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4 Basic Operation
E5@C-T Digital Temperature Controllers User’s Manual (H185)
4-12 Using Heater Burnout (HB) and Heater Short (HS) Alarms (Not
Supported for Position-proportional Models.)
4
4-12-2 HS Alarm
z Parameters
In the above diagram, power is considered to be OFF (normal) if the leakage current is less than
hs1 or hs2 (heater short detection current) during the Toff interval. The HS alarm will be OFF in this
case. If the leakage current is greater than hs1 or hs2 (heater short detection current) during the
Toff interval, the HS alarm will turn ON. Heater short are not detected if the OFF time (Toff) for the
control output for heating is 100 ms or less (35 ms or less if the control period is 0.1 or 0.2 s). Heater
shorts are not detected in the following cases.
• Control will be continued even when there is an HS alarm.
• The rated current may sometimes differ slightly from the actual current flowing to the heater. Use
the Leakage Current 1 Value Monitor and Leakage Current 2 Value Monitor parameters to check
the leakage current during actual operation
Parameter No. 1 display Value No. 2 display Level
HS Alarm Use hsu OFF or ON
(default: ON)
off, on Advanced Function
Setting Level
HS Alarm Latch hsl OFF or ON
(default: OFF)
off, on
HS Alarm Hysteresis hsh 0.1 to 50.0 A
(default: 0.1 A)
0.1 to 50.0
HS Alarm 1 or 2 (alarm
current)
hs1
hs2
0.0 to 50.0 A
(default: 50.0 A)
0.0 to 50.0 Adjustment Level
Leakage Current 1 or
2 Monitor
lcr1
lcr2
0.0 to 55.0 A 0.0 to 55.0
Auxiliary Output 1 to 4
Assignment
sub1 to sub4 HS: HS alarm or
HA: Heater alarm
hs or ha Advanced Function
Setting Level
Set the HS Alarm Use parameter to ON in the Advanced Function Set-
ting Level and set the HS Alarm 1 parameter in the Adjustment Level.
This procedure sets the HS Alarm 1 parameter to 2.5.
Operating Procedure
• Setting the HS Alarm Use Parameter
1
Press the M Key several times in the Advanced Function Set-
ting Level to display hsu (HS Alarm Use).
Advanced Function Setting
Level
2
Check to see if the set value is on (enabled, default).
Control output (heating)
OFF
ON
Ton
Toff
HS Alarm Use
on
hsu
on
hsu
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