Flowserve PLEUGER Bedienungsanleitung PDF herunterladen (Seite 17)

PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13

Page 17 of 40 flowserve.com

5.3 Motor protection

To protect the motor against current overload, a

thermal overload relay must be provided. The

tripping time of the relay should have temperature

compensation to allow for variations in ambient

temperature. It should also have accelerated tripping

under single-phase conditions.

Trip reset should only be possible manually.

The setting of the thermal overload relay must be

chosen according to the data sheet provided with the

pump.

For star-delta motor starters, it is important that the

protection relay is in the motor line (see figure 5-3 or

5-9). The adjusted current level will then be 58 % of

the operational current. If the protection relay has

been installed in the power line in exception to this

rule, the adjusted current is the same as the

operational current.

Table 5-1; Overload relay tripping characteristic

100 mm (4 in.)

150 mm (6 in.) or larger

1.05 x I

> 2 hours

cold

1.,20 x I

< 2 hours

warm

5 x I

6 x I

10seconds

cold

= Release current

= operational current (rated current)

t = Delay time until release

L = Operational temperature before overload

The adjustment of the motor protection relay

(thermally delayed over current release) must be set

according to the value given in the data sheet.

The value given in the data sheet is a standard value

for the operating point. If the actual operational

current in the operating point of the pump is less than

this given value, the motor protection must be

adjusted lower so that there is effective protection

and malfunctions can be indicated in time.

The motor protection adjustment must

never be set higher than the highest permissible

value given in the data sheet. Testing the correct

operation of a motor protection switch by deliberate

single phasing is not permitted!

5.4 Short circuit protection

To prevent a short circuit in the power cable and the

motor, safety precautions must be taken according to

local regulations.

Guide values for safety fuse sizes can be found in the

data sheet.

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