Parr Instrument TDM User Manual
Installation Instructions for Tachometer
Display Module (TDM) in 4848 Reactor
Controller
Meter installation in 4848 Reactor Controller
1. Unplug the power cord of the 4848 controller. Remove the (2) screws located on the top/front cover at
the rear corners of the controller. Gently lift the cover
forward, which is hinged at the bottom, taking care
not to apply tension on any internal wiring.
2. If applicable, remove and discard the black hole
plug on the sloped front panel above the "RPM" text.
This can be done by pinching the clasps on the back
of the plug from the inside of the front plate.
555M
3. Insert the TDM (2084E) through the panel cutout,
from outside in, making sure the rubber gasket is
on the outside of the controller front panel. (If wires
are preinstalled, remove the terminal connector by
releasing the tabs on the sides of the module and
gently pulling the terminal connector off. Reference
photos below.) Slide the white mounting bracket
onto the module with the mounting screws pointing
towards the front panel. Slide the mounting bracket
forward until it touches the controller panel. The
clasps on the mounting bracket should align with the
groves on the module. Gently tighten the screws until the module is held into place. (If removed, reattach
the terminal connector.)
Terminal Connector Removal
TDM Installation
Meter installation in 4848 Reactor Controller (Continued)
Meter Installation Diagram
4848 Inside View
2
Parr Instrument Company
TDM Installation
Wiring installation in 4848 Reactor Controller
1. If applicable, remove the black hole plug on the back of the controller labeled RPM INPUT. This can be
done by pinching the clasps on the back of the plug from inside the back panel.
2. Insert the 4-pin receptacle (494E), on the A2106E harness, into the RPM input hole from the inside out.
Slide the ring terminal, from the A2106E green wire, onto one of the mounting studs. Mount the receptacle
using the (2) #4 keps nuts provided.
3. Locate the A1695E excitation board as shown.
Tach out
Tach in
A1695E Excitation Board
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