Product Manual
9
Check with a qualified electrician or service
personnel if the grounding instructions are not
completely understood, or if in doubt as to
whether the tool is properly grounded.
Repair or replace damaged or worn cord
immediately.
8.2 Voltage Conversion
The single phase models (ET-1C) are
designed for 115 volt or 230 volt operation. They
are pre-wired for 230 volt. The three phase
models (ET-3C) are designed for 230 volt or
460 volt operation. They are pre-wired for 460V.
To switch voltage:
1. Disconnect trolley from power supply, and
disconnect the pendant cord from the trolley.
2. Remove the two screws and lock washers
on the underside of the housing (see Figure
10) and slide the protective band out of the
way. Remove the housing.
3. Carefully pull the plug out of the current
socket and insert it into the new socket (see
Figure 10). Make sure the notch on the plug
fully engages the socket.
4. Re-install the housing, re-position the
protective band, and insert the screws and
lock washers. Tighten the screws securely.
Figure 10
8.3 Inspecting Trolley Motion
1. Before closing the circuit breaker and testing
the trolley, check that wiring has been
complete. If the trolley cannot be observed
when the circuit breaker is closed, station an
observer within sight of the trolley to report
any movement when power is applied to the
trolley. Be prepared to disconnect power if
trolley motor starts when the power is
applied. The trolley must remain motionless
when power is applied. Find and correct any
problems before continuing.
Test the motion of the hoist also:
2. With no load on the load hook, press the UP
button very briefly and observe hoist action.
The hook should move upward. (Two speed
models have a two-position UP button.
Press the button only part way to operate lift
motor at slow speed, press fully to operate
at high speed.)
3. If no motion occurs when the UP button is
pressed and the hoist is connected to a
three phase power supply, the power supply
wires are incorrectly positioned.
4. Switch any two of the three supply wires at
the power source. Do not attempt to rewire
the hoist/trolley circuit or pendant
controls for this problem. Use the same
safety precautions when reversing two of the
supply wires as was used when the wires
were originally connected.
5. Re-connect power and test hoist and trolley
movement again without load. Run hoist to
the complete lifting height to ensure limit
switches are operating properly.
Refer to your hoist manual for more detailed
instructions on operation and testing of the hoist.
8.4 Extension Cords
If an extension cord is necessary, make sure the
cord rating is suitable for the amperage listed on
the trolley’s motor plate. An undersize cord will
cause a drop in line voltage resulting in loss of
power and overheating.
The chart in Figure 11 shows the correct size
cord to use based on cord length and motor
plate amp rating. If in doubt, use the next
heavier gauge. The smaller the gauge number,
the heavier the cord.
Recommended Gauges (AWG) of Extension Cords
Amps
Extension Cord Length *
25
feet
50
feet
75
feet
100
feet
150
feet
200
feet
< 5 16 16 16 14 12 12
5 to 8 16 16 14 12 10 NR
8 to 12 14 14 12 10 NR NR
12 to 15 12 12 10 10 NR NR
15 to 20 10 10 10 NR NR NR
21 to 30 10 NR NR NR NR NR
*based on limiting the line voltage drop to 5V at 150% of the
rated amperes.
NR: Not Recommended.
Figure 11