SECTION 3
OPERATION
43
The pressure controller, model MP1-200, has several “dry” contacts available. On site wiring of
these outputs must be done by the customer or electrical contractor to fully utilize the available
features. All of the outputs require power from an outside source. The contacts are operated by a
relay mounted on the MP1-200. The relay contacts are rated for 250VAC, 1A. Output loads are
requested to be non-inductive. MIURA does not recommend installing an induction load, such as a
solenoid valve or transformer. If an induction load is to be connected, use an external relay
operated by the contact to avoid inductive kick on the MP1 circuit board.
a) Sensor fail output (Terminal block No.9)
This contact closes when an error is detected with the pressure sensor installed on the steam
header. When this contact closes, a sensor failure or disconnection in wire to the sensor is
attributed to the possible cause.
b) Communication status output (Terminal block No.11)
The communication status is output through the contact. Operation varies depending on the
setting of the “SWITCH 1” installed inside.
P.16
When the SW1-4 is OFF
The contact closes if an MI Terminal MT1-200 has a communication error.
When the SW1-4 is ON
The contact closes if there is no problem in communication with all the MT1-200 units.
c) Boiler operation output (Terminal block No.12)
The contact closes when the operation switch of any of the boilers is ON.
When all the boiler's operation switches are OFF, the contact opens after five seconds.
The operation switch of any boiler with a communication error is considered to be in the OFF
state.
d) Alarm output (Terminal block No.14)
This contact closes when any contact of pressure alarm H (No.20), pressure alarm L (No.18),
boiler trouble (No.17), and emergency stop (No.15) is closed.
This contact opens under the following cases.
• All these contacts open.
• The alarm confirmation input (No.4 and No.5 input) is ON.
• The “DISPLAY CHANGE” switch on the control panel is pressed.
Содержание MP1-200
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