Hengstler Grado 921 Manual Lawn
Grado 901 - 1/16-DIN PROCESS CONTROLLER CONCISE PRODUCT MANUAL (59222-4) OPERATING MODE NOTE: Set all Configuration Mode parameters and Set Up Mode parameters as desired before starting normal operations. Single Setpoint Operation Dual Setpoint Operation Adjusting Setpoint and Setpoint Ramp Rate Select the display (see above) and then use the Raise and Lower keys to change the displayed value. NOTE: In Setpoint Strategy 2, the initial display allows setpoint adjustment.
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Alarm Indication and Status Display When any alarm is active, the ALM indicator will flash and the Alarm Status display may be accessed as follows: Error/Fault Indications These displays appear only if setpoint ramping is not disabled. The Ramping SP value cannot be adjusted and only appears if SP Ramp Rate is not zero.
SP Ramp Rate is entered in eng units per hour. The displays only appear if setpoint ramping is not disabled. The Ramping SP value is not adjustable and only appears if SP Ramp Rate is not zero. SP Ramp Rate is entered in eng units per hour. Manual Control ( = 1 - See SET UP MODE) To select/de-select manual control, press the Auto/Manual key (see right). The SET indicator will flash continuously in Manual Control mode. The Raise/Lower keys may then be used to adjust the output power.
Pre-Tune and Self-Tune Pre-Tune sets the Controllers PID parameters approximately; Self-Tune may then be used to optimise the tuning. To engage: With Controller showing a normal Operator Mode display: HOLD KEYS DOWN UNTIL or For Pre-Tune For Self-Tune To dis-engage: Use same key sequence: NOTE: Pre-Tune will not engage (a) if the setpoint is ramping, (b) if the process variable is within 5% of input span of the setpoint or (c) if the proportional band = 0. It is a single-shot routine and is thus self-disengaging. If = 1 (Auto Pre-Tune enabled - see SET UP MODE), Pre-Tune will run for every power-up.
SET UP MODE (SET Indicator ON) NOTE: Set all Configuration Mode parameters as desired before adjusting Set Up Mode parameters. Entry/Exit PRESS SIMULTANEOUSLY (3 secs) Both displays Flash Three seconds approx. Download Wallpaper Gerak Untuk PCI. To enter set Up Mode, put the Controller into Operator Mode with normal display, then: To exit Set Up Mode, select the process variable display, then press the keys simultaneously. NOTE: A return is made to Operator Mode if there is no key activity for two minutes. Set Up Mode Parameter Sequence Flashes once Flashing = Pre-Tune engaged ON = Self-Tune engaged If both Pre-Tune and Self-Tune are engaged, AT will flash until Pre-Tune is finished, then turn fully on.
Goes OFF SET TO CURRENT LOCK CODE VALUE Displays stop flashing If the upper display does not show the correct Lock Code value when this key is pressed, a return is made to the original Operator Mode display. (Default factory setting = 10.) PRESS Parameter Legend Adjustment Range Default Digital Filter Time Constant OFF, 0.5 to 100.0 secs.
Increments 2.0 secs. Process Variable Offset ±span of Controller 0 Output 1 Power Read only N/A Output 2 Power 5 Read only N/A Proportional Band 1 (PB1) 0.0% (ON/OFF Control) to 999.9% of input span 10.0% 1 5 Proportional Band 2 (PB2), 0.0% (ON/OFF Control) to 999.9% of input span 10.0% Reset (Integral Time Constant) 1 1sec. And OFF 5m 00s Rate (Derivative Time Constant) 1 00secs.
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