Extech Instruments 96VTR Instruction Manual page 7

8. THIRD PROGRAMMING LEVEL PARAMETERS
Press and hold the SCROLL and RETURN keys simultaneously for 5 seconds to enter
this level from the previous programming level. To return to normal operation at any
time, press the RETURN key.
rEmo: Remote/Local toggle parameter. Set to "0" for local mode or "1" for optional
RS-485 PC communications remote mode. In remote mode, the controller's
keypad is inactive and only a connected PC can change the controller's
parameters. In local mode the controller's keypad is active.
P-L: Parameter Lock. This security feature locks out selected programming levels
prohibiting tampering and inadvertent programming changes. Depending upon
its setting, only certain parameters will display, refer to the list below.
Allowable setting range: 0 to 15;
0 - All parameters displayed are adjustable (level 1 parameters: A1SP, A2SP)
1 - Same as '0'(level 1 parameters displayed: Ramp, A1SP, A2SP)
2 - Same as '0'(level 1 parameters displayed: oPoF, A1SP, A2SP)
3 - Same as '0'(level 1 parameters displayed: Ramp, oPoF, A1SP, A2SP)
4 - same as '0', w/level 4 locked
5 - same as '1', w/level 4 locked
6 - same as '2', w/level 4 locked
7 - same as '3', w/level 4 locked
8 - same as '0', w/levels 3, 4 locked
9 - same as '1', w/levels 3, 4 locked
A1Fu: Alarm 1 Function. Select an Alarm / Timer function from the function list in
Appendix A.
A2Fu: Alarm 2 Function. Select an Alarm function from the alarm functions list in
Appendix A.
A1HY: Hysteresis for Alarm 1. The Setting range is 0.0 to 25.5% of the controller's span
settings. The controller's Span extends from the value programmed in 'LoLt' to
the value programmed in the 'HiLt' parameter (Low and High Limits). Hysteresis
is used to eliminate relay "chatter" by creating a deadband that extends from the
alarm setpoint down or up (depending upon the alarm type) where no relay
action can occur. The larger the hysteresis value the less the possibility of relay
chatter.
A2HY: Same as A1HY except for Alarm 2.
Act: Primary Output (Output 1) control action. Set to "0" for cooling (direct) action or "1"
for heating (reverse) action. Secondary Output (Output 2) is automatically
configured as a cooling output.
unit: Unit of measure selection. Program as follows:
Set to '0' for degrees F
Set to '1' for degrees C
Set to '2' for analog inputs
dP: Decimal Point selection.
Set to '00' for no decimal point
Set to '01' for 0.1 resolution
Set to '02' for 0.01 resolution (cannot use this setting for temperature inputs)
Set to '03' for 0.001 resolution (cannot use this setting for temperature inputs)
Ct: Primary Control Output 1 Cycle Time. Range: 0 to 100 seconds. This is the rate at
which the controller makes automatic output adjustments. The longer the time,
10 - same as '2', but levels 3, 4 locked
11 - same as '3', but levels 3, 4 locked
12 - same as '0', but levels 2, 3, 4 locked
13 - same as '1', but levels 2, 3, 4 locked
14 - same as '2', but levels 2, 3, 4 locked
15 - same as '3', but levels 2, 3, 4 locked
7 96VTR Ver. 2.0 11/99