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The front panel displayed is referred to as the "Home or Run" Screen.
Overview: Front Panel displays, and indicators.
1: CH1 & CH2 Inc/Dec LED's. Indicate "ON/OFF" Time Proportioned output.
INC, up arrow (heat, humidify, climb, etc.) and DEC, down arrow (Cool, de-humidify, dive, etc.)
2: Displays Program # (1 – 99), Step # (1 – 200), and Time Remaining in current program step.
3: Displays Interface, LCL (Local, front panel) or RMT (Remote, external computer) and Mode
(RUN, STP, EOP, GS1, GS2, etc.)
4: Line 1: Displays CH1 & CH2 SP (Setpoint) and status of first eight event outputs (1 – 8)
Line 2: Displays CH1 & CH2 PV (Process value) and status of next eight event outputs (A – H)
(SP and PV are displayed in units configured for that channel (deg C, F, %RH, Alt/FT etc.)
5: ALM – 4 possible flashing displays: S1 – S2 – L1 – L2.
S1 & S2 – Setpoint Alarm. Setpoint is out of configured controller span or input is open.
CH1 or CH2 PV will display "RANGE" setpoint out of range or "P.OP" – Probe Open.
L1 & L2 – DEV Limit Alarm. Channel is out of programmed +/- DEV span.
Each channel can be configured for the program to continue running or stop during alarm,
and for the alarm display and output to reset manually or automatically.
CH1 & CH2 share a common Logic low output from the 620A.
Model 620A by TMC Services Training
By Compass Services
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