AMETEK Compact i/iX Series - Manual (Page 93)

User Manual Compact i/iX Series
AMETEK Programmable Power California Instruments 93
5. Principle of Operation
5.1 Overall Description
The 751i/iX and 1501i/iX models are share a common architecture based on single 750VA power
amplifier module assembly (P/N 6005-400-1). Power to both amplifier modules is derived from a power
factor corrected bias supply PFC module (P/N 6005-704-1 for Series I or P/N 6005-718-1 for Series II).
For Series I units, the PFC assembly receives AC input power through an AC input transformer which
provides full isolation from the line and also accommodates 115V L-N or 230V L-N ac input selectable
through a voltage selection switch on the rear panel.
For Series II units, a high frequency input stage and switching transformer is used to provide a
universal input voltage range. No voltage selection is required on the Series II models.
The front of the unit houses the digital controller and waveform generator (P/N 6005-703-2 for Series
II) as well as the keyboard display assembly (P/N 6005-702-2). The entire controller front panel
assembly (P/N 6005-403-1) can be removed from the main chassis if needed.
5.2 Amplifier Assembly
The first Amplifier Assembly (P/N 6005-400-1) is located on the right hand side of the chassis. For
1501i/iX models, a second amplifier assembly is installed in the center of the chassis. Both amplifier
assemblies of a 1501i/iX model are identical and their positions can be swapped at will although there
is no reason to do so.
The power module contains two independent direct-coupled half-bridge amplifiers. The half bridges
may be operated independently (in LO RANGE only, 0 to 150 vac) for two-phase operation but this
capability is not used in the 751i/iX and 1501i/iX models where both half bridges are used for one
phase operation only. Each half bridge is rated for 375 VA. One output is taken from OUTPUT LEFT
to HV COM OUT and the other output is taken from OUTPUT RIGHT to HV COM OUT.
The half bridges may be operated together for a total of 750 VA. The LEFT amplifier will be the master
amplifier and it will drive the RIGHT amplifier.
In LO RANGE the OUTPUT LEFT and RIGHT lines are tied together and drive the load with respect to
HV COM OUT.
In HI RANGE (0 to 300 vac) the OUTPUT LEFT and RIGHT lines are separated and the output is
taken from OUTPUT LEFT with respect to OUTPUT RIGHT. HV COM OUT is not used in HI RANGE.
For 1501i/iX models, one additional module is paralleled with the master module to increase amplifier
capability to 1500 VA. The additional module acts as an auxiliary to the first, master, module.
5.3 PFC Assembly
The PFC Assembly (P/N 6005-718-1 for Series II) is located on the left hand front side of the chassis.
On Series II, a high frequency input front end and high frequency transformer is used to provide a
universal AC input range. The PFC module generates a high voltage AC which is rectified by the
Rectifier board (P/N 6005-719-1) to a dual regulated DC bus that provides power to one or two
amplifier modules.
5.4 EMI Filter
For Series II units, the EMI Filter is located in the rear of the chassis directly below the Relay/Interface
board. It filters the AC input line to meet conducted emissions requirements.