Pentair 920 Series Installation, Operating And Maintenance Instructions page 24

INDUSTRIAL HEAT TRACING SOLUTIONS
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.
Important:
• The TS 1 HIGH LIMIT CUTOUT feature overrides an autocycle test. A pending autocycle will
be initiated immediately after the TS 1 tempera-ture drops below the HIGH TS 1 ALARM
temperature 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
setting 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.
Important: 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.
Important:
• The TS 2 HIGH LIMIT CUTOUT feature overrides an autocycle test. A pending autocycle will
be initiated immediately after the TS 2 tempera-ture drops below the HIGH TS 2 ALARM
temperature 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.
• If the TS 2 HIGH LIMIT CUTOUT feature is enabled, then the HIGH TS 2 ALARM temperature
setting can be set, regardless of whether the HIGH TS 2 ALARM is enabled.
3.5.19 voLtaGe sourCe (v3.11 and up)
purpose: This parameter specifies which voltage source the HTC should use for its voltage
measurements.
setting: POINT A or POINT B or FIXED
Procedure: If the HTC is not powered from a dedicated switch interface an alternate voltage source
can be selected. If a fixed constant voltage value is to be used then that FIXED VOLTAGE SETTING
must also be entered (see section 3.5.20 on page 26).
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