Unit Description
31
Electric Standby (Model 50
Units Only)
The Electric Standby option allows the unit to be
operated on either the diesel engine or external
electric power. The units are supplied to operate
on three phase power.
Standard Model 50 Features
The following features are standard equipment on
units equipped with Electric Standby.
• Automatic Diesel/Electric Selection – The
unit will automatically switch to electric
operation when a power cord is connected and
the standby power is switched “on”. The unit
can also be programmed to automatically
switch back to diesel power if the standby
power is switched off or fails.
• Automatic Overload Reset - The overload
relay resets automatically after the motor
cools. See “Overload Relay” on page 89 for
more information.
• Hot Gas Heat - Hot gas heat is utilized on
standard model 50 units.
• Automatic Phase Correction - The control
system features two motor contactors. This
allows correct motor rotation regardless of
phase rotation on the incoming power.
High Voltage Tray
The high voltage tray contains the contactors,
overload relay and phase select module used to
operate the drive motor on units equipped with
Electric Standby. The contactors are controlled by
+12 volt dc control signals from the Interface
Board. The high voltage tray is located inside the
control box just to the right of the
Microprocessor/Interface Board Assembly.
Phase Detect Module for Truck Unit
Model 50 Applications
The new phase detect module is designed to
monitor both single and 3 phase voltages from
160 volts AC thru 510 volts AC.
The Phase Detection Module will detect missing
phases, phase rotation and low voltage on three
phase power.
Figure 7: Phase Detect Module
CAUTION: High voltage AC power is
present whenever the unit is operating in
Electric mode and whenever the unit is
connected to external standby power.
Voltages of this magnitude can be lethal.
Exercise extreme caution when working
on the unit.
THERMO KING
9131C98G06
L1
L2
L3
0202
Brown
Blue
Black
AJA1501
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