13
➡
Set the applicable gas mode on the TC 600 via the DCU
(please refer to Operating Instructions ”Pumping
operations with The DCU” PM 800 547 BN).
Works setting: Gas mode 0
Pumping gases with molecular mass
≥
40 with
the incorrect gas mode can cause damage to
the pump.
For the vertex of the power characteristic line please refer to
Section 9. Technical Data.
Maximum power is applied when the pump starts in order to
limit the time required. Once the set rotation speed is
attained, switching to the selected power characteristic line
is automatic.
If the gas dependent maximum power is exceeded, the rotati-
on speed is reduced until equilibrium between the
permissible power and gas friction is attained. The power
limitation serves to protect the pump against thermal over-
loading. In order to avoid rotation speed fluctuations it is
recommended to set, in rotation speed setting mode, the
equilibrium frequency or a somewhat lower frequency.
Owing to the limited drive power on the TC 100,
there is no difference between the two ”gas
modes” settings on these pumps.
☞
PLEASE NOTE
Switch Outputs
(Pin 8/X3 And Pin 9/X3)
The switch outputs 1 and 2 can be loaded with maximum
24V/50 mA per output. The following functions are assigned to
the switch outputs:
Switch output 1:
Active high after attainment of the
rotation speed switchpoint. The
switchpoint for the turbopump is set
at 80% of the nominal rotation speed.
It can be used, for example, for a signal
"Pumpe betriebsbereit" ("pump ready to
operate").
Switch output 2:
Active low on collective error signal.
The connection of a relay is made between Pin 15 (mass) and
the respective switch output Pin 8 or Pin 9 (please refer to
Section 3.13. Connections Diagram).
Accessory Outputs
(10/X3 and Pin 11/X3)
The accessory outputs can be loaded with a maximum of
24 V/200 mA.
The works setting on the accessory outputs are:
Accessory output 1:
A connected air cooling system is started.
Accessory output 2:
A connected venting valve is started if venting release has
been transmitted via accessory input 2.
Other components can be connected with the respective sel-
ection via the DCU or the RS 485.
Analog Output
(Pin 12/X3)
A rotation speed proportional voltage
(0 - 10 VDC correspond to 0 - 100%*fend) can be tapped via
the analog output (load
≥
10 k
Ω
).
Additional functions (power, current) can be assigned to the
analog output via a DCU or Serial Interface RS 485.
4.4. Gas Type Dependent Operations
Where high level gas loads and rotation speeds are involved,
the resulting friction subjects the rotor to the effect of great
heat. To avoid over-heating, a power rotation speed charac-
teristic line is implemented in the TC 600; this ensures that
where maximum gas loads are involved, the pump will opera-
te at any rotation speed without the danger of damage
arising.
The maximum power is dependent on the type of gas. Two
characteristic lines are available for any type of gas in order
to fully exploit the power potential of the pump:
– "Gas-Mode 0" for gases with molecular mass
≥
40 as, for
example, Argon;
– "Gas-Mode 1" for all lighter gases.
Power
Frequency
D
B
C
A
D-C = Gas mode «0»
B-A = Gas mode «1»
Run up
fnom
Kennlinie Gasarten
4.5. Switching OFF And Venting
Before coming to rest after switching off, the turbopump must
be vented in order to prevent contamination.
➡
Switch off the power unit with switch S1.
➡
Open the venting screw (on delivery, screwed in) on the
venting connection slowly about one turn.
➡
Where water cooling is involved shut off the supply of
water.
Switching off the turbopump via remote cotrol, please refer to
Section 4.3..
