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IV) Operation
A) AC Input
The PM will operate on either 115 or 230 VAC (+15% to -25%) input at 50-
60 Hz. Input voltage selection is explained in the INSTALLATION section.
No adjustment is required for 50 or 60 Hz. operation.
AC input is protected against over-current and internal short circuit condi-
tions by the circuit breaker/input power switch on the front panel. When this
switch is in the on position and DC is available at the output terminal, the
"ON" indicator L.E.D. on the left side of the front panel will illuminate.
B) DC Output
The PM produces 12, 24 or 48 VDC nominal output, depending on model.
The ground reference may be positive, negative or floating.
Regulation: Regulation at the "V OUT" output terminal is within ± 2 % of
rated voltage, under all line and load conditions. Regulation at the "V2"
terminal is ± 1 %. Ripple is within ± 1 % of rated voltage with or without
batteries on-line.
Output Voltage Adjust: Factory-set voltages (as measured at the V OUT
terminal) and approximate adjustment ranges are specified below. Adjust-
ment is made at the "OUTPUT VOLTAGE ADJUST" pot on the left side
of the front panel using a small flat tip screwdriver (see Figure 1). Output
voltage test points for both the "V OUT" and "V2" outputs are provided
beside the voltage adjust pot for ease of monitoring while making this
adjustment. Use of a digital multimeter is recommended when making this
adjustment. If the PM has had the charger function board installed, output
voltage adjustments are automatic and this adjustment pot is disabled.
Model PM-12-45 includes factory installed Charger Function Board (CFB)
and Temperature Compensation Sensor (TCS), so output voltage is pre-
programmed for Lead-Acid batteries. See CFB manual info regarding
output voltage settings (Gel-Cell).
Output Voltage Table
Factory Set "V OUT" "V OUT"
Model
Output Voltage
PM-12-40, PM-12-70
13.6V DC
PM-24-20, PM-24-35
27.2V DC
PM-48-18, PM-48-10
54.4V DC
PM-12-45
13.4V DC
Current Limit Circuit:
The PM is rated for continuous duty at the current
level indicated by model number, e.g., PM-12-40 is rated at 40 amps con-
tinuous duty. To prevent overload when recharging severely discharged
batteries, current is limited at approximately 105 % of the continuous duty
rating by a current fold-back circuit.
7
P.O. Box 1306, Newport Beach, California 92663 • Phone: 714-751-0488 • Fax: 714-957-1621 • E-Mail: techservice@newmarpower.com
current limiting circuit of the PM should prevent these fuses from blowing
under normal operating conditions. If the d.c fuse(s) blow, this may indicate
a reverse polarity hook-up or an internal short.
fuse, the cover must be removed. The DC fuse is either an HBO type or an
ATC blade type (depending on model) mounted on the main PCB. Be sure
to replace with the same type and value as indicated on the fuse.
the fuse should blow to protect DC wiring. However damage to internal
components may also have occurred. If the replacement fuse blows, return
the PM to the factory for a thorough inspection.
operation at full rating, the PM employs automatic cooling fans. These fans
operate at full speed whenever AC is applied and the unit is producing DC
output.
type and does not require lubrication. It is equipped with a filter to keep
debris from being sucked into the unit. It is recommended that this filter be
removed and rinsed with water occasionally to ensure adequate air flow,
particularly if the PM is installed in a dusty or particle-filled environ ment.
Simply pry off the filter retainer with a flat tip screwdriver to clean or replace
the filter.
it may need to be replaced. (Replacement fans available from NEWMAR.
Specify part number 999-1208-0, Replacement Fan with PCB connector.)
if only one has failed.
Adjustment Range
12.2 - 15V DC
24.4 - 30V DC
48.8 - 60V DC
N/A
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DC Fuses:
d.c output wiring is protected by internal DC output fuse(s). The
Always disconnect AC to the PM before checking fuses. To replace the DC
If the battery is connected to the PM output with backwards polarity,
C) Cooling Fans
To maximize the life of the internal components and to allow continu ous
Preventative Maintenance: The fan is a maintenance-free ball-bearing
If the fan fails to operate when the PM is turned on and a load is applied,
Fan Replacement Procedure
Note: It is recommended that both fans be replaced at the same time, even
1. Disconnect ac power from PM.
2. Remove the plastic fan filter retainer on each fan. Use a small slotted
screwdriver if necessary. Remove filters.
3. Unscrew the four philips head screws that secure the fans to the PM.
Remove the four white plastic stand-offs from each fan along with the
plastic finger guards. Install the finger guards, stand-offs and screws on
to the replacement fans.
4. Un-plug the two 2 conductor fan powerleads from the circuit board. Use
a small sloted screwdriver if necessary to unlock the plug from the
mating board connector.
5. When installing replacement fan:
A. Make sure each fans cable passes through the slot in the front
panel and does not impede fan blade rotation.
B. Make sure the fan air flow, which is indcated by an arrow on the
top of the fan, points into the Power Module.
6. Attach fans to PM with the eight screws and re-install fan filters (clean
first) and filter retainers.
7. Re-connect ac power to PM and confirm fans operate.
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