Woodward MicroNet TMR 5009, Installation/Hardware Manual

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Manual 85580V2 5009 Installation/Hardware
Woodward 9
Two ATMs are provided and used with each 5009 control. Refer to Figure 4-19
for an overview of modules and ATMs used. Each ATM connects to the control’s
three independent “MPU & Analog I/O” modules through individual cables, and
provides a common cage-clamp terminal connection for customer field wiring. An
ATM contains circuitry for two speed sensor inputs, four analog inputs, two
analog outputs, and one proportional actuator output.
Because of the differences between sensing circuitry required to interface with
passive (MPUs) and active (proximity) probes, separate ATM terminations are
provided for each probe type. This allows a simple method of field selecting the
type of speed input based on the type of probe used. Depending on a MPU’s
limitations, each MPU input can be jumper-configured to allow it to drive either
two or three inputs (some MPUs cannot drive three inputs). See Chapter 6 of this
manual for MPU input impedance information. A fused 24 Vdc source, with
isolation diodes on the power, common, and output source lines, is provided for
each speed input to power system proximity probes. Each ATM contains circuitry
to interface with 12 V or 24 V proximity probes.
Analog inputs may be used with two-wire ungrounded (loop powered)
transducers or isolated (self-powered) transducers.
All analog and actuator output circuits allow each kernel to contribute one third of
the output’s total current. For dual coil actuators, kernels A and B drive one coil
and kernel C drives the second coil. Current readback circuitry identifies failed
modules and allows the remaining outputs to be adjusted accordingly.
Figure 2-6. Analog Termination Module Diagram