Lakeshore Learning Materials 642 - Manual (Page 32)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
3-4 Installation
Line Voltage Selection (Continued)
Changing line voltage is accomplished by moving four wires to the required voltage terminals. The required location is
shown in Figure 3-2. To change the voltage setting, loosen the four terminal screws in the voltage-change terminal block
to which the wires are connected and move the wires to the required voltage position. The wires are held in place in a
locator card to maintain their spacing and prevent mis-wiring. The screws in the new terminal location must be loosened
four full turns to allow the entry of the wires. Move all four wires at once by lifting the locator card to extract the wires
from the terminals. Move the card and wires to the correct location and insert the wires completely so that the card rests
against the terminals. While holding the locator card in place to keep the wires fully inserted, tighten the terminal screws.
The recommended torque requirement is 0.5 Nm. Also, tighten the four terminals where the wires were previously.
TERMINAL SCREW
WIRE FERRULE
VOLTAGE SELECTOR CARD
VOLTAGE INDICATOR KEY
Figure 3-2. Voltage Change Detail
3.3.2 Circuit Breaker Setting
The circuit breaker is an important safety feature of the Model 642. The required current setting depends on the voltage
for which the unit is wired. (Refer to Table 3-2.) Verify that the circuit breaker is set correctly for the line voltage being
applied to the unit. To set the breaker trip current, open the access cover on the circuit breaker and adjust the current
setting dial to the correct value. (See Figure 3-3.)
NOTE: The circuit breaker has an automatic reset feature. If the breaker trips, it will reset within a few minutes and
the unit can be restarted. If the units trips again after a short time, the trip current may be set incorrectly.
CURRENT SETTING DIAL ACCESS COVER
Figure 3-3. Circuit Breaker