
Instruction Manual PMU-27V155WL□A
1. Safety Instructions
• MustselectcorrectACinputvoltage rangethroughselectable switchbeforeturning on(Referto
Fig.1,⑥).
• To ensure sufcient convection cooling, always maintain a safety distance of ≥ 20mm from all
ventilatedsurfaceswhilethedeviceisinoperation.
• Forsafetyreasons,pleaseensurethemounteddeviceiskeptat≥7mmsafetydistanceatthetop
andleftsidefromothercomponentsandequipments(RefertoFig.2).
• The device is not recommended to be placed on low thermal conductive surface, for example,
plastics.
• Notethattheenclosureofthedevicecanbecomeveryhotdependingontheambienttemperature
andloadofthepowersupply.Donottouchthedevicewhileitisinoperationorimmediatelyafter
poweristurnedOFF.Riskofburning!
• Donottouchtheterminalswhilepowerisbeingsupplied.Riskofelectricshock.
• Preventanyforeignmetal,particlesorconductorstoenterthedevicethroughtheopeningsduring
installation.Itcancause:Electricshock;SafetyHazard;Fire;Productfailure
• Batteryneedtobeprotectedfromshortcircuitwhileinstallation&servicing.Dangerofexplosion.
• SignalcableshouldnotinteractwithACInput.
• Warning:Whenconnectingthedevice,secureEarthconnectionbeforeconnectingLandN.When
disconnectingthedevice,removeLandNconnectionsbeforeremovingtheEarthconnection.
2. Device Descriptions
RefertoFig.1.:
䐟Input&Outputterminalblockconnector
䐠DCvoltageadjustmentpotentiometer(24V-28V)
䐡Green LED ON = DC OK (Normal operation through mains supply or through battery when
operatinginbufferingmode)
մRedLEDON=Batteryreversepolarity
յBatterychargingcurrentadjustmentpotentiometer(FactorySetting:1A)
Max charging current shall not exceed 1.2A (Refer to Fig. 1, ⑤).
նACselectableswitch
䷻Signalconnector-JST:XHP-4(forPMU-27V155WLCAonly)
3. Installation of the Device
RefertoFig.3.:
䑵Mountingholesforthepowersupplyassemblyontothemountingsurface.Thepowersupplyshall
bemountedonminimum2mountingholesusingM3screwminimum5mmlength.
䑶Thissurfacebelongstocustomer’sendsystemorpanelwherethedeviceismounted.
䑷Connector
• Useexiblecable(strandedorsolid),AWGNo.16-14.
• ThetorqueattheConnectorshallnotexceed13Kgf.cm.Theinsulationstrippinglengthshouldnot
exceed0.275”or7mm(RefertoFig.4).
4. Battery Information
Battery Capacity 3.2AH-15AH
Battery Cut-off Voltage 20V±1V
Battery Low (Deep Discharge) Detection* 17V±1V
*Ifthebatteryisdeepdischarged,thepowersupplywillnotrecognizethebattery.
5. Installation of Mounting Accessories
RefertoFig.5.:
• OnlyuseM3screw≤2.5mmthroughthebasemountingholes.Thisistokeepasafetydistance
betweenthescrewandinternalcomponents.
• Recommendedmountingtighteningtorque:4~8Kgf.cm.
www.DeltaPSU.comREV.00
Fig. 1. Device Descriptions
Fig. 4. Wire Type Fig. 5. Mounting Screw
Lug Stripped wire
Mounting
accessories
Mounting
screw
Chassis of
the device
2.5mm
max.
7 mm
Side Mounting (Vertical) Base Mounting (Vertical) Side Mounting (Horizontal)
A
B
C
A
C
B
A
B
C
Fig. 3. Mounting Orientation
Base surface
Side surface
127
3
5
4
6
Fig. 2. Assembly Reference
≥ 7mm
CN1
PSU
CN1
≥ 7mm
PSU
TOP SIDE
LEFT SIDE
LEFT
TOP
Signalconnector-JST:XHP-4
(forPMU-27V155WLCAonly)
7
Pin No.
1
2
3
4
DCOK
LowBattery
GND
ACOK
Description
400mm.(Ref.)