Space Saving and Cost Saving
The 4 channel (MA900) and 8 channel
(MA901) controllers offer a saving in cost over single
channel controllers having the same specification. In
addition substantial savings in panel space, panel cut
out time and wiring time can also be made.
Individual channels may be set up
for a range of control, monitor, alarm and indication
functions and unused channels may be turned off.
Parameters may be manually selected on the front
control panel or the display may be set to
automatically scan each loop in sequence. Scan time is
Fully programmable PID or On/Off
with adjustable hysteresis as configured by the user.
A valuable time saving feature
simplifying commissioning and guaranteeing optimum
Set Point Rate Limiter
For applications which require a
controlled rate of heating, the setpoint can be
programmed to automatically ramp up or down at a preset
A wide range of thermocouple inputs
may be specified. The user may configure different
thermocouple types for each channel. Resistance
thermometer or voltage inputs are also available.
Relay, SSR and current outputs are
available for heat and heat/cool outputs. Output type
is defined in a group of four. It is therefore possible
to specify a different output on channels 5 to 8 on the
MA901 and cooling output on channels 1 to 4 on the
MA900 heat/cool version.
A single common alarm (common to
all channels) is supplied as standard. Alarm action may
be configured as temperature deviation, process or set
value or as a loop break action. Up to two additional
common alarms may be specified. On the 4 channel MA900
controller the second control output may be configured
for independent alarm action for alarm 3.
Heater Break Alarm
In the event of a heater failure
this option produces an alarm output. A matching
current transducer available from TC Ltd., is required.
Heat/cool control action is
available with autotuning on the 4 loop MA900
controller. A choice of control signals is available
for both heat and cool outputs.
The digital input contact option
allows remote selection of memory areas and run/stop.
RS232 and RS485 communication is
available for Modbus and ANSI X3.28 protocols allowing
easy connection to PLC and PC based SCADA systems.
Memory Area Location of Set and
To facilitate changing parameters
during production, the M900/901 can store up to 8
groups of set/alarm values and PID control terms.
Selection of each group or recipe may be performed from
the front panel or remotely.
Waterproof and Dustproof
An IP65 version is available for
applications where dust or moisture can affect