing.
a. For 230 Volt: See NOTE above.
G. Connect the wires in the same locations in which they were disconnected.
5-18. LEAKAGE CURRENT
The BLANKETROL III unit should periodically be checked for Leakage Current prior to general floor
use. Using an electrical safety analyzer, measure the electrical Leakage Current under the
following conditions: Power ON & Off, polarity normal and reverse. The Leakage Current should be
less than 300 microamps under all conditions for 115 Volt. The Leakage Current should be less
than 500 microamps under all conditions for 230 volt. If a BLANKETROL III unit has Leakage
Current that exceeds 300 microamps in the 115V unit or has a significant increase in Leakage
Current, the cause should be investigated and individual components of the unit must be electrically
isolated and measured. All readings may be affected by the age of the components, ambient
temperature, and humidity.
5-18.1. Arranging the Equipment
A. Plug the BLANKETROL III power cord into a Leakage Current tester and plug the tester
into a power source.
B. Attach the input lead wire of the tester to a grounding point of the BLANKETROL III unit.