14
Installation, Operations & Maintenance Manual
SECTION 3 - OPERATION
3.1 CONTROLS
The Milton Roy ECC is equipped with a hand wheel
that can be used to reposition the ECC shaft. The
hand wheel can only be used when the primary
power is off.
3.2 INITIAL START-UP
Fill the pump with oil and prepare the pump for
operation according to procedures in the instruction
manual for the pump.
1. Check signal connections. The signal HI (+) and
signal LO (-) must be connected correctly or the
ECC will not respond. (Installation, Section 2)
2. Apply a command signal.
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.
3. Apply AC power.
4. Slowly change the command signal from one
extreme to the other. The pump capacity knob
should move from 0% to 100% and back to
0%.
5. If the unit performed properly, confirm that all
connections have been made properly, install
the cover on the ECC. Torque the cover to
15 lb-ft (20 N-m). For explosion proof units,
tighten set screw in base using a 5/64” hex
key to lock the cover and prevent tampering
while in operation. Install unit in service. (If the
pump moved but did not have the proper travel,
the ECC may need to be adjusted. See ECC
Calibration, Section 4.)
3.2.1 Operating Modes
The Milton Roy ECC can be set for one of two
modes of operation. The operating mode must be
established before the control signal can be set
up. The ECC is factory configured for direct-acting,
4-20 mA command signal range, which is the most
common. The model number, found on the data
plate, determines the mode set by the factory.
Two modes are described below:
1. Direct-acting - an increasing control signal
drives the pump to 100% capacity.
2. Reverse-acting - an increasing control signal
drives the pump to 0% capacity.
Perform the following procedure to change the
operating mode:
1. Apply power and drive ECC and capacity control
knob to 100% capacity setting by applying a
20 mA command signal.
2. Remove power from ECC and remove cover.
3. Install jumper plugs between circuit board and
potentiometer and circuit board and motor
(Figure 8)
. Jumper plugs are available from the
factory:
3 wire jumper 0152173200 (J2)
5 wire jumper 40229 (J1)
Motor
Potentiometer
Assembly
J2
J1
9 PINS
3 Wire Jumper
Circuit
Board
5 Wire Jumper
Install jumpers
and reconnect as
shown for reverse
action mode.
Figure 9. Jumper Plugs/Action Mode
Conversion.
