![background image](http://html1.mh-extra.com/html/omron/ej1-ethercat/ej1-ethercat_user-manual_742375125.webp)
100
Detecting Current Errors
Section 4-5
■
HS Alarm Latch and Latch Cancel
The HS alarm latch can be used to keep an HS alarm ON once it goes ON.
The latch can be released by executing an operation command (Reset Error
or Software Reset), cycling the power, or setting the HS Alarm parameter to
100.0 A. Refer to
6-4-11 Operation Commands
for details on the operation
commands.
Note
This parameter can be set only when operation is stopped.
Installing Current
Transformers (CT)
(HS Alarm)
For details, refer to
Installing Current Transformers (CT) (HB Alarm)
on
page 93.
Calculating the Heater
Short Detection
Current Value
For details, refer to
Calculating the Heater Burnout Detection Current Value
on page 94.
4-5-4
Heater Overcurrent Alarm (OC Alarm)
A heater overcurrent is detected by measuring the heater current while the
control output (heating) is ON. For details, refer to the following table.
(Heater overcurrent detection cannot be used with the control output for cool-
ing.)
Note
(1) In the above diagram, it is considered normal if the heater current is less
than the heater overcurrent detection current. When an excessive current
flows in the heater, the current will exceed the heater overcurrent detec-
tion value and a heater OC Alarm will be output.
(2) Heater overcurrents are not detected if the control output (heating) ON
time is 100 ms or less. Detection is also sometimes not possible if a con-
tactor is used for the control output.
Variable type
Parameter name
Setting range Default
E4/A4
HS Alarm 1 or 2 Latch
(I/O) 0: Disabled
1: Enabled
0
Control output (heating)
Power to heater
OC alarm output
ON
Normal (See note 1.)
OFF
Heater overcurrent occurred
ON
Control output (heating)
ON
OFF
ON time
(See note 2.)
OFF time
Variable type
Parameter name
Setting/monitoring range Default
D6/96
(See note 3.)
Heater Overcurrent 1 or
2 Detection
(I/O)
0.0: OC Alarm ON
0.1 to 99.9 A
100.0: OC Alarm OFF
100.0
E4/A4
(See note 4.)
Heater Overcurrent 1 or
2 Hysteresis
(I/O)
0.1 to 100.0 A
0.1
C5/85
Heater Current Value 1 or
2 Monitor
(I/O)
0.0 to 110.0 A
---
Conditions for use
There must be a CT input.
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: ......