1
Installation, Operations & Maintenance Manual
SECTION 1 - GENERAL DESCRIPTION
1.1 GENERAL INFORMATION
In this age of sophisticated process control
concepts, many people are taking advantage of
the latest breakthroughs in technology to upgrade
their own equipment and systems. The Milton
Roy Electronic Capacity Control (ECC) easily
interfaces with computerized process and process
instruments, as the ECC will adjust the output of a
metering pump from 0% to 100% in response to a
4 to 20 mA or 1 to 5 VDC signal from a computer
or other source. This outstanding feature can be
purchased as an integral part of the pump, or it can
be bought separately and field installed. The ECC
mounts to the housing of the pump and operates
in place of the manual stroke adjustment.
1.2 PRINCIPLE OF OPERATION
The ECC allows remote adjustment of the
volume of liquid delivered by the metering
pump. This is accomplished by utilizing a
4-20 mA command signal from a Milton Roy
Remote Panel Mount (ARPM-100/200) or Remote
Wall Mount (ARWM-100/200) remote controller
(Manual No 53944), or a customer’s control
system. In a closed loop control system, the ECC
accepts the computer or controller 4-20 mA signal
directly and provides immediate and accurate
control of the pump flow under varying process
conditions.
SECTION 1 - GENERAL DESCRIPTION
When the ECC receives the 4-20 mA command
signal, the drive motor responds by moving the
ECC to the required position. As the ECC moves,
it changes the position of the pump’s stroke adjust
shaft, thus altering the pump’s flow rate. Refer to
Table 1 which lists reference manuals containing
information on the stroke adjust shaft and pump
operation.
Table 1. Stroke Adjust Shaft & Pump
Operation Reference Manuals
NOTE:
As supplied, the ECC is direct acting (pump
capacity increases with increasing input signal
to ECC) although it may be converted to reverse
acting by following the procedure outlined in
Section 3, “Operation”.
Pump
Manual
mRoy
®
53829
MAXROY
®
B
53938
Milroyal
®
C
53939
Milroyal
®
B
53940
Milroyal
®
D
53941
MACROY
®
G
53873
MACROY
®
D
53872
Milroyal
®
G
53942
