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Detecting SSR Short Circuits (4-channel Models Only)
SSR Short-circuit
Detection Timing
Note
Operating Conditions
Calculating the Detection Current for SSR Short-circuits
SSR short-circuit
detection value
Heater OFF current
Status (SSR short-circuit bit)
ERROR indicator
Alarm output
Set value
Channels 1 to 4:
0 to 50 (See note 1.)
SSR short-circuit
detection value
Hysteresis
1 to 10
(See note 2.)
(1) SSR short-circuits will not be detected if the detection value is set to 50.
Detection status will be forced ON if the detection value is set to 0. Use
these to check operation during installation.
(2) Hysteresis is used to prevent chattering at the detection point. The same
hysteresis setting is used for all heater burnout detection, heater overcur-
rent detection, and SSR short-circuit detection functions.
• The actual current flowing in the heater may not be the same as the
heater's rated current. Check the heater current under actually conditions
using the Heater OFF Current parameters for channels 1 to 4.
• SSR short-circuit detection status can be confirmed by reading the status
for individual channels.
Set the detection current to the value calculated with the following formula or
higher.
Set value > Normal leakage current x 2
Hysteresis
Setting range
50 (disabled)
1
Section 4-6
ON
OFF
Default
29
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