Mitsubishi Electric MELSEC iQ-R Series User Manual page 91

■Restrictions
• When only one channel has been used, the heater disconnection correction function does not work. To use this function,
two or more channels have to be used.
• When multiple channels have been used with a heater that is ON in one channel and heaters that are OFF in the other
channels, the heater disconnection correction function does not work. Thus, disconnections may be detected even though
there is no disconnection.
• The heater disconnection alert correction value can be 20% at maximum. When the heater disconnection alert setting value
has been set to 80% as shown in the above two examples and if a voltage drops by 40% or more, the disconnection
detection conditions are satisfied and a heater disconnection is detected even after the correction value of 20% has been
applied.
■Setting method
Set the following item to "ON."
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Heater disconnection detection setting]
 [Heater disconnection correction function selection]
■Clearing the disconnection detection status
Detected disconnections are disabled by restoring the disconnection status and CH1 Heater disconnection detection
(Un\G401, b12) turns from ON to OFF.
The timing of when a heater turns ON differs depending on the settings of the following buffer memory areas:
• "Control output cycle setting" of "Control basic parameters" in "Application Setting"
• "Cooling control output cycle setting" of "Heating/cooling control setting" in "Application Setting"
1 FUNCTIONS
1.27 Heater Disconnection Detection Function
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