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CHAPTER 3:
Installation
Model 648 Electromagnet Power Supply
3.4.1 Line Voltage
Selection
The Model 648 has seven AC line voltage configurations covering seven different
input voltages. The nominal voltage and voltage tap setting and the circuit breaker
current setting for each configuration is shown in TABLE 3-2. Verify that the unit is
configured correctly for the voltage being applied to the unit before applying power.
Voltage and current selection
Voltage tap
Circuit breaker
200 V
50 A
208 V
50 A
220 V
46 A
230 V
46 A
380 V
37 A
400 V
37 A
415 V
37 A
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, follow these procedures.
1. Loosen the four terminal screws in the voltage-change terminal block to which
the wires are connected.
2. Move the wires to the required voltage position.
The wires are held in place in a locator card to maintain their spacing and prevent
miswiring.
3. Loosen the screws in the new terminal location four full turns to allow the entry
of the wires.
4. Move all four wires at once by lifting the locator card to extract the wires from the
terminals.
5. Move the card and wires to the correct location and insert the wires completely
so that the card rests against the terminals.
6. 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.
7. Tighten the four terminals where the wires were previously.
Voltage change detail
3.4.2 Circuit Breaker
Setting
The circuit breaker is an important safety feature of the Model 648. The required
current setting depends on the voltage for which the unit is wired (refer to TABLE 3-2
for the correct setting). 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
(FIGURE 3-3).
TABLE 3-2
FIGURE 3-2
