SPX Cooling Technologies TG MAG15-50 Combustion engines, 3.18.7.6Shaft coupling, Circuit breaker

Circuit breaker

For safety work on a pump unit, install a circuit breaker as close as possible to the machine. It also is advisable to place an earth fault circuit breaker. The switching equipment must comply with prevailing regulations, as stipulated by EN 60204-1.

Motor overload protection

To protect the motor against overloads and short-circuits a thermal or thermo-magnetic circuit breaker must be incorporated. Adjust the switch for the nominal current absorbed by the motor.

Connection

•Do not use a star-delta circuit with electric motors due to the required high starting torque.

•For single-phase alternating current, use motors with a “reinforced” starting torque.

•Ensure a sufficiently high starting torque for frequency-controlled motors and adequate cooling of the motor at low speeds. If necessary, install a motor with forced ventilation.

Electrical equipment, terminals and com- ponents of control systems may still carry live current when at rest. Contact with these may be fatal, result in serious injury or

L1

L2

U

L1

L2

U

cause irreparable material damage.

Line	Motor
U (volt)	230/400 V	400 V
3 x 230 V	delta	–
3 x 400 V	star	delta

L3

N

L3

N

3.18.7.5 Combustion engines

When using a combustion engine in the pump unit, see the engine instruction manual included in the delivery. Contact the pump supplier if the manual is not included.

Irrespective of this manual the following must be respected for all combustion engines:

delta

U1

V1 W1

W2 U2 V2

star

U1 V1 W1

W2 U2 V2

•Compliance with local safety regulations

•The exhaust of combustion gases must be screened to avoid contact

•The starter must be uncoupled automatically once the engine has started

•The pre-set maximum number of engine revolutions may not be modified

•Before starting the engine, the oil level must be checked

Note!

•Never run the engine in a closed area

•Never refuel the engine while it is still running

3.18.7.6Shaft coupling

Internal gear pumps demand a relatively high starting torque. During the operation shock loads occur due to pulsations inherent to the gear pump principle. Therefore, choose a coupling which

is 1.5 times the torque recommended for normal constant load.

Fit – without impact tool – both halves of the coupling to the pump shaft and the motor shaft respectively.

Alignment

The pump and motor shafts of complete units are accurately pre-aligned in the factory. After installation of the pump unit, the pump and motor shaft alignment must be checked and re-aligned if necessary.

Alignment of the coupling halves may only take place by moving the electric motor!

36 A.0500.551 – IM-TGMAG/02.00 EN (02/2008)