IMR01M01-E16
21
How alarm is checked
If the alarm occurs, the relevant error number is shown on the display unit. Therefore in this case, check the alarm contents.
Error number Description
128 Heater break alarm 1
256 Thyristor break-down
512 Heater break alarm 2 (heater deterioration)
For the Error display, refer to the 8. ERROR OR ALARM DISPLAY (P. 26).
(2) Type 2
Type 2 corresponds to a Heater break alarm when one heater is used. (Refer to Application)
The Heater break alarm of Type 2 is used for heat generation substances such as noble metals making large resistance
change with temperature variations.
No type 2 can be used when two or more heaters are used in parallel connection.
How alarm is activated
• When heater current does not flow (Heater break, malfunction of the control device, etc.)
When the phase angle is equal to or more than 15 % and the current transformer input value is equal to or less than the
Heater break alarm set value for the preset number of consecutive sampling cycles, an alarm status is produced.
However, in order to prevent malfunctioning, it is so designed that no Heater break alarm occurs at an phase
angle of less than 15 % (less than 15 % of maximum load current).
• When heater current can not be turned off (Thyristor break-down or permanent damage)
When the phase angle is 0 % and the current transformer input value is equal to or greater than the Heater break alarm set
value for the preset number of consecutive sampling cycles, an alarm status is produced.
The alarm will be turned off when the current transformer input value goes in and stays at non-alarm range for five
consecutive cycles.
Application
Refer to the figure below for action by setting the set values for the following parameters:
• Maximum load current set value for alarm (P)
1
: 20 A • Alarm output selection (T): 0: Heater break alarm 1
• Heater break alarm 1 set value setting (q): 10 % • Heater break alarm 2 set value setting (F)
2
: 0: Heater break alarm 2 unused
• Number of alarm delay times (r): 0 times • Heater break alarm 2 used/unused (K)
3
: 0: Unused
• Heater break alarm type (n): 1: Type 2 • Alarm output state selection (c): 0: ON at alarm output
1
Always set the maximum heater current value.
2
Always set the Heater break alarm 2 to “0: Heater break alarm 2 unused.”
3
Always set the Heater break alarm 2 used/unused to “0: Unused.”
For details of heater break alarm, refer to the separate Setting Method of Heater Break Alarm (IMR01M05-E).
Heater break alarm 1 set value
= (Maximum load current set value) × (Heater break alarm 1 set value)
= 20 A × 10 % = 2 A Heater break alarm 1 set value 2 A
Set the Heater break alarm 1 set value to approximately 10 % of the maximum load current value. Do not set
the Heater break alarm set value to more than 15 %.
How alarm is checked
If the alarm occurs, the relevant error number is shown on the display unit. Therefore in this case, check the alarm contents.
Error number Description
128 Heater break alarm 1
256 Thyristor break-down
For the Error display, refer to the 8. ERROR OR ALAMR DISPLAY (P. 26).
Alarm range of Heater break alarm
(Thyristor break-down)
When the phase angle is 0 % and the
current transformer input value is equal
to or greater than the Heater break
alarm set value for the preset number o
consecutive sampling cycles, an alarm
status is produced.
14.9 %
Current (A)
(When the maximum load current value is set to 20 A)
Heater break alarm 1 set value 10 % (2 A)
Phase angle (%)
100 % 0
No Heater break alarm occurs if within this range.
However, the alarm occurs in the case of thyristor break-down.
larm range of Heater break alarm
When the phase angle is equal to or
more than 15% and the current
transformer input value is equal to or
less than the Heater break alarm set
value for the preset number of
consecutive sampling cycles, an alarm
status is produced.
Error display
E.1.2.8.
Error display
E.1.2.8.
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