GENERAL SPECIFICATION
SECTION 15901
CONTROLS AND INSTRUMENTATION
(BOILER PLANT)
PART 2.1 H: REQUIRED CONTROL FUNCTIONALITY
PLANT MASTER CONTROLLER
For more information contact:
boilers@micromod.com
MicroMod Automation & Controls, Inc.
75 Town Centre Dr.
Rochester, NY 14623 USA
Tel. 585-321-9200
Fax 585-321-9291
www.micromod.com
H. Required Control Functionality
a. The Plant Master controller shall compare the measured steam pressure signal to a
local setpoint and provide a supervisory setpoint to all the Boiler Master controllers.
Up to three Boiler Masters shall be supported as standard.
b. A Lead/Lag function shall be available that brings up to three boilers online
automatically as plant demand requires, and automatically shuts down the boilers
running at minimum load when plant demand decreases. It shall be possible to set the
boiler lead/lag sequence and a deadband on the load points from the front panel of the
controller. If the plant master does not receive the Release-to-Auto signal from the
BMS within a user-selected time period, it shall attempt to start the next boiler in the
sequence. If the final sequence does not match the original configured sequence, the
plant master shall automatically change its sequence and sequence indication to match
the actual order in which the boilers start. The Lead/Lag option shall provide an Hours
of Operation meter and display for each boiler, and indication of the number of days
the current sequence has been in operation, on the front panel of the controller.
c. A steam flow feedforward calculation shall also be available to anticipate changes in
plant demand.
d. Options shall not be mutually exclusive and shall be capable of being enabled from the
front panel of the controller without reconfiguration of the control strategy, provided
the required I/O is installed. It shall be possible to add optional I/O in the field at any
time and have it automatically recognized once the option is enabled.
e. All inputs and outputs shall be galvanically and optically isolated such that a failure of
one I/O point shall not cause failure of any other.
f. Communication via RS-485 Modbus RTU for connection to a computer or operator
panel shall be included as standard.
g. Controllers shall carry a 2-year warranty after date of shipment.
h. Boiler-specific documentation that clearly explains system installation, setup, startup
and operation of the controller for combustion control shall be provided. Generic
controller installation, configuration and operation manuals shall not be acceptable.
i. The system shall be factory manufactured and tested according to FM/CSA Class 1,
Division 2, Groups A,B,C,D. The control system shall be a MicroMod Automation,
Rochester NY, TrimPAK combustion control system.