MKS 651C, Инструкция по эксплуатации, Страница: 115 / 172

Chapter Eight: Valve Failsafe Battery Back-up
Option General Information
101
Chapter Eight: Valve Failsafe Battery Back-up Option
General Information
An optional Valve Failsafe Battery Back-up (lead-acid battery) provides full valve drive
capability for approximately 30 seconds after an AC power failure. The 651 instrument can be
set to drive the valve open, closed, or hold it in its current position upon a power loss. This
battery is a rechargeable, 12 Volt, 2 amp-hour, sealed lead-acid battery (MKS part no.
003-1109451).
Note
The lead-acid battery is also available from the following sources:
•
Power Sonics (PS-1220)
•
Panasonic (LCR 12 V2.2P)
This chapter provides instructions on how to check your controller to ensure that it recognizes
when the battery back-up module is present, and how to configure the valve position upon a
power loss when using either Local or Remote operation.
If a Valve Failsafe Battery Backup is installed, an
ATTENTION
label is affixed to the side of the
651 unit. The label states that the unit contains a lead-acid battery which is maintained in a
properly charged state while the instrument is powered on. Basic maintenance information is
also provided. Since the lead-acid battery is continually recharged while the 651 unit is powered
and operating, the battery is typically maintenance free and needs attention only when it must be
replaced. The upper limit of the ambient temperature range of a 651 unit, equipped with a Valve
Failsafe Battery Back-up option is 35° C versus 40° C for a unit without the option.
Note
If a Valve Failsafe battery backup is ordered for a 651A or 651B unit, the
unit must be sent back to your local MKS Service Center to have the
battery backup system installed. Before returning the instrument to
MKS, obtain an ERA Number (Equipment Return Authorization
Number) from an MKS Service Center.