Typical application, English – West Control Solutions 9500 User Manual
Page 20
EN61010 - /CSA 22.2 No 1010.1 92
Compliance shall not be impaired when fitted to the final installation.
Designed to offer a minimum of Basic Insulation only.
The body responsible for the installation is to ensure that supplementary insulation suitable for
Installation Category II or III is achieved when fully installed.
To avoid possible hazards, accessible conductive parts of the final installation should be
protectively earthed in accordance with EN61010 for Class 1 Equipment.
Output wiring should be within a Protectively Earthed cabinet.
Sensor sheaths should be bonded to protective earth or not be accessible.
Live parts should not be accessible without the use of a tool.
When fitted to the final installation, an IEC/CSA APPROVED disconnecting device should be used
to disconnect both LINE and NEUTRAL conductors simultaneously.
A clear instruction shall be provided not to position the equipment so that it is difficult to
operate the disconnecting device.
*
EMC Immunity
EMC immunity may be improved by fitting large Ferrite cores around the sensor cables at the
point where they enter the cabinet and an earth bond is recommended.
TYPICAL APPLICATION
In this example the load temperature is monitored by a temperature transducer/transmitter
which provides a 4–20mA input signal to the controller. The 4–20mA output has been
allocated to SP1 to drive an SCR power controller providing a phase angle controlled output to
the heater.
F1 Fuse:
1A time lag type to IEC127. CSA/UL rating 250Vac
F2 Fuse:
High Rupture Capacity (HRC) Suitable for maximum rated load current
S1 Switch:
IEC/CSA/UL Approved disconnecting device.
20
1
2
3
4
5
6
7
8
L
N
4–20mA
INPUT
(–)
(+)
20
21
22
23 24
Mains
S1
L
17 18
19
F2
N
Model
9 5 B 1 1 P B – – –
F1
4–20mA
Transducer
User configurable
alarms
(–)
(+)
Analogue
power
controller
Heater
*
TYPICAL APPLICATION
English