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STP-H600/H1000 Series Instruction Manual
9 Internal Battery
Four batteries (PORTALAC Series Small-Sized Sealed Lead-Acid Batteries, PE12V 2WS :
12V, 2Ah, manufactured by Japan Storage Battery Co., Ltd.) (hereinafter referred to as the
internal battery) are inserted into the STP pump for backup during a power failure. These
are rechargeable. During a power failure, power is supplied from the batteries, and
levitation by a magnetic bearing continues for 6 minutes while the pump is decelerating and
the rotor is landing.
Fully-charged batteries are capable of consecutively backing up the operation of the STP
pump twice.
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Do not use unspecified battery.
If you use unspecified battery, contact Seiko Seiki before use.
9.1 Life of the Internal Battery
The life of the internal battery is affected by ambient temperatures.
Pay attention to ambient temperatures (the operating ambient temperatures range from 0 to
40 °C).
Figure 9.1 shows the relationship between the ambient temperatures and the battery life.
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Replace the battery approx. once a year to make sure it is always ready to back
up the operation of the STP pump.
For instructions on how to replace the battery, see Section 9.5, "How to Replace
the Internal Battery."
9.2 Allowable Shelf Life of the Internal Battery
When the internal battery is left uncharged, its capacity will be reduced by self-discharge.
The allowable shell life of the internal battery is affected by ambient temperatures. Pay
attention to its storage temperatures (the storage temperatures range from - 20 to + 40 °C).
Figure 9.2 shows the relationship between storage temperatures and the allowable shelf life
of the internal battery.
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When the STP pump is left unused over the specified period, charge the internal
battery for 90 minutes or more, or replace it with a new one before starting the
STP pump. For instructions on how to recharge the internal battery, see
Section 9.3, "How to Charge the Internal Battery." For instructions on how to
replace the internal battery, See Section 9.5, "How to Replace the Internal
Battery."
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