Operating manual liquid ring vacuum pumps and compressors series TRH - TRS - TRM - TRV - SA & Systems type HYDROSYS - OILSYS
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Find the minimum and maximum width of the coupling, the difference between these two readings "Y" (Y1-Y2)
should no exceed the value listed in tab. 6 for the given coupling size. Should this value be greater it will be
necessary to correct the alignment by shimming the pump and/or motor.
Following this operation it is recommended to check once more the value "X" to make sure that both values are
within the allowed tolerance (see point 9). Make sure that both set screws on the coupling halves are properly
secured.
Tab. 6
COUPLING
“Ø A” mm
GAP
“S” mm
PARALLEL
"X" mm
ANGULAR
"Y" mm
60 ÷ 80
2 ÷ 2,5
0,10
0,20
100 ÷ 130
0,15
0,25
150 ÷ 260
3 ÷ 3,5
0,30
290
4 ÷ 5
0,30
330
5 ÷ 7
11 - Install the coupling guard and its extension (if applicable) on the pump, secure the two locking bolts.
The gap between motor frame and the guard should not be greater than 2 to 3 mm (see fig. 28).
2 ÷ 3 mm
Fig. 28
9 - ELECTRICAL CONNECTIONS
DANGER!
Electric danger. Electrical connections must be made exclusively by qualified personnel in accordance with
the instructions from the manufacturer of the motor or other electrical components and must adhere to the
local National Electrical Code. Always ground the motor verifying it is properly wired.
When the pump is
coupled on baseframe carry out the ground connection also for the baseframe on the preposed position with
screw or through hole marked by the ground connection symbol.
Remove a portion of the paint on the connection point to ensure electrical continuity between the base and the
earthing cable It is advisable to have an electrical switch near the pump for emergency situations.
FOLLOW ALL SAFETY PRECAUTIONS AS LISTED IN CHAPTER 2.
BEFORE DOING ANY WORK TO THE INSTALLATION DISCONNECT ALL POWER SUPPLIES
All electric motors and possible connected accessories must be protected against overloading by means of
circuit breakers and/or fuses. Circuit breakers and fuses must be sized in accordance with the full load
amperage appearing on the motor nameplate.
It is recommended that motors over 5.5 kW be wired for Star-Delta start-up, to avoid electrical overloads to the
motor and mechanical overloads to the pump.
It is advisable to have an electrical switch near the pump for emergency situations.
Be sure to replace all safety guards before switching on the electrical power.
Prior to connecting the electrical wiring, turn the pump shaft by hand to make sure that it rotates freely.
Connect the electrical wiring in accordance with local electrical codes and be sure to ground the motor.
Motor connection should be as indicated on the motor tag (frequency and voltage) and as discussed in the motor
instruction manual.
If possible check the direction of rotation before the motor is coupled to the pump but protect the motor shaft to prevent
any accidents. When this is not possible briefly jog the pump to check its direction of rotation(see arrow on pump for
correct rotation). If the direction must be changed 2 of the 3 electrical wire leads must be alternated with each other (at
the terminal box or at the motor starter).
Please be aware that rotation in the wrong direction and/or pump running dry may cause severe pump damage.
Electrical instrumentation such as solenoid valves, level switches, temperature switches, etc. which are supplied with
the pump or systems must be connected and handled in accordance with the instructions supplied by their respective
manufacturers.
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