6
M2B Microprocessor Controller
Introduction
The M2B is a microprocessor based process controller designed for
exclusive use with the Sterlco Temperature Control Units. The M2B
monitors and maintains the temperature of the fluid in any given process to
a selected set point using a unique proportional integral derivative (PID)
auto-tuning program. The controller employs PID algorithms and fuzzy logic
to automatically tune the system to heat or cool the fluid as required by the
process.
The M2B has LED displays for set point and process temperatures.
Controller status lights are provided for the following functions: cool, heater
high/low, run, flow, return and delivery temperatures, and temperature
differential.
The controller includes self-diagnostics to check hardware functions.
Diagnostic lights are provided for the following functions: low fluid pressure,
safety thermo, high/low alarms, delivery and return probes, and motor fail.
The M2B is panel mounted and has a membrane keypad with tactile feed-
back. When properly installed with a sealing gasket, the M2B is safe for
water washdown.
Figure-1
P7
P8
H
A2
T/C
D
E
Soldered
Ribbon
Cable
K
PUMP
HIGH HEAT
COOL
ALARM VENT LOW HEAT PURGE
COOL
LOW HEAT
SSR or
4-20MA PLUG
IN MODULES
HIGH HEAT
SSR
ONLY
G
B
EXT
INT
CONTROL
POWER
SELECT.
P5
P2
P6
P7
P3 P4
P8
P9
P10
A
Lowest Level Board contains Serial Label - lower left.
PROCESS OUTPUT/REMOTE S.P.
PLUG IN MODULE
RS485/RS232
PLUG IN
MODULE
Flow
Input
White
Return
RTD
Red
Delivery
RTD
Black
Press
Switch
Phase
Relay
2nd
Setpoint
Safety
Thermo
L1 OUT
L1 CTLR
L2
ALARM
PUMP
VENT
HI HEAT
LOW
HEAT
COOL
Thermocouple
1
2
3
4
5
6
7
8
9
10
11
12
PURGE
HEAT
COOL
+
-
+
-
DATA +
DATA -
PV OUT
RMT SP
GRD
+5V
IN
P6
P9
P11
P10
+
-
+
-
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