How to Select Uninterrupt. Power Supply for Machine Protect. Funct. in Power Failure (A-53867E-1428) Additional Manual Page 1

Additional Manual
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FANUC LTD
DESCRIPTIONDESIGNDATE
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How to select Uninterruptible Power
Supply (UPS) for Machine Protection
Function in Power Failure
A-53867E-1428
Newly designedHANYU
1998.08.24
01
How to select Uninterruptible Power Supply (UPS)
for Machine Protection Function in Power Failure
In case of using the Machine Protection Function in Power Failure, the small-sized uninterruptible power
supply (UPS) must be connected to supply the energy for the control circuit in CNC and PSM when the power
failure occurs. How to select UPS is described as follows.
(1) Output capacity
Output capacity of UPS is more than the sum of the capacity of the equipment connected to UPS.
Only the equipment that is needed for the backup in the power failure should be connected to UPS so that
the capacity of UPS is cut down. The equipment needed for the backup in the power failure is CNC, PSM,
sequencers, control relays, and so on. The equipment not needed for the backup in the power failure is
lamps, coolant pumps, fan motors, and so on.
How to calculate the power capacity of the equipment is described as follows.
1) CNC
In case of AC200V input type: Use the power equipment capacity (VA) mentioned in the descriptions.
In case of DC24V input type: Use the following expression.
Power Equipment Capacity[VA] = 24[V] × I [A] ÷η ÷ cosφ
I : Current capacity [A] mentioned in the descriptions.
η: Efficiency of power supply (normally about 0.85) .
cosφ: Power factor (normally about 0.5) .
2) PSM: 700 [VA]
3) Sequencer and so on.
In case that the Power[W] is obtained:
Power Equipment Capacity[VA] = Power[W] ÷ 0.5
In case that the Current[A] is obtained:
Power Equipment Capacity[VA] = Current[A] × Input voltage (100V or 200V)
(2) Power holding time in the power failure.
The action of the machine protection is generally finished in a few seconds. Select the UPS which can be
kept supplying the power during the action of the machine protection.

Contents Summary of How to Select Uninterrupt. Power Supply for Machine Protect. Funct. in Power Failure (A-53867E-1428) Additional Manual

  • Page 1How to select Uninterruptible Power Supply (UPS) for Machine Protection Function in Power Failure In case of using the Machine Protection Function in Power Failure, the small-sized uninterruptible power supply (UPS) must be connected to supply the energy for the control circuit in CNC and PSM when t
  • Page 2(3) Output voltage and Input voltage There are AC100V type UPS and AC200V type UPS at the specification of the input and the output voltage. In case of using the AC100V type UPS, two transformers (AC200V to AC100V and AC100V to AC200V) should be connected to the input and the output of UPS. In case