93
Detecting Current Errors
Section 4-5
Installing Current
Transformers (CT)
(HB Alarm)
Connect the CT in advance to terminals A8 and A9 (CT1) or A7 and A9 (CT2),
and pass the heater power line through the CT's hole. Refer to
Current Trans-
former
on page 230 for details on compatible CT specifications, models, and
dimensions.
1.
Single-phase Heaters
Install the CT as shown below.
2.
Three-phase Heaters
Two CTs are required when using a three-phase power supply, regardless
of the type of wiring.
a.
Delta Connection: Refer to the following diagram for CT installation po-
sitions.
Note
Heater voltage fluctuations are not considered here, so take that
into account when setting the detection current.
b.
Star Connection: Refer to the following diagram for CT installation po-
sitions.
Note
Heater voltage fluctuations are not considered here, so take that
into account when setting the detection current.
c.
V Connection: Refer to the following diagram for CT installation posi-
tions.
Note
Heater voltage fluctuations are not considered here, so take that
into account when setting the detection current.
CT
To CT input
AC line
Load
Load: Heater (example)
CT
To CT input
AC line
Load: Heater (example)
To CT input
AC line
Load
Load
Load
CT
CT
To CT input
Load: Heater (example)
To CT input
AC line
Load
Load
Load
CT
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......