User guide

Publication 900-UM007D-EN-E - January 2011
Parameter Functions & Definitions 5-89
Heater Short Alarm (HSA) Latch
(900-TC8, 900-TC16)
Conditions of Use: Heater Burnout (HBA), Heater Short Alarms (HSA), and
heater overcurrent detection must be supported. Alarm 1 must be assigned.
The HS Alarm parameter must be set to ON. Optional controller hardware
and/or support hardware (e.g., CTs) must be installed.
Function: When the Alarm Latch parameter is set to ON, the HS alarm is
held until either of the following conditions is satisfied:
• The HS alarm current is set to 50.0 A.
• The controller power is turned OFF then back ON again (e.g., power is
reset).
• The latch id canceled by the PF key (900-TC8 only). PF Setting = LAT:
Alarm Latch Cancel.
• The latch is canceled by an event input (event input assignment 1 and 2
= LAT: Alarm Latch Cancel).
Note: The Alarm output is also turned OFF when switching to the Initial
Setting function group, Communications Setting function group,
Advanced Setting function group, or Calibration function group.
Related Parameter
• HS Alarm Use (Advanced Setting function group, page 5-88)
• Event Input Assignment 1 and 2 (Initial Setting function group, page
5-66)
• HB ON/OFF, PF Settings (Advanced Setting function group, page
5-74)
Heater Short Alarm (HSA) Hysteresis
(900-TC8, 900-TC16)
Conditions of Use: Heater Burnout (HBA) and Heater Short Alarms (HSA)
must be supported. Alarm 1 must be assigned. The HSA parameter must be
set to ON. The HS Alarm Latch must be set to OFF. Optional controller
hardware and/or support hardware (e.g., CTs) must be installed.
Table 5.DF
Selections Default
on: Enabled, off: Disabled off
hsl
hsh