EH-150 series PLC
!
!
!
!
!
HITACHI
EH-RTD8
Resistance Temperature Detective
input module
Instruction manual
Thank you for purchasing a Hitachi Programmable Logic
Controller. To operate it safely, please read this instruction
manual and all the user manuals carefully. Please be sure to
use the latest versions of user manuals and keep them at hand
of end users for future reference.
Safety precautions
Definitions and Symbols
Indicates a potentially hazardous situation
DANGER
CAUTION
which, if not avoided, can result in serious
injury or death.
Indicates a potentially hazardous situation
which, if not avoided, can result in minor
to moderate injury, or serious damage of
product.
: Indicates Prohibition
Caution
1. All rights reserved.
2. The content of this manual may be changed without notice.
3. While efforts have been made on this manual to be
accurate, please contact us if any mistake or unclear part is
found.
Warranty period and coverage
The warranty period is within 18 months after manufacturing
date (MFG NO.) or 12 months after installation.
Examination and repair within the warranty period is covered.
However within the warranty period, the warranty will be
void if the fault is due to;
(1) Incorrect use from instructed in this manual and the
application manual.
(2) Malfunction or failure of external other devices than
this unit.
(3) Attempted repair by unauthorized personnel.
(4) Natural disasters.
The warranty is for the PLC only, any damage caused to third
party equipment by malfunction of the PLC is not covered by
the warranty.
Repair
Any examination or repair after the warranty period is not
covered. And within the warranty period any repair and
examination which results in information showing the fault
was caused by any of the items mentioned above, the repair
and examination cost are not covered. If you have any
questions regarding the warranty or repair cost, please contact
your supplier or the local Hitachi Distributor. (Depending on
failure part, repair might be impossible.)
Ordering spare parts and inquiries
Please contact your local suppliers for ordering products/spare
parts or any inquiries with providing the following
information.
(1) Product name
(2) Manufacturing number (MFG NO.)
(3) Details of failure
: Indicates Compulsion
- Do not touch terminals while power ON. There is a danger of
electric shock and/or injury.
- Be sure to install external safety devices outside of the PLC
like emergency stop circuit or interlock circuit.
- Be sure that the rated voltage matches the power supply
voltage of the unit. Otherwise, there is a danger of breakdown
and/or injury and/or fire.
- Only qualified personnel shall carry out wiring work.
Otherwise, there is a danger of breakdown and/or injury and/or
fire.
DANGER
CAUTION
COMPULSION
- Be sure to ground the unit. Otherwise, there is a danger of
electric shock and/or malfunction.
- Do not attempt to modify nor disassemble the unit. There is a
danger of breakdown and/or injury and/or fire.
PROHIBITION
Mounting
- Mount the PLC on a metal plate and install in a cabinet as
follows.
- Be sure to ground the cabinet and the metal plate, otherwise
there is a risk of malfunction.
- Install the PLC as described in user manual.
- Take appropriate measures when the PLC system installed in
locations:
Influenced easily due to noise or static electricity or other
forms of noise.
Under strong electromagnetic field.
Close to power supplies.
- Be sure to tighten mounting screws, terminal screws and
connector screws.
- Be sure to check that devices with lock mechanism, such as an
expansion cable or terminal blocks, are locked properly.
1 NJI-613 (X)
CPU
Earth leakage
Grounding
AC AC
Metal plate
Grounding
Power
supply
AC
Breaker
Enclosure
Basic Unit
Expansion Unit
Net filter
Figure 1 Power wiring example
Table 1 Specifications of the net filter
Insulation transformer (recommended)
Item Spec.
I/O Wiring
- Be sure that the input/output matches the specified voltage.
Otherwise, there is a danger of breakdown and/or fire.
- Use shielded cable for relay outputs modules, and connect
shields to a functional ground for one side or both sides
depending on applications.
- Route the AC power line and I/O lines separated as much as
possible. Do not route both cables in a same duct.
- Route the I/O lines and data lines as close as possible to the
grounded surfaces such as cabinet elements, metal bars and
cabinets panels.
- Refer to the following table.
Electric wire for wiring
Size Material
22-14 AWG Copper Single/twisted wire available
Type
Terminal
tightening
torque
9in. –1bs
(1.02 Nm)
Rated voltage (V AC) 250
Rated current (A) 5
Withstand voltage (V)
(between Terminal and case)
Insulation resistance (MΩ)
(500V DC, 1min., between terminal and case)
Attenuation characteristic
(dB)
0.5 to 30 MHz
0.15 to 30 MHz
1,500
100 (min.)
Common mode
more than 40dB
Differential mode
more than 40dB
Power Wiring
- Appropriate emergency circuitry, interlock circuitry and
similar safety measures should be added to the system.
- Appropriate safety measures should be included in the
system for unexpected breaking of wire or malsignal caused
from instantaneous power failure.
- Applied voltage must be in the range specified in the manual.
Otherwise, there is a danger of breakdown and/or injury
and/or fire.
- Install an external earth leakage breakers to avoid short
circuit accident.
- In case of the following operations, turn off power.
Otherwise, there is a danger of breakdown and/or injury
and/or fire.
Mounting or dismounting CPU and I/O modules.
Assembling cabinet or machine including PLC.
Wiring.
- Install net filter specified in Table 1 or similar. The input and
output cable of the net filter should be separated as much as
possible. Be sure to ground the net filter.
- A shielded and insulated transformer is recommended.
- The basic and expansion unit should be connected to
common power source and powered up together as shown in
Figure 1.
- To install an arrester in each power wire is recommended in
order to prevent lightning damage and/or injury.
Common precautions
- Use proper cable ferrules for terminals. Using improper cable
ferrules or connecting bare wires to terminals directly might
result in fire.
- Do not turn on power, if the unit appears damaged.
- Be sure to check all the field wiring before PLC power on.
Otherwise, there is a risk of fire.
- Do not attempt to disassemble, repair or modify any part of the
PLC.
- Do not pull on cables or bend cables beyond their natural limit.
Otherwise, there is a risk of breaking of wire.
- Keep PLC modules in their boxes during storage and transport.
- Check carefully your PLC program before operation.
Installation environment
Avoid the following locations to install the PLC.
- Excessive dusts, salty air, or conductive materials (iron
powder, etc.)
- Direct sunlight.
- Temperature less than 0○C or more than 55○C
- Humidity less than 5% or more than 95%.
- Dew condensation.
- Direct vibration or impact to the unit.
- Corrosive, explosive or combustible gases.
- Water, chemicals or oil splashing on the PLC.
- Close to noise emission devices.
Reference Manual
Read the following application manual carefully depends on
series to use the PLC safely and properly. Be sure to keep the
latest version.
Manual name Manual No.
EHV-CPU APPLICATION MANUAL
EHV-150 APPLICATION MANUAL
* The alphabet between 481 and (X) means version (A, B...) and
the space means the first edition.
NJI-481* (X)
NJI-281* (X)
2 NJI-613 (X)
Specifications
General specifications
Item Specifications
Operating ambient temperature
Storage ambient temperature
Operating ambient humidity 5 to 95 % RH (no condensation)
Storage ambient humidity 5 to 95 % RH (no condensation)
Vibration resistance Conforms to IEC 60068-2-6
Noise resistance ○ Noise voltage 1,500 Vpp Noise pulse width 100 ns, 1µs
(Noise created by the noise simulator is applied across the power supply module’s input terminals. This is
determined by this company’s measuring method.)
○ Based on IEC61131-2
○ Static noise: 3,000 V at metal exposed area
Insulation resistance 20 MΩ or more between the AC external terminal and case ground (FE) terminal (based on 500 V DC)
Dielectric withstand voltage 1,500 V AC for 1 minute between the AC external terminal and case ground (FE) terminal
Grounding Class D grounding (ground with power supply module)
Usage environment No corrosive gases, no excessive dust
Structure Open, wall-mount type
Cooling Natural air cooling
Performance specification
Item Specification
Type EH-RTD8
Supported RTD type PT100 / PT1000 (3-wire or 2-wire)
Number of channel
Selectable by the DIP switch
Temperature range
Selectable by the DIP switch
○
Resolution
Selectable by the DIP switch
Conversion time
Selectable by the DIP switch
Accuracy *1
Measurement current 0.18mA
Diagnostic error LED LED blinking at error channel
(Wire breaking detection) Conversion value H7FFF
Input filter
Selectable by the DIP switch
Warm-up time *3 1 minute
Isolation Channel to internal circuit Photo coupler
Between channels Not isolated
Weight Approximately 0.15 kg
External wiring Removable terminal (M3)
Internal current consumption (5 V DC) Max. 300mA
External power None
Wiring Twisted shield cable, wiring resistance Max. 5Ω (Max. 100m of 22AWG)
I/O assignment Selectable by the DIP switch X8W or X4W (PT4 compatible mode)
Standard accuracy (25○C)
Temperature coefficient ±0.01% / ○C (FS)*2 (±0.1°C / °C )
*1 Example : Measuring under 380°C in ambient temperature 35°C.(under noise-free environment)
0.5°C (standard accuracy) + 0.1°C/°C (temperature coefficient) × 10 (difference to 25°C) = ±1.5°C
*2 Full scale is -200 to 850°C.
*3 It is the time for data to be stable after power on.
C conversion
-200 to 850○C : 0.1°C -328 to 1562○F : 0.1○F -60 to 410○C : 15 bits
-40 to 60○C : 0.02°C
Max. ±0.5°C (measured temperature under 380°C)
Max. ±0.8°C (measured temperature over 380°C)
0 to 55°C
-10 to 75°C
6 (3-wire) or 8 (2-wire)
-200 to 850°C or -40 to 60°C
○
F conversion PT4 compatible
－ -25 to 45
1.6s (all channels) or 0.5s (all channels)
None or moving average 16 times
○
C : 15 bits
3 NJI-613 (X)
Loading...