4
5.8
Electric connections
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Connection of the power supply cables of the drive
motor must be effected by an electrical expert accord-
ing to the switching diagram of the motor manufacturer.
For these purposes, the current VDE regulations and the
regulations of the local energy supply association are to
be observed.
Danger by electrical energy must be excluded.
6.
Starting/stopping
6.1
Preparation for starting
6.1.1
Filling the tanks with liquid
B
Do not allow the pump to run when dry!
Even a few revolutions without liquid
can damage the stator. For this reason, the minimum
covering shown in the tables of dimensions must be
observed.
6.1.2
Switching in the additional facilities for shaft seals (if
provided)
If the pumps are charged with a sealing/quench liquid,
the stop valves, prior to initial start-up of the pump, must
be opened and set to the pressures listed below.
– Supply of the stuffing box with flushing or sealing
liquid
(Designs P02, P12, P03, P13, P04 and P14).
Note:
For maintaining their function, stuffing boxes
with flushing or lantern rings require a flushing/seal-
ing liquid.
The required flushing and/or sealing liquid pressure
in case of pumps with stuffing box is for stuffing box
designs
P02/P12 = 0.1 up to 0.5 bar (above internal
discharge casing pressure)
P03/P13 = 0.5 bar (above internal
discharge casing pressure)
P04/P14 = 0 up to 0.5 bar
(For flushing and sealing liquid, please refer to Sec-
tion 6.1.3 below).
– Supply of the single-acting, non-balanced mecha-
nical seal with throttled sealing liquid outlet
(Designs G04 ... G07)
Note:
For maintaining their function, these mechani-
cal seals require a flushing liquid which dissipates the
generated frictional heat and limits the penetration
of the liquid to be pumped into the sealing chamber.
The required flushing liquid pressure is 0.1 up to 0.5
bar above the internal discharge casing pressure (for
flushing liquid, please refer to Section 6.1.3 below).
– Supply of the double-acting non-balanced mechani-
cal seal
(Designs G08, G09)
Note:
For maintaining their function, these mechani-
cal seals require a sealing liquid which serves to dis-
sipate the generated frictional heat and to avoid
penetration of the liquid to be pumped into the seal-
ing gap.
B
Prior to each start-up, the circulation
of the sealing liquid must be ensu-
red. The sealing liquid pressure must be approx. 1.5
to 2 bar above the pressure in the discharge casing.
The flow rate must be regulated so that the outlet
temperature of approx. 60
h
C is not exceeded and is
at least 30 K below the boiling temperature at opera-
ting pressure (for sealing liquid, please refer to Sec-
tion 6.1.3 below).
6.1.3
Quality and properties of the flushing/sealing liquid
B
Any liquid may be used as sealing/
flushing liquid in consideration of the
corrosion resistance of all contacted parts and the
consistency with the medium to be sealed. The liquid
must be free from solids, must not tend to sedimentati-
ons, should have the highest possible boiling point as
well as a good heat conductivity and low viscosity. Clean
water of low hardness meets these demands to a high
degree.
6.1.4
Switching in the additional facility for heating or cool-
ing the shaft sealing housing (double shell housing)
If the pumps are equipped with this additional facility,
any and all stopping devices for heating or cooling
systems must be opened. The below-mentioned pres-
sure and temperature limits must be observed.
– Supply of the cooled or heated shaft sealing hous-
ing (double shell housing) with appropriate liquid
medium
!
Only liquid media
may be used as heating or cooling
liquid in consideration of the corrosion resistance of
all contacted parts.
The maximum heating or cooling liquid pressure is
10 bar.
The maximum heating temperature must not exceed
180
h
C, and the cooling temperature not fall below
– 40
h
C.
Note:
For the design temperature, please refer to the
order data sheet.
6.1.5
Break-away of the pump
When starting up for the first time or after a longer shut-
down period, make sure that the pump can be easily tur-
ned by the drive motor. If this is not readily possible, e.g.
due to a high degree of adhesion between the rotor and
stator when brand new, movement can be assisted by
using a suitable tool in the key area of the drive shaft
and/or at the hollow shaft behind the shaft seal.
B
When doing so, the drive/hollow shaft
must not be damaged.
6.1.6
Control of the sense of rotation
The sense of pump rotation is clockwise, looking from
the drive towards the drive shaft.
B
The sense of pump rotation must corre-
spond to the directional marker „n“ in
the pump name plate. Wrong sense of rotation may
result in damages to the pump. For a control of the
sense of rotation, the motor on/off switch is to be tou-
ched only briefly.
6.2
Starting
6.2.1
Start-up
All shut-off elements on the discharge side must be
opened before starting up.
6.2.2
Drive
Switch motor in.
B
Consider product-specific particulari-
ties of the drive.
Please refer to the
operating instructions of the drive manufacturer.
6.2.3
Checking the delivery values
After the drive has reached its operating speed, the
pump outlet pressure must be checked via the pressure
gauge.
The motor must not be overloaded. The power con-
sumption can be checked by means of an ammeter. In
this connection, temperature and viscosity of the liquid
to be handled must be checked. The values read must
be checked against the order data sheet and/or accep-
tance report.
Series SLTP, SETP, SNTP, SLTBP, SETBP, SNTBP
ALLWEILER
a
