Q/Z-1250 Power Trimaran
User’s Guide
P/N 95L-8001-00 (September 2017)
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 27
Battery Voltage Monitoring
The Hitec transmitter continuously monitors the Q/Z-1250 battery voltage; an alarm will sound when the
voltage becomes too low signaling that the boat should be brought back to shore. If the voltage falls below
a threshold value as shown below, control of the boat will no longer be possible.
Starting Voltage
26 – 27V
Default alarm set point
22V
Completely dead batteries
18V
The battery alarm voltage setting can be changed by the user if required (see
Setting the Low Voltage
Alarm
). The alarm set point can be lowered if it is safe to do so. Note that the voltage will drop as soon as
the throttle is opened and power is applied to the motors; this is normal. As the current to the motors in-
creases with speed, the voltage goes down slightly; this may trigger the alarm. The top speed of the boat
will also decrease as the battery voltage decreases.
If the low voltage alarm sounds prematurely you must recover the Q/Z-1250 immediately as
one or more of the battery packs or cells may not be properly connected.
Battery voltage at rest
Battery voltage with motors at full power
Figure 17.
Monitoring the Q/Z-1250 Battery Voltage
Failsafe Mode Selection
Should the remote control signal be lost, the boat is pre-programmed to enter an emergency “failsafe”
mode. This might happen under the following circumstances:
•
The transmitter batteries fail.
•
The boat goes behind a structure or large boat and is out of radio contact.
•
The boat is too far away and goes out of control range.
•
The transmitter is turned off.
Always check the transmitter battery power before starting work.
