ARMY TM 9-6675-349-12&P
MARINE CORPS TM 11039A-12&P
SECTION III. OPERATION UNDER UNUSUAL CONDITIONS
3-36. Operation in Extremely Rough Terrain. Not applicable.
3-37. Operation at Temperature Extremes.
a.
Operation in Extreme Heat.
(1) Operation of IPADS in ambient temperatures above 115 F may cause the internal BCU battery
temperature to approach or exceed 150 F.
CAUTION
IPADS batteries contain an internal thermal cutoff switch to protect them from
extreme heat. If the internal battery temperature approaches 150 F, the BCU
may not provide backup battery power for IPADS operation.
(2) Extended Mission. IPADS can be operated for long periods of time on vehicle battery power. If it is
necessary to extend a mission after operating IPADS at temperatures of 115 F or above, do not turn
vehicle off or turn IPADS DC INPUT power off before performing a one-position mark. The Hot Start
initialization procedure can be used to reinitialize IPADS if necessary.
(3) Transfer Between Vehicles. If a vehicle-to-vehicle transfer is required for an IPADS that has been
operated for long periods of time at temperatures of 115 F or above, perform a one-position mark
before switching over to backup battery power. The Hot Start initialization procedure can be used to
reinitialize IPADS if necessary.
b. Operation in Extreme Cold.
CAUTION
Permanent damage to the IPADS CDU Active Matrix Liquid Crystal
Display (AMLCD) screen may result from exposure to temperatures below
-40 F. When temperatures below -40 F are expected, remove CDU to a
warmer location or provide heat to keep temperature above -40 F. This
caution applies whether the IPADS is in operational configuration or in
storage.
Permanent damage to the IPADS CDU hard disk drive (HDD) may result
from operation at temperatures below 22 F.
(1) CDU Operation. Ensure that vehicle temperature is raised above 22 F using vehicle heater, prior to
installing CDU in vehicle. When powering up the IPADS at temperatures below 4 F, the CDU
power indicator, will flash to indicate that the CDU is warming up. This could take up to 5 minutes.
After the warm-up period, the CDU will operate as normal.
(2) If IPADS batteries have been stored for long periods of time at temperatures of 30 F or below it may
take at least one hour of operation for the batteries to warm up and the IPADS Battery Temperature
indicator light to illuminate. The time required to allow the IPADS batteries to reach their normal
rated operating temperature can be reduced by using vehicle heaters to heat the vehicle compartment
while running IPADS on vehicle power.
(3) Transfer Between Vehicles. If the BCU Battery Good and Battery Temperature indicators are not
illuminated before performing a vehicle-to-vehicle transfer, perform a one-position mark before
switching over to IPADS backup battery power. If IPADS shuts down during the transfer, reinitialize
it over the last marked point.
