Edwards SCU-1601

SCU-1601 Control Unit for Turbomolecular Pump
MT-96E-1B1-0
Page 116
5
SERIAL COMMUNICATION PROTOCOL
5.4.16.1 Second speed function setting
Settings for second speed can be changed.
CAUTION
There is an endurance limit of setting changes (no more than 24 times per day for about ten years).
If this limit is exceeded, it not only may become impossible to change the setting but can also cause
pump failure. Do not make setting changes in excess of this endurance limit.
Parameter
Item
Data format
Remark
1
Optional function
number
16-bits hexadecimal
coded ASCII
0014
hex
2
Second speed setting
(Unit: Hz)
16-bits hexadecimal
coded ASCII
*1
3
Second speed option
setting
16-bits hexadecimal
coded ASCII
0000
hex
：DISABLE
00FF
hex
：ENABLE
(parallel port operation)
01FE
hex
：ENABLE
(serial port operation)
Others are refused
*1 This value can be changed in the range from half of the rated rotational speed to the rated rotational speed. When the
parameter value is larger than the rated rotational speed, it is automatically set to the rated rotational speed. When the
parameter value is smaller than half of rated rotational speed, it is automatically set to half of rated rotational speed. The
value of "Speed Set Point" displayed in LCD of SCU-1601 is in increments of 500 rpm.
Example:
Second speed setting
: 00E1
hex
= 225 Hz = 13500 rpm
Second speed option setting
: 0000
hex
= DISABLE
Parameter
1
2
3
ASCII
0
0
1
4
0
0
E
1
0
0
0
0
HEX
30
30
31
34
30
30
45
31
30
30
30
30