LS SERIES SERVICE MANUAL
ISSUE 4.0 OVERVIEW 7
Also note that if a Hand Held Remote is supplied, the machine type, loadcell calibration and
extensometer calibration can ONLY be changed using the NEXYGEN Plus 3 software.
The USB connection can be used to output test data from the machine to a Datalogger or to
Windows Hyperterminal.
1.8 Electronic PCBs and Power Supplies
The main frame contains 2 electronic circuit boards and a switch mode power supply. The Full
Control Console and the Hand Held Remote both contain a Console PCB and an LCD Display
assembly. Each loadcell is supplied with an integral amplifier inside the loadcell plug. Each
extensometer is supplied with an integral amplifier inside the extensometer plug.
The Main PCB contains the microprocessor, digital circuits and analogue circuits. This is
powered from the switch mode power supply that provides +5V, +15V and -15V. This power
supply also powers the loadcell amplifier and any optional external extensometer amplifiers.
The Motor Drive PCB contains the power rectifier, smoothing capacitor and drive electronics.
This is powered from the mains transformer which provides approx. 33V AC for the LS1 variant
machines and 50V AC for the LS2K5E and LS5S machines. This AC supply is rectified and
smoothed to give approximately +45V motor supply for the LS1 variant machines and 65V motor
supply for the LS2K5E and LS5S machines.
The PCB also generates a stable +12V for the motor over-current monitor. The Motor Drive
PCB also uses the +5V and +15V from the switch mode power supply.
Note that the Motor Drive PCB contains an EEPROM that is programmed with the
machine type and its serial number. If this PCB is replaced during servicing, the new
PCB MUST be programmed with the relevant data as shown in Diagnostic Mode
section.
Also note that the PCBs are multi-layered and are fitted with surface mounted
components so are NOT
considered to be field repairable. If a PCB fails, the usual
course of action is to replace it with a new one. Therefore it is recommended to keep
spare PCBs in your service stock.
A block diagram is shown in figures 1 and 2
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