MTS 793 Controller Hardware
FlexTest GT Controllers
Introduction
22
Cable conduit
The chassis has a conduit that allows cables to be routed from the front
VMEbus modules to the rear transition modules and out of the chassis.
Power supply
Two power supplies are used. One pr5 V DC and ±15 V DC
for the plug-in modules; the other provides ±12 V DC for plug-in
modules and +24 V DC for hydraulic power and the chassis fan. The
power supplies have universal inputs and will adapt to any line voltage
between 90 and 264 V AC.
The power supply is protected with an external circuit breaker in the
On/Off switch that trips at a 10 amp overload. An internal fuse in the
power supply is not user accessible or repairable.
Cooling
The chassis is cooled with a fan. An overtemperature sensor is part of
the standard power supply assembly. If the internal chassis
temperature exceeds 50ºC, this sensor will light an amber indicator
located on the rear of the power supply module.
Hydraulic control
Hydraulic control is handled with two transition modules.
The Model 493.73 HPU Transition module has a connection to control
a hydraulic power unit. It includes connections for an emergency stop
button and digital I/O for system communications.
Typically, up to four Model 493.74 HSM transition modules can be
used to support up to eight HSM stations. Each HSM module includes
connections to support two stations. Each station supports an HSM, a
load unit, run/stop outputs, auxiliary outputs, and interlock controlled
outputs.
Interlocks
Two types of interlocks are supported, the system wide interlock and
station interlocks. The system wide interlock shuts down the hydraulic
power unit and all stations, and the station interlock shuts down a
single station leaving other stations running. The emergency stop
function on the Model 493.74 HSM transition board contains two
separate circuits, the system wide interlock (HPU) and the station
interlock (HSM).
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