Kistler-Morse KM STXPlus - Manual (Page 7)

CHAPTER 2: HARDWARE INSTALLATION
most convenient to route the conduit or
cables. Hole location is critical for proper
PCB installation. Check clearances to ensure
fittings and wire routing will not interfere with
the PCB or enclosure door. Refer to Drawing
TI-SP.STXP-01 in Appendix D.
WIRING SYSTEM
This section describes how to wire the
junction box, power, and auxiliary equipment
to the STXplus. Refer to the specifications
in Appendix A and Drawing TI-SP.STXP-02 in
Appendix D.
WARNING!
All wiring must comply with government
or local codes.
Wiring Junction Box to STXplus
CAUTION
Do not route junction box cables in the
same conduit with AC power cables.
NOTE
1. Seal all conduit fittings against water
entry. Install conduit drains at the
conduit’s lowest elevation(s) to allow
condensation to drain.
2. All wiring routed between junction boxes
and STXplus must be continuous
(no splices).
Wiring Power
WARNING!
When connecting power to this unit,
power wiring must comply with the
national wiring requirements for the
country in which the equipment is
installed and the ground conductor must
be connected to the protective earth (PE)
terminal.
See Appendix D (Page D-8) for Installation
Instructions for AC Line Varistors.
Refer to the instructions below and
Appendix D.
DC: STXplus operates on 12-30VDC
power
AC: STXplus operates on 100-240VAC,
47-63Hz
NOTE
The standard lead colors for AC power in
North America are green for ground, black for
hot, and white for neutral.
WIRING CURRENT OUTPUT
External Current Loop Power Supply
The STXplus Current Transmitter Loop is
powered by the STXplus power supply.
However, an external power supply may
be desired for some applications. The
maximum allowable voltage from the
external power supply is 30VDC. The
minimum allowable voltage is based on the
loop resistance, allowing a 2V overhead for
the output’s current sensing.
For example:
1,000Ω x 0.2A = 20V
Minimum voltage = 20V + 2V = 22V
Wire the current transmitter external power
supply as shown in Appendix D. Move the
SW9 switch on the STXplus PCB to the
Ext position.
Sealing Openings in the Stand-Alone
STXplus Enclosure
After conduit and cable installation is
complete, seal around the openings in the
STXplus enclosure to prevent moisture
seepage.
CAUTION
Only use Sikaflex 1A polyurethane sealant
or Dow Corning RTV 739 or RTV738.
Other sealants may contain acetic acid,
which is harmful to electronics.
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