Heater Current Monitoring; Reload Default Values - Brainchild BTC-2500 User Manual

3 25 Heater Current Monitoring

3 25 Heater Current Monitoring
A current transformer, CT94-1, should be equipped to measure the heater A current transformer, CT94-1, should be equipped to measure the heater
current. Select CT for IN2. The input 2 signal conditioner measures the heater current. Select CT for IN2. The input 2 signal conditioner measures the heater
current during the heater is powered and the current value will remain current during the heater is powered and the current value will remain
unchanged during the heater is unpowered. The PV2 will indicate the heater unchanged during the heater is unpowered. The PV2 will indicate the heater
current. About how to read PV2 value, please refer to section 3-24. current. About how to read PV2 value, please refer to section 3-24.
NOTES
If the heater to be measured is controlled by output 1, then CYC1 should If the heater to be measured is controlled by output 1, then CYC1 should
select 1 second or longer and O1TY should use RELY, SSRD or SSR . Similarly, select 1 second or longer and O1TY should use RELY, SSRD or SSR . Similarly,
if the heater to be measured is controlled by output 2, then CYC2 should if the heater to be measured is controlled by output 2, then CYC2 should
select 1 second or longer and O2TY should use RELY, SSRD or SSR to select 1 second or longer and O2TY should use RELY, SSRD or SSR to
provide an adequate time for A to D converter to measure the signal. provide an adequate time for A to D converter to measure the signal.
Since CT94-1 can detect a full-wave AC current only, a DC or half-wave AC Since CT94-1 can detect a full-wave AC current only, a DC or half-wave AC
can't be measured. can't be measured.

3 26 Reload Default Values

3 26 Reload Default Values
The default values listed in Table 1.4 are stored in the memory as the product The default values listed in Table 1.4 are stored in the memory as the product
leaves the factory. In certain occasions it is desirable to retain these values leaves the factory. In certain occasions it is desirable to retain these values
after the parameter values have been changed. Here is a convenient tool to after the parameter values have been changed. Here is a convenient tool to
reload the default values. reload the default values.
Operation
Press Press several times until several times until
show show .Use up-down key to select 0 to 1. If C unit is required, select 0 .Use up-down key to select 0 to 1. If C unit is required, select 0
B B
for FILE and if F unit is required, select 1 for FILE. Then Press for FILE and if F unit is required, select 1 for FILE. Then Press
seconds. The display will flash a moment and the default values are reloaded. seconds. The display will flash a moment and the default values are reloaded.
CAUTION
The procedures mentioned above will change the previous setup data. Before The procedures mentioned above will change the previous setup data. Before
doing so, make sure that if it is really required. doing so, make sure that if it is really required.
. Then press . Then press . The upper display will . The upper display will
B B
UM25001C
Accessory Installed: Accessory Installed:
CT94-1 CT94-1
Setup Setup
IN2=CT IN2=CT
O1TY or O2TY=RELY, SSRD or SSR O1TY or O2TY=RELY, SSRD or SSR
CYC1 or CYC2 >1 sec CYC1 or CYC2 >1 sec
Limitations Limitations
1. Linear output type can't be used. 1. Linear output type can't be used.
2. CYC1 ( or CYC2 ) should select 1 2. CYC1 ( or CYC2 ) should select 1
second or longer to detect heater second or longer to detect heater
current reliably. current reliably.
3. Only full-wave AC current can be 3. Only full-wave AC current can be
detected. detected.
FILE 0 FILE 0
B B
C Default File C Default File
for at least 3 for at least 3
FILE 1 FILE 1
B B
F Default File F Default File
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