Temperature Sensor Alarms Configuration - nvent 910 Series Installation, Operating And Maintenance Instructions

5.4 TEMPERATURE SENSOR ALARMS CONFIGURATION

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• If multiple alarm outputs from different controllers are wired in series (i.e.: multi-point
panels), set this parameter to NO (steady).
5.3.5 ALARM OUTPUT NORMAL STATE
Purpose: Configures both the alarm output relays (dry contact and AC alarm) for normally
open or normally closed operation. The normal condition is assumed to be when the HTC is
powered and no alarms exist.
Setting: N.O. (Normally Open) or N.C. (Normally Closed)
Procedure: Set the alarm output relays to normally open or normally closed to suit the
application.
IMPORTANT: If a pilot light is used for indication of alarms, normally closed operation
provides a steady illumination of the lamp when the circuit is operating correctly. A light that is
flashing or out indicates a fault condition. A burned out lamp is readily identified if the HTC is
set to flash the dry contact alarm output relay and the AC Alarm Relay output in case of alarm.
See the Section 5.3.4.
5.3.6 LANGUAGE
Purpose: Defines which language the Operator Console is to use when prompting the user for
input and/or displaying messages and status.
Setting: ENGLISH or FRANCAIS
Procedure: Select the language of choice: ENGLISH for English prompts and messages, or
FRANCAIS for French prompts and messages.
5.3.7 PASSCODE
See Section 5.7.1.
5.3.8 SCROLL DELAY SETTING
Purpose: Allows the user to modify the speed at which information is scrolled on the Operator
Console for ease of viewing.
Range: 0.07 to 0.25 seconds
Procedure: Decreasing the scroll delay value will cause the information on the display to scroll
by faster. Increasing the scroll delay value will cause the information on the display to scroll by
slower.
This section defines the temperature related alarming functions of the 910 controller.
5.4.1 TEMPERATURE SENSOR 1 FAILURE ALARM
Purpose: Enabling TS 1 FAILURE will provide indication of an open or shorted failure of TS 1.
Alarm Mask: ENABLE or DISABLE
Procedure: Enable or disable alarming of a failed temperature sensor connected to the TS 1
input as required.
IMPORTANT:
• This failure alarm should be enabled if a temperature sensor is connected to the TS 1 input.
• This alarm is always latched and must be reset by the user.
5.4.2 LOW TEMPERATURE SENSOR 1 ALARM
Purpose: If enabled, the LOW TS 1 ALARM allows for alarming of low temperature conditions
as sensed by the first temperature sensor (TS 1).
Alarm Mask: ENABLE or DISABLE
Range: –76°F to 1058°F (–60°C to 570°C)
Procedure: Adjust the LOW TS 1 ALARM temperature setpoint to the desired value. Note that
the LOW TS 1 ALARM must be enabled in order to adjust the LOW TS 1 ALARM
temperature setpoint.