2) To provide for parallel/redundant “N + 1” power system reliability — Certain
critical d.c. systems, such as those which power emergency service
communications equipment, must remain fully powered, even in the event of a
failure of one of the power supply/battery chargers. To provide this extra measure
of reliability, one more charger is wired into the system than is required for normal
operation. If, for instance, 70 amps is required for a 24 volt system, two of the PT-
24-35CE wired in parallel would normally be sufficient. To provide “N + 1”
redundancy a third PT-24-35CE is wired in parallel with the others. That way, if one
unit were to fail, the remaining two could continue to power the load until the failed
unit could be replaced or repaired. FIGURE 5 shows a typical “N + 1” wiring scheme.
FIGURE 5: TYPICAL PARALLEL/REDUNDANT “N + 1” WIRING
IMPORTANT: Install fuses at batteries per ABYC recommendations.
When wiring chargers together in parallel, remember that the wire gauge for each
charger will remain the same as if it were wired into a system by itself.
G) a.c. Input Wiring
NOTE: (For marine applications) THE INSTALLATION AND PROTECTION OF
VESSEL WIRING ASSOCIATED WITH BATTERY CHARGERS SHALL COMPLY
WITH ABYC STANDARDS E-8) AC ELECTRICAL SYSTEMS ON BOATS, E-9)
DC ELECTRICAL SYSTEMS ON BOATS, AND A-20) BATTERY CHARGING
DEVICES.
1) PT-20CE, PT-40CE, PT-24-20CE
These models are provided with an IEC certified a.c. cord which may be plugged
into the charger and a proper outlet. If the plug is not suited to the available outlet,
1) obtain an IEC cord with appropriate plug or 2) obtain the correct plug for the 2)
Note: This diagram
does not illustrate
a complete system.
Refer to ABYC
Standards E-8) AC
Electrical Systems
on Boats, E-9) DC
Electrical Systems
on Boats, and A-20)
Battery Charging
Devices.
To Critical 70 amp load(s)
Bank 1 Bank 2 Bank 3
PT-24-35CE
PT-24-35CE PT-24-35CE
*
*
*
* Note: d.c.
chassis
grounding
conductor
must not be
more than one
size under that
required for the
d.c. charging
conductors.
outlet and install it on the provided IEC cord. When installing the plug, pay careful
attention to the pin wiring as follows:
Brown ....................................................................................... a.c. Hot (fused)
Blue ................................................................................................ .a.c. Neutral
Green (or Green with Yellow Stripe) ....................... a.c. Ground (safety,earth)
As shipped from the factory, the charger is set up for 230V a.c. input. For 115V a.c.
applications you must:
1) Slide the recessed 115/230 input select switch located on the left hand side of
the charger into the proper position. Positions are identified on the front of the
charger.
2) Replace the input fuse as explained in section 3) Input Fuse Replacement, on
page 15. The correct fuse for 115V applications is attached to the hang tag on the
BATT. 1 terminal of the charger. If it is missing, see the INPUT/OUTPUT FUSE
VALUE table in the SPECIFICATIONS section of this manual to determine the correct
fuse value.
A power cord cable clamp has been provided to prevent accidental disconnect of
the a.c. cord. After the plug has been inserted into the charger, snap the pre-formed
clamp around the a.c. input cable as close to the insertion point as practicable and
use a screw to fasten the clamp tightly to the wall or bulkhead on which the charger
is mounted. (See FIGURE 2 or FIGURE 3.)
Hard-wiring a.c. input
If desired, the a.c. input to your charger may be hard-wired directly to the a.c.
distribution panel. Install the charger end of the provided input cord as described
above, then cut off the plug and splice onto three conductor marine-grade cable
with crimp butt connectors, observing color codes and fuse/circuit breaker ratings
as above. For all models use minimum 16 AWG cable.
All charger wiring should be made in accordance with UL, U.S. Coast Guard
and/or A.B.Y.C. regulations and recommendations, as well as all relevant local
codes. See REFERENCE APPENDIX for sources.
fuseholder
input
connector/
adaptor
(115 or 230V)
a.c. input
terminal block
strain
relief
115V a. c. selector
Caution - Read before applying a.c. power
For all installations:
Install the appropriate 115V or 230V input
adaptor (keyed for correct orientation) from
the provided installation kit. A fuse for 230V
a.c. applications has been factory installed.
For 115V a.c. input applications:
Replace the factory installed 230V input fuse
(located beside this a.c. entry cover) with the
fuse provided for 115V use (attached to the
hang tag on BATT. 1 terminal)
– See manual for detailed a.c. wiring
instructions –
Models: PT-70CE, PT-24-35CE
FIGURE 6:
A.C. INPUT WIRING COMPARTMENT
Hot
Ground
Neutral
12
13
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