H) Temperature Compensation Option; I) Alarm Contacts; Iv) Operation; A) Three Stage Charge Regimen - NewMar PT-24-45W Bb8Db2Cc8C9B8A4Bb2Bbe763F

However, when the charger is in the float voltage mode over
lengthier periods of time, gelled electrolyte in a sealed battery is
not susceptible to evaporation, as is the non-immobilized electrolyte
of a wet lead acid battery. This evaporation can be accelerated by
the applied voltage. Consequently, the ideal float voltage is slightly
higher for a gel-cell than a lead acid battery.
Some batteries are available which do not conform to conventional
descriptions as "gel-cell" or "lead-acid". If you are unsure about your
battery type, consult the manufacturer and use the battery type
selector setting which most closely conforms to the recommended
voltages. See the SPECIFICATIONS section for the actual preset
charge and float voltages for each battery type and charger
model.

H) Temperature Compensation Option

Installing the Probe – PT-24-60W, PT-24-95W, and PT-32-70W
Reference Figure 3: A.C. Input Wiring/TP Probe, page 7.
The optional Temperature Compensation Probe (available from
NEWMAR, model TP is provided with 25' of cable (optional model
TP-40 with 40' for cable), with the probe at one end and a keyed
five-pin plug at the other. Installation of the probe proceeds as
follows:
1) Remove the charger's front cover by loosening the four slotted
mounting screws. These screws are captured, do not remove them.
2) Pull the cover straight off the chassis.
3) Insert the temp probe sensor end through the Temperature Probe
cable feed through from the inside of charger and pull the cable
through.
4) Plug the TP's 5 pin plug into the mating socket and re-install the
charger's front cover. Note: Do not over-tighten screws. They should
be snug (approx. 2 turns.)
5) It is recommended that the cable running to the battery be
secured with the provided cable clamps to prevent the plug from
accidentally being dislodged.
6) The probe itself should be mounted on the inside of the battery
box, or more ideally, mounted directly onto one of the batteries
using a clamp or a small amount of silicon-type adhesive.
Important note: When wiring multiple units in parallel and using
the temperature compensation option, you must use a separate
probe for each charger, and the probes must be mounted close
together in the same battery box or on the same battery for proper
operation.
Temperature Compensation Probe Function
Because low battery temperature increases resistance to charging
and high battery temperature reduces impedance, requiring
a lower charge voltage, the ideal charging voltage will vary
depending on the temperature of the battery's environment when
it is being charged.
If a charger has a fixed output voltage which is ideal at, say 77° F,
that same output may cause a battery charged in a consistently
high temperature environment to be overcharged, resulting in
10
P.O. Box 1306, Newport Beach, California 92663 • Phone: 714-751-0488 • Fax: 714-957-1621 • E-Mail: techservice@newmarpower.com
excessive loss of electrolyte. Conversely, if the batteries are located
in a consistently cool environment, they may be chronically
undercharged, resulting in sulfation of the battery plates. Either of
these two conditions will shorten battery life.
Therefore, the Phase Three charger is designed to utilize an optional
probe which provides automatic temperature compensation.
The function of the probe is to signal the charger to fine tune its
output voltage so that it is properly optimized for the temperature
of the battery or battery environment. The adjustment rate is
approximately -5 mV per cell per °C.
To give some idea of the effect of the temperature compensation
probe, the chart below lists the charge/float output voltages of the
charger when no sensor is installed (or when batteries are at 25°
C) and some sample charger output voltages at colder or hotter
battery temperatures with the probe installed:
24 Volt
Temp º C
10
20
25
30
40
50**
32 Volt
Temp º C
10
20
25
30
40
50**
** Charger will turn off at approximately 50º c battery temperature
and reset automatically once battery temp. drops approx. 5ºC.

I) Alarm Contacts

The charger provides one set each of dry alarm contacts: AC
Fail and DC Fail. These can be used to activate a light, buzzer if
connected to a supervisory alarm system. Contacts are rated: 30
VDC @ 1 Amp, 110 VDC @ 0.3 Amps.

IV) OPERATION

A) Three Stage Charge Regimen

The Phase Three Battery Charger features the three stage charge
regimen which is widely recommended by battery manufacturers
for allowing the fastest possible recharge time without loss of
batteries' electrolyte (gel or liquid) which may be caused by
sustained charging at higher voltages.
This three stage regimen is initiated each time A.C. is first applied,
when drained batteries are most likely to be encountered, and
proceeds slowly or quickly through each stage depending on the
battery's relative state of charge. The L.E.D. Status Indicator on the
front panel indicates which stage the charger is in.
www.newmarpower.com
Lead Acid/AGM
Float Absorption Float
28.0 29.6 28.4
27.4 29.0 27.8
27.1 28.7 27.5
26.8 28.4 27.2
26.2 27.8 26.6
25.6 27.2 26.0
Lead Acid/AGM
Float Absorption Float
37.3 39.4 37.8
36.5 38.6
36.1 38.2 36.6
35.7 37.8 36.2
34.9 37 34.6
34.1 36.2 34.6
C
OK
FAIL
DC
FAIL
GEL
Absorption
29.2
28.6
28.3
28.0
27.4
26.8
GEL
Absorption
38.9
37 38.1
37.7
37.3
36.5
35.7
C
OK
FAIL
AC
FAIL