Control Module - Teledyne 514 Instruction Manual

2.0 Operational Theory
Power for the detector module is provided by a center-tapped trans-
former which takes 115 VAC input, reduces it to 40 VAC, then feeds the
voltage to the DC power supply. An additional winding on the transformer
provides output power to the E-to-I card.
The power supply utilizes a fullwave rectifier in order to provide +24
VDC unregulated. The 24 VDC is further filtered, then fed through a
voltage regulator to obtain +15 VDC regulated.
As noted previously, the filter wheel is driven by a synchronous AC
chopper motor which operates at 1800 RPM. The filter wheel performs
two functions: (1) switching filters, and (2) chopping the optical signal to
give pulses which can be amplified for high quality processing.

2.1.5 Control Module

The control module provides voltage and current output signals which
are properly scaled for the application, alarm signals in the form of relay
contacts, and a meter output. Optional provisions are also included for an
automatic zero and dual-range capability.
Upon arrival at the control module, the milliampere signal is con-
verted to a 0 to +2 volt full scale output for connection to the span
potentiometer (see dwg. A-14620). An optional millivolt output can also be
provided by the I-to-E converter circuit card. At this point, fine zero
control is also applied by means of a potentiometer located on the front of
the module.
The voltage is then scaled so that 1 VDC full scale output is obtained
at the center of the span potentiometer. This signal is coupled through an
extended voltage amplifier circuit and used to drive the 0 to 100 A meter
on the control module.
The standard 0 to 1 VDC output is also generated by the extended
voltage amplifier circuit (see dwg. B-16221).
The 0 to 1 VDC full scale from the span potentiometer is connected to
the alarm comparator circuit (see dwg. B-14718) where it is used to drive a
pair of amplifier circuits which couple the alarm setpoints to relays K1 and
K2.
A current output (normally 4 to 20 mA) is optional. If desired, an
optically isolated current transmitter can be installed in the explosion-proof
control module.
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Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies