Accudyne Industries Milton Roy Milroyal Series, Инструкция по эксплуатации, Страница: 32 / 68

22 Installation, Operations & Maintenance Manual
4.8 ECC CALIBRATION
YOU WILL BE MAKING
ADJUSTMENTS TO THE ECC
CONTROL CIRCUIT BOARD WHILE IT IS POWERED UP. THIS
CONTROL BOARD IS POWERED BY POTENTIALLY
DANGEROUS VOLTAGE (115 OR 230 VAC). THE CALIBRATION
PROCEDURE IS TO BE PERFORMED ONLY BY QUALIFIED
PERSONNEL FAMILIAR WITH THE HAZARDS INHERENT
WORKING NEAR HIGH VOLTAGES. MILTON ROY ASSUMES NO
RESPONSIBILITIES FOR DAMAGE TO EQUIPMENT OR INJURY
TO PERSONNEL WHILE PERFORMING THIS CALIBRATION
PROCEDURE.
NOTE
ECCs are calibrated at the factory and usually
do not need to be calibrated initially.
4.8.1 Calibration Routines
The Milton Roy ECC has nine adjustment
potentiometers. These potentiometers adjust the
ECC’s span and zero travel, lower and upper
travel limits, feedback zero, feedback span,
control offset, range offset, and feedback offset.
Control offset, range offset, and feedback offset
will only be adjusted during a complete calibration
procedure (calibration C). These three adjustments
are usually not changed.
Before calibration is performed set-up the voltage
selector switch, SW1 (Paragraph 2.6.4), input
signal SW2 (Paragraph 2.6.2), and feedback
output signal SW3 (Paragraph 2.6.3). Use of the
feedback output signal is optional and needs set
only if it will be used.
There are three levels of calibration that can be
performed.
Use the appropriate calibration
routine for your requirement. For all routines,
reference Figure 10 .
4.8.1.1 Calibration A
Calibration A is performed to synchronize the ECC
with the pump. Calibration A is performed when:
• Replacing any components in the position
feedback assembly. This includes the nylon
worm gear/driver, the potentiometer, and/or
potentiometer gear.
• Adding or removing reverse action jumpers
(section 3).
1. Tools needed for calibration A:
a) Digital volt meter (DVM) or equivalent with
resistance, 5 VDC, and 20 mA.
b) 4-20 mA (1-5 VDC) source and 115 or 220
VAC source
c) Precision screwdriver to adjust potentiometers
d) Tool kit
2. Preparation:
a) All new components should be replaced.
b) Insure pump is set to 0% setting.
c) Remove AC power.
d) Loosen set screw (530) in base, remove
cover (280) from ECC.
VOLTAGE SELECTOR SWITCH
SW1 LOCATED ON TOP OF THE
CIRCUIT BOARD MUST BE SET TO THE VOLTAGE LISTED ON
YOUR DATA PLATE
(FIGURES 1 OR 2) , OR DAMAGE TO MOTOR
WILL RESULT.
e) Ensure voltage selector switch is set to 115
VAC or 230VAC as indicated on data plate
(Section 2).
f) If circuit board has been replaced ensure DIP
switches SW2 and SW3 are set as needed
for proper orientation (Section 2).
g) Remove ECC from Pump.
3. Remove PCB (Paragraph 4.4.1) to gain access
to feedback potentiometer.
SECTION 4 - MAINTENANCE