26
• If the TS 2 HIGH LIMIT CUTOUT feature is enabled, then the HIGH TS 2 ALARM temperature set-
ting 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 mea-
surements.
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).
Notes:
• If an alternate voltage source is selected, then all voltage alarming features are disabled for
this
HTC and the VOLTAGE TURNS RATIO is not used.
• It is not possible to set both points to use the others’ voltage source.
3.5.20 FIXED VOLTAGE SETTING (V3.11 AND UP)
(Only if
VOLTAGE SOURCE = FIXED)
Purpose: This parameter specifies the voltage value that the HTC should use when the VOLTAGE
SOURCE = FIXED
.
Range: 0 to 1000 Volts
Procedure: Adjust the
FIXED VOLTAGE setting to the desired level.
Note: All voltage alarming features are disabled for this HTC and the VOLTAGE TURNS RATIO is not
used when the
VOLTAGE SOURCE is set to FIXED.
3.5.21 VOLTAGE TURNS RATIO ADJUSTMENT
Purpose: The
VOLTAGE TURNS RATIO adjusts voltage readings for applications where a controller
is switching a load through a step-up or step-down transformer, or is being powered from a
source with a different voltage level than the trace voltage.
Range: 0.10 to 9.90 (TO 1)
Procedure: Adjust the
VOLTAGE TURNS RATIO to equal the ratio of the circuit voltage to the con-
troller input voltage. Compare the indicated voltage to the measured voltage after setting the
turns ratio and adjust until the two readings are as close as possible.
e.g.: Heating Circuit Voltage: 480 Volts
Module Input Voltage: 120 Volts
VOLTAGE TURNS RATIO Setting: 4.00
Notes:
• When the
VOLTAGE TURNS RATIO has been set appropriately, the HTC will calculate the circuit
power using the adjusted current and voltage readings. Voltage alarms also use the adjusted
circuit voltages.
• The
VOLTAGE TURNS RATIO is not used if the selected VOLTAGE SOURCE is not from the dedi-
cated switch interface.
3.5.22 CURRENT TURNS RATIO ADJUSTMENT
Purpose: The
CURRENT TURNS RATIO adjusts current readings for applications where a controller
is monitoring a load through an external step-up or step-down current transformer.
Range: 0.10 to 60.00 (TO 1)
Procedure: Adjust the
CURRENT TURNS RATIO to equal the ratio of the primary to secondary
windings of the external current transformer. Compare the indicated current to the measured
current after setting of the
CURRENT TURNS RATIO and adjust until the two readings are as close
as possible.
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