Eurotherm 3508 Manual

ENG
3508 and 3504 Process Controllers
This instrument is intended for permanent installation, for indoor use only, and to be enclosed in an
electrical panel.
Select a location where minimum vibrations are present and the ambient temperature is within 0 and
50 C (32 and 122 F).
o o
The instrument can be mounted on a panel up to 15mm thick.
To assure IP65 and NEMA 4 front protection, use a panel with smooth surface texture.
Please read the safety information before proceeding and refer to the EMC Booklet part number
HA025464. For details not covered in this guide a 3500 Engineering Manual part no. HA027988 is
available. These documents may be downloaded from www.eurotherm.co.uk.
Parts Supplied and Dimensions
D
C
B A
Controller sleeve
A 96mm 3.78inch
B
C 12.5mm 0.5in
Label
A
D 150mm (5.91in)
Latching Terminal
Panel retaining
ears block with
clips
covers
Instrument Terminals
3508
Live or 24V
(2)
Power
Neutral or 24V
(2)
Supply
Ground
Logic I/O A Digital
Logic I/O B Inputs/
Outputs
Logic I/O Com
Fixed Relay
(form C)
PV Input
T/C RTD mV mA
Polarising Keys (1). One per module
Polarising Keys (1). One per module
HA030143/1 CN25273

Plug in I/O Module Connections

Plug in I/O modules can be fitted in three positions in the 3508 and six positions in 3504. The
positions are marked Module 1, 2, 3, 4, 5, 6. With the exception of the Analogue Input module, any
other module listed in this section, can be fitted in any of these positions. To find out which
modules are fitted check the ordering code printed on a label on the side of the instrument. If
modules have been added, removed or changed it is recommended that this is recorded on the
instrument code label.
Relay (2 pin) and Dual Relay Module
First relay
Contactor
xA
•
Relay Panel
Hardware Code: R2 and RR
lamp etc
xB •
Voltage
Rating of relays: 2A, 264Vac max or 100mA, 12V
supply min to provide sufficient whetting current.
xC
Contactor
Relay Panel
xD
lamp etc
Second relay (dual relay only)
Change Over Relay
Contactor,
xA
Relay, Panel
•
Hardware Code: R4
lamp etc xB
•
Relay Rating: 2A, 264Vac max or 100mA, 12V
xC
min to provide sufficient whetting current.
Voltage
xD
supply
Triple Logic and Isolated Single Logic Output
•
+
Hardware Code: TP and LO
+ Output A
xA
•
+ Outputs Rating: (18Vdc at 8mA max.)
SSR or
Output B xB
•
thyristor
No channel isolation.
+
unit
Output C xC
•
Single Logic Output connections: D – Common
_
-
A – Logic Output
Common xD
Triac and Dual Triac
First triac
Raise
•
xA Hardware Code: T2 and TT
•
Voltage xB Combined Output Rating: 0.7A, 30 to 264Vac
Motorised
supply •
valve Dual relay modules may be used in place of dual triac.
xC
•
The combined current rating for the two triacs
xD
Lower must not exceed 0.7A
Second triac

Installation

B
1. Cut out the panel to the size shown.
A
Panel cut out
3504 controller A x A
92mm (
- 0.0 + 0.8)
A
A
3.62inch
(-0.00,+0.03)
3508 controller A x B
45mm (
- 0.0 + 0.6)
B
1.77inch (-0.00,+0.02)
2. Fit the IP65 sealing gasket behind the front bezel of the instrument
3. Insert the instrument in its sleeve through the cut-out.
4. Spring the panel retaining clips into place. Secure the instrument in position by holding it level
and pushing both retaining clips forward.
48mm 1.89in
5. Peel off the protective cover from the display
If the panel retaining clips subsequently need removing, they can be unhooked from the side with
either your fingers or a screwdriver.
To Remove the Controller from its Sleeve
2.49Ω resistors are
Ease the latching ears outwards and pull the controller forward.
also supplied for
each mA input When plugging back in ensure that the latching ears click into place to maintain the IP65 sealing
(1) Polarising keys are intended to prevent modules,
3504
not supported by this controller, from being fitted.
Supported modules are defined by the order code - the
Live or 24V (2)
Power
arrow on the polarising key points in the upward
Neutral or 24V (2) Supply
direction when these are fitted. An example of an
Ground
unsupported module is an unisolated module (coloured
Logic I/O A red) from a 2400 series controller. It is possible to fit
Digital
such a module but it is the users responsibility to
Logic I/O B Inputs/
ensure that it is safe to install it in the particular
Logic I/O Com Outputs
application. When this has been verified the polarising
key may be adjusted with a screwdriver to point in the
Fixed Relay
down direction.
(form C)
Wiring
Wire Sizes
PV Input
The screw terminals accept wire sizes from 0.5 to 1.5
mm (16 to 22AWG) and should be tightened to
T/C RTD mV mA
0.4Nm (3.5lb in). Hinged covers prevent hands or
metal making accidental contact with live wires.
For module functionality see 'Quick Code'.
The function of the connections varies depending on the type of module fitted in each position and
this is shown below.
Note: The order code and terminal number is pre-fixed by the module number (x). For example,
Module 1 is connected to terminals 1A, 1B, 1C, 1D; module 2 to 2A, 2B, 2C, 2D, etc.
•
All modules are isolated 240Vac CATII.
Snubbers
Snubbers are used to prolong the life of relay contacts and to reduce interference when switching
inductive devices such as contactors or solenoid valves. The fixed relay (terminals AA/AB/AC) is
not fitted internally with a snubber and it is recommended that a snubber be fitted externally. If
the relay is used to switch a device with a high impedance input, no snubber is necessary.
All relay modules are fitted internally with a snubber since these are generally required to switch
inductive devices. However, snubbers pass 0.6mA at 110V and 1.2mA at 230Vac, which may be
sufficient to hold on high impedance loads. If this type of device is used it will be necessary to
remove the snubber from the circuit.
The snubber is removed from the relay module as follows:-
1. Unplug the controller from its sleeve
2. Remove the relay module
3. Use a screwdriver or similar tool to snap out the track.
The view shows the tracks in a Dual Relay Output module.
Dual DC Output (Slots 1, 2 and 4 only)
•
+
Hardware Code: DO
xA
•
Output 1
- Output Rating: each channel can be 4-20mA
xB
or 24Vdc power supply)
4-20mA 20V – 30V
+
xC
Output 2 -
xD
High Resolution DC Retransmission & Transmitter Power Supply (Slots 1, 2 and 4 only)
+
xA
•
4-20mA
Hardware Code: HR
Output 1
-
xB •
Output Rating: Channel 1 (15 bit 4-20mA).
+
Channel 2 (24Vdc)
xC
20V – 30V
Output 2 -
xD

Standard Connections

These are connections which are common to all instruments in the range.
Recommended
PV Input (Measuring Input)
Minimum Spacing
C
C 10mm (0.4in) 1. Run input wires separate from power cables
D 38mm (1.5in)
2. When shielded cable is used, it should be grounded at one point only
D
3. Any external components (such as zener barriers, etc) connected between sensor and input terminals
(Not to scale)
may cause errors in measurement due to excessive and/or un-balanced line resistance or possible
leakage currents
3508 3504
4. This input is not isolated from logic I/O A and logic I/O B
Thermocouple or Pyrometer Input
•
Use the correct type of thermocouple compensating cable, preferably
+
V+ shielded, to extend wiring
•
- It is not recommended to connect two or more instruments to one
V-
thermocouple
RTD Input
•
The resistance of the three wires must be the same
VI
•
The line resistance may cause errors if it is greater than 22Ω
V+
Note 1: The RTD wiring is not the same as 2400 series instruments. It is the
same as 26/2700 series
V-
Note 2: For 2-wire this is a local link
Note 2
Linear Input V, mV and High Impedance V
•
mV range +40mV or +80mV
+80mV
•
V+
High level range 0 – 10V
0 – 2V
•
V-
High Impedance mid level range 0 – 2V. Used for zirconia probe oxygen input.
0 – 10V
•
A line resistance for voltage inputs may cause measurement errors
Linear Input mA
•
For mA input connect the 2.49Ω resistor supplied across the input terminals
V+ •
0 – 20mA
The resistor supplied is 1% accuracy 50ppm temperature coefficient
4 – 20mA
•
V-
A resistor 0.1% accuracy 15ppm resistor can be ordered as a separate item.
Part No. SUB35/ACCESS/249R.1
Built in Relay (AA)
•
Relay shown in de-energised state
AA
•
Isolated 240Vac
AB
•
Relay rating: Max: 264Vac 2A resistive; min: 1V, 1mAdc to provide sufficient
AC
03/09 whetting current.
Plug in I/O Module Connections (continued)
DC Control
Actuator
xA
0-20mA
or
xB
0-10Vdc
DC Retransmission
To other
controllers
xA
0-20mA
or xB
0-10Vdc
Triple Logic Input
Input 1 xA
Break out
Input 2 xB
tracks as
required to
xC
Input 3
disconnect
xD
the snubber Common
Triple Contact Input
Input 1
xA
External
Input 2
Switches
xB
or Relays Input 3
xC
xD
Common
Potentiometer Input
xA
+0.5V
xB
xC
xD
0V
Digital I/O
These terminals may be configured as logic inputs, contact inputs or logic outputs in any combination
It is possible to have one input and one output on either channel.
!
The Digital IO is not isolated from the PV input. The controller is designed to
operate normally if the input sensor is connected to 240Vac, but in this case these terminals will
be at this potential.
Logic Inputs
Input 1
LA
Input 2
LB
Common
LC
Digital (Logic) Outputs
Output 1
LA
Output 2
LB
Common
LC
The fixed digital logic outputs may be used to power remote 2 wire transmitters. The fixed digital
I/O are, however, not isolated from the PV input circuit, so this does not allow the use of 3 or 4 wire
transmitters. An isolated module must be used for the 3 and 4 wire types.
Digital (Logic) Outputs used to power a remote 2 wire transmitter.
Output 1 LA
Output 2 LB
V+
4- 20mA
V-
Digital (Logic) Output modules used to power remote 3 or 4 wire transmitters.
2.49Ω
V+
V-
4- 20mA
24V Transmitter Power Supply
•
+
Hardware Code: D4
Transmitter
•
Output Rating: (10Vdc, 20mA max)
-
Transducer Power Suppy
Transducer with Internal Calibration Resistor
Controller
•
+ Hardware Code: D6
10Vdc
•
Output Rating: (10Vdc, 20mA max)
power
-
supply
Internal
switch to
connect
Rcal
•
Hardware Code: TL
•
Input Ratings: Logic inputs <5V OFF >10.8V ON
Limits: -3V, +30V
V+
V-
Transducer with External Calibration Resistor
•
Hardware Code: TK Controller
•
Input Ratings: Logic inputs >28K OFF <100 ON 10Vdc
power
supply
Internal
switch to
connect
Rcal
•
Hardware Code: VU
•
Rating: 100Ω to 15KΩ
V+
V-
Contact Closure Inputs
•
•
Voltage level logic
Input 1 Contact open
LA
inputs, 12V, 5-40mA
>1200Ω
Input 2
LB
Active > 10.8V •
Contact closed
Inactive < 7.3V
Common
LC <480Ω
•
The logic outputs are capable of driving SSR or thyristors up to 9mA,
18V. It is possible to parallel the two outputs to supply 18mA, 18V.
2 Wire
The parallel logic outputs supply >20mA, 18V.
Transmitter
Connect the supplied load resistor equal to 2.49Ω for mA
input
2.49Ω
2.49Ω +
+
3 Wire
4 Wire
xA
Transmitter V+
-
Transmitter
-
xB
V-
4- 20mA
Isolated Transmitter Option Isolated Transmitter Option
module +24V >20mA module +24V >20mA
+ •
Hardware Code: MS
xA
•
-
Output Rating: 24Vdc 20mA
xB
•
Hardware Code: G3
•
Transducer
Rating: Configurable 5V
xA
or 10Vdc.
+
White
xB •
Minimum load resistance
-
R
CAL 300Ω
xC
B
xD
Red
Black V+
V-
A
Green
mV Input
C
Input if an analogue input module is used in
the appropriate slot.
D
Transducer
White
+
xA
-
xB
A
30.1KΩ
xC
Red
Black
V+
xD V-
B
Green
mV Input
.
xA
xB