Description
26
130001398_002_C0 - 09/2016 - © Leybold
Remarks
Cycle times exceeding 40 minutes are considered as continuous operation.
Short cycle operation below 2 minutes must only be implemented using a
WHU pump; in the case of longer pumpdown times we recommend a WH
pump in combination with a frequency converter.
For precise determination of the starting differential pressure in connection
with frequency converter operation please consult us.
Do not allow the WHU pumps to operate for longer periods of time at high
pressures. The bypass line has been optimised for rapid pumpdowns and
has not been designed to protect the pump at higher pressures!
NOTICE
Maximum permissible differential pressures for the RUVAC WH in mbar
WH 2500
Operation at
50 Hz
60 Hz
80 Hz
100 Hz
Pump ratio
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
Continuous operation
75/55* 60/55*
50
60/55* 50/55* 40/50*
40
35
30
20
20
20
Duty cycle 50%
75/55* 75/55* 70/55* 75/55* 70/55*
55
55
45
40
25
25
25
Pumpdown from atmosphere
(< 2 min) WHU
90
90
–
90
90
–
–
–
–
–
–
–
* Operation without frequency converter / with Leybold frequency converter
WH 4400
Operation at
50 Hz
60 Hz
80 Hz
Pump ratio
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
Continuous operation
45
38
30
30
25
20
12
10
8
Duty cycle 50%
75
63
50
57
47
38
18
15
12
Pumpdown from atmosphere
(< 2 min) WHU
90
90
–
90
90
–
–
–
–
WH 7000
Operation at
50 Hz
60 Hz
70 Hz
Pump ratio
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
1:1 -
1:4
1:5 -
1:8
1:9 -
1:15
Continuous operation
30
25
20
21
17
14
14
12
11
Duty cycle 50%
45
37
30
31
25
21
21
18
16
Pumpdown from atmosphere
(< 2 min) WHU
70
70
–
70
70
–
–
–
–
