Johnson Controls AS instruction manual 8.0Operation, 7.3Electrical connection

7.3Electrical connection

Make the electrical connection only after the hydraulic connection has been completed; set up the motor control system in conformity with the technical standards and regulations in force (EN 60204-1): in particular a manual electric power switch must be installed with adequate current switching capacity; devices for overcurrent and overload protection (e.g. fuses, automatic switches, etc.) must also be fitted, plus, if necessary, a device to prevent accidental restarting.

Check that the main frequency and voltage and the available power are suitable for the motor installed. All the material used for the electrical connection (cables, cable clamps, switches and shielding) must have a suitable level of protection for the environment in which it is installed.

Be sure to use cables of sufficient cross-section for the current shown on the motor plate so as to prevent them from overheating. Before doing anything else, make the motor’s earth connection, using the terminal on the motor and a cable of sufficient cross-section. The cables may be connected to the terminal board using either a delta or star arrangement. Follow the data given on the motor plate for the main voltage, as shown in the diagram in fig 2; ensure that the terminals are clean and tight and not under stress.

When starting, the motor’s current absorption increases briefly to 5-6 times the nominal value. If the mains supply is unable to sustain this increase in absorption, use a star-delta starter or other kind of device (e.g. an autotransformer).

Johnson Pump will accept no responsibility for damage to property and/or injury to persons caused by failure to comply with technical standards and regulations in force.

Lower	Higher
voltage	voltage

Fig 2

8.0Operation

8.1Preliminary operations and starting

When first starting, fill the pump with liquid so as to create the pressure drop required for suction. When starting subsequently the quantity of liquid that remains in the pump will be sufficient to ensure self-priming even if the pipe is empty. Make sure that the pump does not become completely empty in the event of installation under a vacuum or to a siphon. If necessary, fit a check valve.

•Check that the pump turns freely under hand pressure.

•Check that the clamp joining the pump casing and the cover is well tightened and that

it cannot be easily unscrewed by hand. The tightening of the clamp must be carried out by means of a key and not by hand.

•Check that the pump turns in the market direction.

•Check that any gate valves installed on the suction and discharge pipelines are open.

•Start the pump and check the turns direction; before restarting it is extremely important to

IM-AS/02.00 GB (0412) 7