3
Effective 08 2021 Drawing No. LP1146
To a 3.5 inch Host
1. Align the latches of the module with the host case such that
the backplane connector shroud on the module cover aligns
with the backplane connector opening in the host case.
2. Insert the module latches into the openings in the host case
by slightly deflecting the latches inward.
3. Press the module into the host case evenly until the latches
engage.
4. Install Module Locks between each module as shown by fully
inserting the legs of the Module Locks into the slots in the
case until the button on the Module Lock aligns with the hole
provided in the case. Press fit the button into the hole. Repeat
this installation between each module in your system to
provide the most secure installation.
5. When you have finished adding modules, the rear cover
should be installed in the same manner as the modules.
Removing a Module
To remove a module from the assembly, first remove the
module locks using a small screwdriver as shown. Then disengage
the latch by deflecting the latch inward or by using a small screw
driver, inserting it into the slot in the side of the case, and prying
the latch inward to disengage the lat. Once the latches are
disengaged, pull on the module and remove it from the assembly.
WIRING
Wiring Connections
All power, input and output (I/O) wiring must be in accordance
with Class I, Division 2 wiring methods and in accordance with
the authority having jurisdiction. When connecting relay contacts,
you must use a Class 2 circuit according to National Electrical
Code (NEC), NFPA-70 or Canadian Electrical Code (CEC), Part I,
C22.1 or a Limited Power Supply (LPS) according to IEC/EN
60950-1 or Limited-energy circuit according to IEC/EN 61010-1.
Electrical connections are made via cage-clamp terminal blocks
located on the back of the meter. Strip and connect the wire
according to the terminal block specifications on Page 2.
Please take care to observe the following points:
– The power supply must be mounted close to the unit, with
usually not more than 6 feet (1.8 m) of cable between the
supply and the PM-50. Ideally, the shortest length possible
should be used.
– The wire used to connect the PM-50’s power supply should
be at least 22-gage wire suitably rated for the temperatures
of the environment to which it is being installed. If a longer
cable run is used, a heavier gage wire should be used. The
routing of the cable should be kept away from large
contactors, inverters, and other devices which may generate
significant electrical noise.
– A power supply with an NEC Class 2 or Limited Power Source
(LPS) and SELV rating is to be used. This type of power supply
provides isolation to accessible circuits from hazardous
voltage levels generated by a mains power supply due to
single faults. SELV is an acronym for “safety extra-low
voltage.” Safety extra-low voltage circuits shall exhibit
voltages safe to touch both undernormal operating conditions
and after a single fault, such as a breakdown of a layer of
basic insulation or after the failure of a single component has
occurred. A suitable disconnect device shall be provided by
the end user.
LEDs
LED/STATE MEANING
Fast blink Module is initializing.
Solid Module is running normally.
Rear Cover
Position 1
It is recommended that a
relay module be installed
directly onto the back of
the host (shown below),
not on the back of any
other module.
WARNING - Disconnect all power to the unit before
installing or removing modules.
AVERTISSEMENT - Débranchez l’alimentation électrique
de l’appareil avant d’installer ou de retirer des modules.
CAUTION: The user should avoid a wiring configuration
that connects the isolated common of the AO module
to the input common of the PM-50, which defeats the
isolation barrier.
4-
3+
2-
1+
ANALOG
OUTPUT
OUTPUT
0-20 mA
0-10 V
ANALOG
STS
Status LED
