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TM 55-4920-412-13&P
Table 3-1. Operator's Controls (Cont)
Control, indicator or connector
Function
SENSOR SIMULATOR (Cont)
ROTOR SPEED
NOR CAL
Selects mode of operation - normal or Calibration for checking % RPM R
indicator.
HI LO
When ROTOR NOR CAL switch is set to CAL, HI LO switch allows high
and low Calibration points of % RPM R indicator to be checked.
Variable control
Used when NOR CAL switch is at NOR, to check operation of Rotor
Speed indicator as simulated % RPM rotor speed signals cover range
from minimum to maximum.
LOW ROTOR SPD
Indicates operation of ROTOR SPEED LO switch.
ROTOR OVER SPD RESET switch
Used to reset rotor overspeed warning indicator.
LAMP SUPPLY OVERLOAD NO. 1
Indicates operation of LAMP SUPPLY OVERLOAD switch
LAMP SUPPLY OVERLOAD NO. 2
LAMP SUPPLY OVERLOAD switch
Used to select NO. 1 and NO. 2 lamp supply overload conditions.
INPUT POWER Lamps:
When lighted they indicate this
115 VAC
AC input power Is applied
28 VDC
DC input power is applied.
INPUT POWER switch
Three-position switch that controls application of 115 vac and 28 vdc
power. At ON, input power is connected. At OFF, Input power is
disconnected. At SIM ONLY, input power to interconnect connector (J5)
Is removed. This removes power from Unit Tester, de-energizing it
without removing power from SIMULATOR.
LAMP TEST switch
NO. 2 Low Oil Pressures, NO. 1 and NO. 2 High Oil Temperature,
Low Rotor Speed, NO. 1 and NO. 2 Engine Out, and both Lamp
Supply Overload lamps on LTS.
INTEGRAL LIGHTING switch
To select internal or external integral lighting power.
115 VAC 2A fuse
AC power line fuse. Fuse blows if primary circuits of transformers T1,
T2, T3, T4 become overloaded due to circuit malfunction.
28 VDC 8A fuse
DC input power fuse, protects 28 vdc circuits.
5 VAC 8A fuse
Protects 5 vac lighting circuits.
UNIT TESTER (Figure 3-2)
DISPLAY CONTROLS
DIGITAL SET
Thumbhole selector switch.
DIGITS OFF ON OFF switch
Controls digit display.
DISPLAY UPDATE ON OFF switch
Controls display update pulses.
ANALOG SET FAST SLOW STOP switch
Controls fast, slow, and stop gates of internal shift register
3-7
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