Micro
ARE-M Series 24V Chargers, Single Phase
Maintenance
PM990-1070-24, Issue 12
6-6
CHECKING COMPONENTS
6.4
This section describes methods that can be employed to determine whether a component has failed. A failed
component must be replaced with a UNIPOWER approved part. See Table 6-2 Parts List, for component
descriptions and UNIPOWER part numbers.
CAUTION
Do Not
press this button if either circuit breaker is
On
ATTENTION
Ne pas
appuyer sur ce bouton si les disjoncteurs sont
ouverts.
Before performing any of the following tests:
1.
Disconnect both the AC power and battery power by switching both circuit breakers
off
. Note that
battery power will still be supplied to CB2, the DC circuit breaker, and to the Control and Display
board and Interface board.
2.
Press the Capacitor Discharge button located behind the front panel (door) to discharge filter and
resonant capacitors, if required. See Figure 6-1 for a typical location of the button.
CAUTION
– For Service Only: AC and DC breakers
must be open before pressing button.
ATTENTION
- Pour l’entretien seulement: Les
disjoncteurs AC et DC doivent être ouverts avant
d’appuyer sur le bouton.
FIGURE 6-1 Capacitor Discharge Button
Diodes
- First, remove at least one connection to the diode, and then check using an analog ohmmeter to
measure resistance, first cathode to anode and then anode to cathode. A good diode will show low resistance
one direction and very high resistance the other direction. A shorted diode will show no or very low resistance
both ways. An open diode will show a very high resistance both ways. Suggested scales for these checks are
either X10 or X100.
Alternatively, a digital meter with a “diode check” function can be used to test a diode.
Capacitor Discharge:
Press button for 60
seconds.
See the Cabinet
Assembly drawings
for button location in
other models.
