Figure 4-3 Mbd-S/Mbd-T Power Supply Circuit - Ulvac MBD Series Instruction Manual

CRYO METER MBD series Instruction Manual
◆Power connection and protection
Figure 4-3 is a MBD-S/MBD-T power supply examples and its connection.
It is recommended to calculate the capacities of the step-down transformer and of branch
circuit protector/fuse by formulas below.
(*1) Step-down transformer: Number of MBDs x 15 x 3 [VA]
(*2) Branch circuit protector/fuse: Number of MBDs x 0.15 x 4 [A]
For example, when using four MBDs, the capacity of the step-down transformer can be
calculated as 180[VA] by the formula, 4 x 15 x 3. Also the capacity of a protector/fuse should
be more than 2.4[A], 4 x 0.15 x 4. Thus, it is appropriate to choose a trans that capacity of
200VA and a protector/fuse of 3A.
(Note: MBD-S and MBD-T need less consumption current compared to that of existing MBD.)
When 200V power supply is used, such as MBD-T, the power line surge will be larger. It is
recommended to install varistor near the terminal block.
(*3) Recommended varistor type: ERZV10D471 Matsushita
User's power line
for Cryopump
R1
S1
PE
R1
S1
(The wirings shown on the left side of the dotted line
need to be done by customers)
VA
(*1)
Protector or
Trans
a fuse
220V 115V
200V
100V
0VI 0V
(*2)
(Use jumper with
MBD-S power supply
EN60204-1)
Protector or
a fuse
Varistor
(*3)
A
(*2)
Terminal block for
MBD-T power supply
Figure 4-3 MBD-S/MBD-T Power Supply Circuit
ULVAC CRYOGENICS INCORP RATED
N
N
(Plug: PSE 7A/125V)
A
AC out let for
MBD Power cable
L
(White)
N
E
(Green/Yellow)
O
MBD-S
MBD-T
7