Lake Shore Model 642 Electromagnet Power Supply User’s Manual
3-8
Installation
3.6
POWER SUPPLY CONNECTOR
The Power Supply connector provides terminals for an optional water flow switch and an optional cooling water control
solenoid valve. The flow switch must have a normally closed contact rated at 5 V at 10 mA contact closure is required to
enable the Model 642 output. If a switch is not used, a jumper is required. 24 VAC at 1 A is provided to operate a water
control solenoid valve for the power supply cooling water. This output is controlled by the power supply, either
automatically via software, or manually through the Internal Water menu.
Water control is desirable to reduce water consumption when the water comes from a municipal facility. Turning the
water off when it is not required also reduces the probability of condensation within the power supply and connecting
tubing. If the cooling water comes from a facility chiller system, condensation is not usually a problem and a control
valve is not required. Figure 3-10 shows some typical Power Supply Connector wiring.
NO VALVE OR SWITCH
VALVE ONLY
SWITCH ONLY
VALVE AND SWITCH
Figure 3-10. Typical Power Supply Connector Wiring
3.7 COOLING
WATER
Two 10 mm (0.38 in) hose barbs are provided to connect to cooling water. The connection to the cooling water source
should be made with two 10mm (3/8 in) I.D. fiberglass reinforced hoses and two 20mm (25/32 in) adjustable hose
clamps. In addition, we recommend the installation of a sediment filter in the input line. A typical water hose connection
is shown in Figure 3-11.
The cooling water must be clean and free from sediment, salt and other contaminants, which might clog or erode the
water fittings. A minimum flow rate of 5.7 L (1.5 gal) per minute is required with a minimum pressure of 34 kPa (5 psi)
and a maximum pressure of 552kPa (80 psi). The temperature must be kept above 15
˚
C to avoid condensation and below
30
˚
C to ensure adequate system cooling. If water is drawn from a local municipal water source, the optional water valve
should be installed for economy and to prevent condensation (See 3.6 Power Supply Connector). If water is supplied by
a facility chiller, a valve can still be used but is not required.
CAUTION:
Dot use de-ionized water because it is corrosive to the water fittings inside the Model 642.
HOSE BARB FITTING
ON BACK PANEL OF 642
ADJUSTABLE HOSE CLAMP
REINFORCED HOSE
Figure 3-11. Typical Water Hose Connection
Figure 3-12 shows the connections required when a water valve is used. The optional solenoid water valve is supplied
mounted to a bracket which mounts to the rear of the Model 642 as shown in Figure 3-12. Hose connections are made as
shown in Figure 3-11.
