Dwyer 4C - Manual (Page 22)

Page 22
PRECAUTIONS
DANGER! Caution! Electric Shock!
1. Do not touch the AC terminals while the power is supplied to the
controller to prevent an electric shock.
2. Make sure power is disconnected while checking the unit inside.
3. The symbol indicates that this Controller is protected throughout by
DOUBLE INSULATION or REINFORCED INSULATION (equivalent to
Class II of IEC 536).
WARNING!
Mount the controller in a location that will not be subject to excessive
temperature, shock, or vibration. All models are designed for mounting in
an enclosed panel.
1. Always use recommended solder-less terminals: Fork terminals with
isolation (M3 screw, width is 7.0mm (6.0mm for 32B Series), hole
diameter 3.2mm).
Screw size: M3 x 6.5 (With 6.8 x 6.8 square washer). Screw size for 32B
Series: M3 x 4.5 (With 6.0 x 6.0 square washer). Recommended tightening
torque: 0.4 N.m (4kgf.cm). Applicable wire: Solid/twisted wire of 2 mm 2 ,
12AWG to 24AWG. Please be sure to tighten them properly.
2. Do not allow dust or foreign objects to fall inside the controller to prevent
it from malfunctioning.
3. Never modify or disassemble the controller.
4. Do not connect anything to the “No used” terminals.
5. Make sure all wires are connected to the correct polarity of terminals.
6. Do not install and/or use the controller in places subject to: Dust or
corrosive gases and liquid, high humidity and high radiation, vibration
and shock, high voltage and high frequency.
7. Power must be off when wiring and changing a temperature sensor.
8. Be sure to use compensating wires that match the thermocouple types
when extending or connecting the thermocouple wires.
9. Please use wires with resistance when extending or connecting a platinum
resistance sensor (RTD).
10. Please keep the wire as short as possible when wiring a platinum
resistance sensor (RTD) to the controller and please route power wires as
far as possible from load wires to prevent interference and induce noise.
11. This controller is an open-type unit and must be placed in an enclosure
away from high temperature, humidity, dripping water, corrosive materials,
airborne dust and electric shock or vibration.
12. Please make sure power cables and signals from instruments are all
installed properly before energizing the controller, otherwise serious
damage may occur.
13. Please do not use acid or alkaline liquids for cleaning. Please use a soft,
dry cloth to clean the controller.
14. Wait at least one minute after power is disconnected to allow capacitors to
discharge, and please do not touch any internal circuit within this period.
15. This instrument is not furnished with a power switch or fuse. Therefore, if
a fuse or power switch is required, install the protection close to the
instrument. Recommended fuse rating: Rated voltage 250 V, Rated
current 1 A. Fuse type: Time-lag fuse.
16. Note: This controller does not provide overcurrent protection. Use of the
product requires that suitable overcurrent protection device(s) must be
added to ensure compliance with all relevant electrical standards and
codes. (Rated 250 V, 15 Amps max). A suitable disconnecting device
should be provided near the controller in the end-use installation.