Instruction manual

7-15 Power Check
1) Open the emergency stop by twisting the red
knob. It should spring open. This should
cause the main relay, K3, to energize.
2) Measure the AC input voltage with a
voltmeter at terminal 1 and 3 of the K3 relay
(Figure 728). If no voltage occurs, check the
fuse and bimetal protector per sections 7-5.
7-16 Brake Rectifier Check {Code #10917,
Pos. 10}
1) Push either the up or down button on the
control box cover. The motor should run.
2) While the motor is running, measure the AC
voltage to the brake rectifier by placing the
voltmeter probes on the AC screws of the
rectifier (left side terminals marked ~ ~). See
Figure 729 which shows 116.6 volts AC to
rectifier, OK.
3) The AC voltage to the rectifier should be the
same as the input power measured in
Section 7-12.
4) Measure the DC voltage from the rectifier.
Change the voltmeter to DC. Measure the
voltage output from the rectifier at the
positive(+) and negative(-) screw terminals (2
center screws) while pressing the UP or
DOWN button on the control box cover
(Figure 730, which shows 103.2 DC volts
from the rectifier, OK). It should read
approximately 110 volts. If not approximately
110 volts, replace the rectifier.
For 220 V XE301P: If not approximately
220 volts, replace the rectifier.
58
Figure 729
WARNING
The following checks are performed with power to
the hoist motor. Whenever power is applied to the
hoist, use extreme caution especially with the
control box open as part are energized. Only trained
and qualified personnel should service the hoist to
avoid injury or death.
Figure 730
Figure 728
NOTE:
General service on the control box is now
complete.