Tyco DigiTrace 920 Series - 3.5.15 TS 1 HIGH LIMIT CUTOUT; 3.5.18 TS 2 HIGH LIMIT CUTOUT

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Purpose: This parameter specifies the lead resistance of a 2-wire nickel-iron RTD connected to
the
HTC’s TS 1 input.
Range: 0 to 20.00 Ω
Procedure: Measure the resistance of one of the nickel-iron
RTD leads (from the RTD to the HTC’s
TS 1
input) and use this value as the TS 1 LEAD RESISTANCE.
3.5.15 TS 1 HIGH LIMIT CUTOUT
Purpose: When enabled, the
TS 1 HIGH LIMIT CUTOUT feature will override the CONTROL SETPOINT
temperature and force the controller output off if the
TS 1 reading exceeds the HIGH TS 1 ALARM
temperature setting. This is a non-latching condition, so once the
TS 1 reading drops below the
HIGH TS 1 ALARM temperature setting, the controller will resume normal operation.
Setting: ENABLE or DISABLE
Procedure: Enable or disable the cutout feature as desired.
Notes:
• The
TS 1 HIGH LIMIT CUTOUT feature overrides an autocycle test. A pending autocycle will be
initiated immediately after the
TS 1 temperature drops below the HIGH TS 1 ALARM tempera-
ture setting.
•If a
TS 1 failure occurs and the TS 1 HIGH LIMIT CUTOUT feature is enabled, the switch output
will latch off regardless of the
TS CONTROL MODE setting or the TS FAIL MODE setting.
• If the
TS 1 HIGH LIMIT CUTOUT feature is enabled, then the HIGH TS 1 ALARM temperature set-
ting can be set, regardless of whether the
HIGH TS 1 ALARM is enabled.
3.5.16 TS 2 TYPE (V3.11 AND UP)
Purpose: This parameter specifies the type of
RTD that is connected to the HTC’s TS 2 input.
Setting: 3-wire 100 Ω platinum or 2- (or 3-) wire 100 Ω nickel-iron (Ni-Fe)
Procedure: Select the type of RTD that is connected to the TS 2 input.
Note: If a 2-wire 100 Ω nickel-iron (Ni-Fe) RTD is selected then the TS 2 LEAD RESISTANCE must
be entered (see section 3.5.17 on page 25).
3.5.17 TS 2 LEAD RESISTANCE (V3.11 AND UP)
(For Ni-Fe
RTDs only)
Purpose: This parameter specifies the lead resistance of a 2-wire nickel-iron
RTD connected to
the
HTC’s TS 2 input.
Range: 0 to 20.00 Ω
Procedure: Measure the resistance of one of the nickel-iron RTD leads (from the RTD to the HTC’s
TS 2 input) and use this value as the TS 2 LEAD RESISTANCE.
3.5.18 TS 2 HIGH LIMIT CUTOUT
Purpose: When enabled, the
TS 2 HIGH LIMIT CUTOUT feature will override the CONTROL SETPOINT
temperature and force the controller output off if the
TS 2 reading exceeds the HIGH TS 2 ALARM
temperature setting. This is a non-latching condition, so once the
TS 2 reading drops below the
HIGH TS 2 ALARM temperature setting, the controller will resume normal operation.
Setting: ENABLE or DISABLE
Procedure: Enable or disable the cutout feature as desired.
Notes:
• The
TS 2 HIGH LIMIT CUTOUT feature overrides an autocycle test. A pending autocycle will be
initiated immediately after the
TS 2 temperature drops below the HIGH TS 2 ALARM tempera-
ture setting.
•If a
TS 2 failure occurs and the TS 2 HIGH LIMIT CUTOUT feature is enabled, the switch output
will latch off regardless of the
TS CONTROL MODE setting or the TS FAIL MODE setting.