User's Manual

Page 15 of 15
Thermo King Corporation Proprietary Information
4. Understanding REB Power Management
5.1 Power Status:
5.1.1 Full-On:
Conditions: Reefer is running, 8xp is high
Behavior: The REB reporting to website every hour for U.S. and 15 minutes for ESA, the power
status in the website is “ON”
5.1.2 Countdown and Conservative
Pre-Conditions: HMI is turned-off, Controller OFF, 8xP is low
Behavior:
a. Very similar to full-on. It will periodically reports to the website dependent on the
logging interval set when unit is OFF. The website will display unit as OFF. The
REB will save power as much it can since it takes power directly from the unit
battery including the door and fuel sensors if connected to the REB. Thus, it is
essential for REB to monitor the voltage level of the unit battery to ensure engine
start up when needed by the customer. When this voltage level ( default is 12 V
but configurable by TDAC)is achieved, the REB will wait for 5 minutes, send
alarm 253 and then switch to back-up battery as power source. This state of the
REB is known as “Conservative”.
b. Conservative can also be attained if countdown log counter is achieved. The
default countdown log interval is 24. This value is configurable by TDAC. When
countdown log timer expires the REB will switch back-up battery as power source
and send alarm 253 –telling customer that the REB is in back-up battery mode
and alarm notifications (doors and fuel) will be suspended. This states is also
known as “ Conservative”
c. If unit power is interrupted (i.e. unit battery being cut-off) it will switched to
back-up mode, REB in Conservative mode.
d. The website will display OFF in Conservative mode.
e. When REB is in Conservative state it will report to the website every hour with
location only.
f. The REB can be woken up before its logging/reporting interval if it has cellular
radio but not possible if REB has Wi-Fi only.
g. If the REB has WIFI radio only and in Conservative state, it will wait for the next
logging interval before it checks and execute requests made from the website.
5.1.3 Full-Null
Pre-Conditions: Back-up battery below is below 5.21V
Behavior:
a. When back-up battery is less than 5.21V the REB will quit working but will send
alarm 233 prior to switching to full-null.
b. The REB will transition to another state when unit is turned On.
c. The Full-null can also be attained if the conservative log counter expires. The log
counter is 96 as a default but configurable via TDAC.