User`s manual

Directions for use
7-3
7
(2) Calculation of current consumption (by current consumption mark).
Add up the total numbers of the current consumption mark on stickers next to the model name label.
One mark of current consumption means approx.100 mA.
Constitute a system in order to follow the below conditions:
The total marked current consumption must be less than 35 for modules that supply power
when using a JW-21PU/22PU/31PU, and less than 45 when using a JW-33PU.
The example below is calculated on the conditions that 10 JW-32CUM1 control modules
(basic rack panel: JW-34KBM), 2 support tools, 6 I/O bus expansion adapters JW-31EA, and
5 JW-32EA are used.
[Example] Calculation of the total current consumption in the system configuration below:
Power supply module: JW-21PU
Control module (basic rack panel): JW-32CUM1 (JW-34KBM)
Hand-held programmer: JW-14PG
100/120 VAC input module: JW-201N 8 sets
JW-211NA 8 sets
100/240 VAC output module: JW-203S 8 sets
JW-212SA 8 sets
No. of marks
JW-32CUM1
JW-34KBM ........................... 12
JW-14PG
JW-201N................................. 8
JW-211NA .............................. 8
JW-203S ............................... 16
JW-212SA .............................. 8
Total 52
The total marked current consumption equals 52. Since this exceeds 35, which is the limit when using
JW-21PU, another power supply module is required in order to install these modules on the expansion
rack panel.
(3) Calculation of current consumption (by calculating current consumption)
As the calculation example, calculate current consumption taking the system configuration in the
example of (2).
JW-32CUM1 (JW-34KBM)... 0.95 A
JW-14PG ............................... 0.2 A
JW-201N ............. 0.04 x 8 = 0.32 A
JW-211NA .......... 0.06 x 8 = 0.48 A
JW-203S ............. 0.13 x 8 = 1.04 A
JW-212SA........... 0.06 x 8 = 0.48 A
Total 3.47 A
The total current consumption is 3.47A. This value is less than the output current of 3.5 A from the JW-
21PU. Therefore, there is no need to install power supply module in an expansion rack panel.
As indicated above, the total current consumption calculation method requires no more power supply
module, but the current consumption mark method requires another power supply module. Therefore,
get total current consumption using calculation method for determine system configuration. The mark
counting method gives only a rough estimate.