Carrier 40 - Safety Devices; Table 1-3 Safety Devices - Microprocessor Controller

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Table 1-3 Safety Devices -- Microprocessor controller
Unsafe Conditions
Safety Device
Automatic
restart
with fault
cleared
Device setting
1 Excessive drop in pressure Automatic reset of low
pressure switch
YES
Cutout : --2.9 psig (-0.2 bar)
Timer 5 mn
2 Excessive current draw on all mi-
croprocessor outputs (evaporator
and condenser fan)
Electronic relay
YES
Self-protected opening
3 Excessive current draw control
circuit
Fuse on electronic board
NO
Self-protected opening
4 Excessive current draw motor
compressor
Overload relay
YES
See electrical wiring diagram
5 Excessive compressor discharge
pressure
Automatic reset of High
pressure switch (HP1,
HP3)
YES Timer 5 mn
6 Excessive current draw unit on
standby
Standby fuse
NO
SeefuseTable1-2
7 Excessive current draw unit on
road
Road fuse
NO
SeefuseTable1-2
8 Connection error on primary
transformer
Fuses
NO
SeefuseTable1-2
9 Excessive compressor motor
winding temperature
O.L.P. (overload protector)
YES
Self-protected opening
10 Clutch malfunction - road (exces-
sive current draw)
Electronic relay
YES
Self-protected opening
11 Clutch malfunction - road (insuffi-
cient current draw)
Electronic relay
YES
Detection of min. threshold
at 750 mA
12 Double power supply (road +
standby)
Microprocessor
YES
Display on Cab Command
until one of the 2 power sup-
plies have been discon-
nected.
13 Low battery voltage Microprocessor YES Cutout/cut-in at 10 V