Hach sc200, User Manual

Page: 19 / 875

Wiring for power
W A R N I N G
Potential Electrocution Hazard. Always disconnect power to the
instrument when making electrical connections.
W A R N I N G
Potential Electrocution Hazard. If this equipment is used outdoors or in
potentially wet locations, a
Ground Fault Interrupt device must be
used for connecting the equipment to its mains power source.
D A N G E R
Electrocution Hazard. Do not connect AC power to a 24 VDC powered
model.
W A R N I N G
Potential Electrocution Hazard. A protective earth (PE) ground
connection is required for both 100-240 VAC and 24 VDC wiring
applications. Failure to connect a good PE ground connection can
result in shock hazards and poor performance due to electromagnetic
interferences. ALWAYS connect a good PE ground to the controller
terminal.
1 2 T I & E
Install the device in a location and position that gives easy access to the
disconnect device and its operation.
The controller can be purchased as either a 100-240 VAC powered
model or a 24 VDC powered model. Follow the appropriate wiring
instructions for the purchased model.
The controller can be wired for line power by hard-wiring in conduit or
wiring to a power cord. Regardless of the wire used, the connections are
made at the same terminals. A local disconnect designed to meet local
electrical code is required and must be identified for all types of
installation. In hard-wired applications, the power and safety ground
service drops for the instrument must be 18 to 12 AWG.
Notes:
• The voltage barrier must be removed before making any electrical
connections. After making all connections, replace the voltage barrier
before closing the controller cover.
• A sealing type strain relief and a power cord less than 3 meters
(10 feet) in length with three 18-gauge conductors (including a safety
ground wire) can be used to maintain the NEMA
4X/IP66 environmental rating.
• Controllers can be ordered with AC power cords pre-installed.
Additional power cords may also be ordered.
• The DC power source that supplies power to the 24 VDC powered
controller must maintain voltage regulation within the specified
24 VDC-15% +20% voltage limits. The DC power source must also
provide adequate protection against surges and line transients.
Wiring procedure
Refer to the illustrated steps that follow and Table 1 or Table 2 to wire
the controller for power. Insert each wire into the appropriate terminal
until the insulation is seated against the connector with no bare wire
exposed. Tug gently after insertion to make sure that there is a secure
connection. Seal any unused openings in the controller box with conduit
opening sealing plugs.
( nglis K 13