GE Series 90-30 PLC

8-40 Series 90-30 PLC Installation and Hardware Manual – August 2002 GFK-0356Q
8
IC693PTM100/101 Power Transducer (PTM)
The PTM is used for measuring electrical power consumption or for monitoring voltages between
an electrical generator and its power grid. It connects to user-supplied current and potential
transformers, which furnish the input signals the PTM uses to calculate its data. Since one of the
PTM’s components is a Series 90-30 PLC module, the PLC can use the data gathered by the PTM
for data reporting, fault monitoring, generator control, or demand charge reduction/load shedding
applications. The PTM consists of three parts, which are all included under one catalog number:
 PTM Processing Module (PTMPM) - a module that mounts in a Series 90-30 Rack.
 PTM Interface Module (PTMIM) - a panel-mounted circuit board. This board interfaces
between the PTMPM module and the input transformers (current and potential).
 Interface cable - connects the PTMPM module to the PTMIM circuit board.
Difference Between PTM100 and PTM101
The only difference between the IC693PTM100 and IC693PTM101 is in the length of their
interface cables. The PTM100 comes with a 19” (0.5 meter) cable, and the PTM101 comes with a
39” (1 meter) cable.
Capabilities
A single PTM is capable of performing any one of the following tasks, as selected by the
appropriate %Q bit:
 Measure power parameters for three individual single phase circuits.
 Measure power parameters for one 3-wire single phase circuit (120/240 VAC).
 Measure power parameters for one 3-phase circuit (selectable between Wye or Delta type).
 Measure and compare power parameters between a 3-phase generator’s output phases and one
power grid phase.
 Measure and compare power parameters between one generator output phase and one power
grid phase.
Operating Modes
The PTM can operate in either of the following two modes, which are selectable by a %Q bit in the
PLC application program:
■ Power Monitor Mode - In this mode, the PTM samples either Single Phase or 3-Phase AC
voltages and currents and uses the data to calculate numerous power values. For 3-Phase
operation, Wye or Delta, can be selected.
■ Synchro Monitor Mode - In this mode, the PTM samples a Single-Phase or 3-Phase AC
voltage produced by a generator, and one voltage from the associated power grid, then
develops voltage, frequency, and relative phase information.