7
INDEX AND DOWN ARROW:
Pressing these
keys simultaneously will allow backing up one
menu item, or if at the first menu item they will
cause the display to return to the primary menu.
If an alarm condition has occurred, these keys
may be used to reset the alarm.
INDEX AND ENTER:
Pressing these keys
simultaneously and holding them for 5 seconds
allows recovery from the various error
messages. The following menu items will be
reset:
ALiH
: Alarm inhibit
CHEC CAL
: Check calibration error
Correct the problems associated with the above
conditions before using these reset keys. More than one
error could be present. Caution is advised since several
items are reset at one time.
THE HOME DISPLAY
The home display is the normal display while the control
is operating. If no errors or functions are active, the
HOME display will indicate the Process Variable (the
level that is being measured) on the top display and the
SP1H
value, Pump 1 On Set Point, on the bottom display.
Error messages may over-ride the HOME display. See
ERROR MESSAGES on page 13.
While in the
Secondary Menu
, if no key is pressed for
a period of 30 seconds, the display will return to the
HOME position displaying the process value. While in
the
Secure Menu
, if no key is pressed for a period of
60 seconds, the display will return to the HOME position
displaying the process value. Outputs are disabled
(turned off) when the
Secure Menu
is active.
SECURITY LEVEL SELECTION
Three levels of security are provided. The
SECr
menu
item security level may be viewed or changed at any time
regardless of the present security level in the Secure
menu. The display shows the current security level. To
change security levels change the password value using
the
UP ARROW or
DOWN ARROW keys and
pressing the
ENTER key. Refer to the password
table (following) for the correct value to enter for the
security level desired.
To set the access level to, for example,
2
, at the
SECr
menu item press the
UP ARROW key until the upper
display shows the password,
1101
. Press the
ENTER
key. The display will blink, and return with the level value,
2
, in the upper display.
The password values shown in the table cannot
be altered. Retain a copy of these pages for future
reference. This is the only reference made to password
values in this instruction book.
LEAD/LAG OPERATION
The Mercoid
®
MPC pump controller is designed to easily
operate a pair of pumps in the most efficient manner
possible. The controller has a ‘lead/lag’ feature that
allows two pumps to operate in an alternating fashion to
minimize wear.
The Mercoid
®
MPC pump controller has a pair of set
points each for pump 1 and pump 2. If the lead/lag
feature is turned off,
SP1H
and
SP1L
control pump 1 and
SP2H
and
SP2L
control pump 2. If the lead/lag feature is turned
on, pumps 1 and 2 will be controlled in the alternating
fashion described below. In all cases the P1 lamp will
indicate activity of pump 1 and the P2 lamp will indicate
activity of pump 2. The lead/lag operation is set in the
Secure menu with the item
LdL9
.
Lead/Lag On
After installation, set the
SP1H
to the high level (pump on
point) for standard operation. Set
SP1L
to the low level
(pump off point). Set the
SP2H
to the level where you want
BOTH pumps to turn on (emergency pump on). Set the
SP2L
to the level where you want the second pump to turn
off (emergency pump off).
The controller will not allow you to set
SP1H
below
SP1L
,
SP1L
above
SP1H
,
SP2H
below
SP2L
, or
SP2L
above
SP2H
. The
controller will not allow you to set any set point or alarm
point above or below the programmed scale. No error
messages are generated. The displayed value will stop
at an allowable point just above (or below, as the case
may be) the maximum or minimum allowed.
In normal operation, when the
SP1H
point is reached, one
of the pumps will turn on. When lead/lag is turned on,
pumps 1 and 2 will alternate. If the level reaches the
SP2H
point, both pumps will be turned on until the
SP2L
point is
reached, where one of the pumps will turn off. When
SP1L
is reached, remaining running pump will turn off. The last
pump off will not be the next pump on.
Lead/Lag Off
If lead/lag is turned off,
SP1H
and
SP1L
control pump 1 and
SP2H
and
SP2L
control pump 2. There is no alternating
function.
SEAL FAILURE OPERATION
The Mercoid
®
MPC Pump Controller is designed to work
with most types of submersible pump moisture sensors
to detect outer seal failure. Most often the moisture
sensor is a conductance device that detects moisture in
the oil chamber indicating an outer seal failure. Using a
2.5 VDC power supply sent to the moisture sensor the
MPC Pump Controller monitors the resistance between
the probe lead wires or the single probe lead wire and
ground. The resistance set point is adjustable over the
range of 10K to 500K Ω adjustable in 10K ohm steps,
and is set with Secondary menu items
SFS1
and
SFS2
.
When the resistance of the moisture sensor decreases
below the resistance set point the MPC controller goes
into the programmed seal failure mode.
PASSWORD TABLE
Menu
Security
Level
Status
Displayed
Value
When Viewed
Password
Value To
Enter
Secondary
Secure
Secondary
Secure
Secondary
Secure
Locked
Locked
Unlocked
Locked
Unlocked
Unlocked
2
3
4
1101
1011
111
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