LAMAR BETA D-50 Operating Manual - page 28
5. CALIBRATION AND MAINTENANCE
5.5 MAINTENANCE
Standard electrical equipment maintenance and cleaning procedures should be
followed.
5.5.1 VENTS AND FAN
Regularly check that the rear fan vents are clean to ensure adequate cooling of the unit.
This is especially important when the unit is placed in a dusty or otherwise dirty air
environment.
5.5.2 DC BATTERY CABLE AND LEADS
Inspect DC battery cable and connector periodically. Replace damaged or worn cable.
WARNING:
Disconnect AC voltage and battery before
attempting to replace or secure cable
The DC cable contains 4 leads. Two are heavy-gauge DC current leads for the battery
discharge current. Two are light-gauge leads for sensing the battery voltage. Each current
carrying lead has its sensing lead attached at the battery quick disconnect.
To replace DC battery cable proceed as follows:
1) Disconnect AC line and battery
2) Remove unit cover
3) Replace old cable from connector and unit
4) Make sure that each sensing lead is securely soldered or crimped
to the termination of the DC cable at the connector and at the
internal termination
5) Check all leads for tightness
5.5.3 REPLACEMENT OF FUSES
The Beta D-50 is equipped with two fuses. One 3 ampere AC line fuse and one 70
ampere DC line fuse. See specification in section 7 for the specific types of
fuses required.
WARNING:
Disconnect AC voltage and battery
before attempting to replace any fuses.
To replace the AC line fuse unscrew the fuse cover on the rear of
the unit and exchange the old fuse (see picture).
To replace the DC line fuse remove the unit cover. Remove the
old fuse located on either the base or the side of the unit. Replace
with the new fuse.
5.5.4 CLEANING AGENTS
Do not use acetone and other similar cleaning agents on the meters, timer or any
plastic part.
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BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2