Dwyer 8B - Manual (Page 31)

Page 31
PRECAUTIONS
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).
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
orque: 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.
DANGER
WARNING