CTEK D250SE Quick Start Manual page 3

Date: 2020-10-01
Version: 1.0
Consumers:
Consumers (max 80A continuously) should be connected to
the consumer output terminal of the SMARTPASS 120S. If the
service battery voltage becomes critically low, the consumer
output terminal is deactivated in order to protect the service
battery, i.e. under voltage protection.
Consumers that should not be affected by this under voltage
protection should be connected directly to your service
battery, typically high priority consumers like VHF radio.
Consumers connected to the consumer output receives
current from the alternator instead of the service battery
during driving. This makes the charging of the service battery
faster and if the battery is fully charged it is put in a rest state,
which increases the lifetime of the service battery.
Title: D250SE & SMARTPASS 120S
Alternator:
The Alternator is the power source for both D250SE and
SMARTPASS 120S, i.e. should be able to power the application
where these units are installed.
Smart alternators was introduced in the Euro 5 & 6 engines,
where they help the engine reduce its emissions by enabling
brake regeneration. If you have a Smart alternator connect
the red Smart Alternator signal cable to a +12V source that is
live when the engine is running (for example contact no. 15
Ignition in the DIN 72552 standard) in order to get proper
functionality from the D250SE / SMARTPASS 120S. Please
note, that connecting this wire to a source that is live
continuously will make the units active continuously as well,
possibly rendering a starter battery with low state of charge.
If the Alternator has a sense wire connected to the Service
battery make sure it is moved to the Starter battery when
installing the D250SE/SMARTPASS120S. Note, a sense wire is
typically found in Volvo Penta marine applications.
Cables:
For the best possible functionality follow the instructions in
the manual regarding cable dimensions and make sure the
cables are as short as possible in order to minimize voltage
drops.
All cables should be firmly mounted and preferably in a cable
protection tube minimizing wear and tear from the vibrations
in your vehicle.
Busbars can be used to make the installation neat and tidy
and the use of tubular ring terminals (size M8) properly
crimped will reduce unnecessary resistance in the
connections.
Note, the weaker cable recommendation to the negative
terminal (D250SE) is chosen since it only carries current to the
control electronics, not the charge current. The latter will flow
through earth, which is connected to the negative terminal of
your battery