Q7750A-2003 Honeywell Power module Brand new

Lower Display

Prompt

Upper Display

Range of Setting or Selection

Parameter Definition

MINorRPM RESET UNITS — selects units of minutes or repeat per 

minutes for the I term of the PID algorithm. 20 Repeats 

per Minute = 0.05 Minutes per Repeat.

RPM REPEATS PER MINUTE — the number of times per 

minute that the proportional action is repeated by reset.

MIN MINUTES PER REPEAT — the time between each 

repeat of the proportional action by reset.

CONT1ALG The CONTROL ALGORITHM lets you select the type of 

control that is best for your process.

ATTENTION

If the recorder has two controllers 

(both enabled), CONT1ALG applies for controller #1 

and CONT2ALG applies for controller #2.

ON-OFF ON/OFF is the simplest control type. The output can be 

either ON (100%) or OFF (0%). The Process Variable 

(PV) is compared with the setpoint (SP) to determine 

the sign of the error (ERROR = PV-SP). The ON/OFF 

algorithm operates on the sign of the error signal.

· In Direct Acting Control, when the error signal is 

positive, the output is 100%; and when the error 

signal is negative, the output is 0%. If the control 

action is reverse, the opposite is true. An adjustable 

overlap (Hysteresis Band) is provided between the on 

and off states.

· Other prompts affected: “OUT HYST”

DUPLEX ON/OFF is an extension of this algorithm 

when the output is configured for Duplex. It allows the 

operation of a second ON/OFF output. There is a 

deadband between the operating ranges of the two 

inputs and an adjustable overlap (hysteresis) of the on 

and off states of each output. Both Deadband and 

Hysteresis are separately adjustable. With no relay 

action the controller will read 50%.

· Other prompts affected: “OUT HYST” and 

“DEADBAND”