e Type
Series M450
Combined
Manual and Automatic
Metron Fire Pump Controllers conform to the latest
requirements of Chapter 7, National Fire
Protection Association Pamphlet 20, Standard for
Centrifugal Fire Pumps as adopted by
Underwriters Laboratories and Factory Mutual.
They are withstand rated and listed by
Underwriters Laboratories and approved by
Factory Mutual Research Corporation.
Sizes range from 15 to 600 horsepower, 200 to
600 volts, 60 Hz. These controllers are for use on
Reduced Voltage type installations.
Only the highest quality components, all UL listed
or UL recognized, are used throughout to assure
the best possible reliability. The cabinet is
fabricated of heavy gauge reinforced steel with
drip-proof hood. All field wiring and service
connections may be made from the front, allowing
the controller to be mounted flush against a wall.
The controller is completely wired, assembled, and
tested at the factory before shipment, and ready
for immediate installation. Standard and Optional Features
Standard Features
Minimum Running Period Timer to
prevent cycling of the system. This timer is
factory set for 10 minutes. A drop in system
pressure will initiate the start sequence and
the running period timer. The pump will run
until the timer times-out or the system
pressure is restored. By-pass Jumper installed on a convenient
terminal strip which by-passes the running
period timer for manual stop operation.
When automatic stop is required, just
remove the jumper. A stop push-button is
provided for emergency stop. Single Handle Mechanism for operating
both isolating switch and circuit breaker in
the proper sequence. Built-in Pressure Switch (standard is 25-
300 psi freshwater type), mounted
internally. Pressure Recorder 0-300 psi freshwater
type, mounted externally.
Power Monitor which constantly monitors
and alarms Phase Reversal and Loss of
Power conditions. Dry Contacts for remote indication of
Pump Running, Power Available, and
Phase Reversal.
Dry contacts for remote indication of
Motor Overload set at 125% of motor full
load current.
Pilot Lights to indicate Power Available,
and Phase Reversal.
Digital Volt/Amp Display on face of
enclosure.
Emergency Start Lever for closing the
starting contactor independent of automatic
or manual control circuits.
Remote Start Circuit for remote starting.
NEMA Type 2, drip-proof enclosure.
UL Service Entrance Rated.
Series M450
Autotransformer Fire Pump Controllers
incorporate a heavy-duty autotransformer with
taps available at 50%, 65%, and 80% to
reduce the starting voltage to the motor. The
autotransformer is factory wired to the 65%
taps unless specified otherwise.
The starting inrush current drawn from the
power source is reduced to approximately
25% of normal when using the 50% tap, 42%
of normal on 65% tap, and 64% of normal on
80% tap.
Taps other than listed above are also
available. Consult factory for information.
An adjustable timing relay is provided to
control time between reduced voltage start
and full voltage operation. An emergency start
handle to close starting contactor
independent of automatic control circuits is
also supplied as standard. When used, this
handle will bypass the reduced voltage start
feature and start the motor with full inrush
current drawn from the power source.
Options
Option A1: Built-in Alarm Panel
This option supplies an audible alarm with
silence pushbutton for PUMP RUNNING and
POWER FAILURE. It also provides a visual
only indication of SUPERVISORY POWER
on. This option requires that a separate
reliable source of 120 V.A.C. be connected to
the controller. Additional lights and alarm
conditions may be added if required. Consult
factory for availability.
Option A2: This Alarm Provides a
Visual Indication only of the
following:
Low Pressure, Local Start, Remote Start,
Deluge Valve Open, Phase Failure, Interlock
on, Run Timer On, Pump Running. Can be
supplied separately or all eight.
Option C: Pump Failed to Start
A pilot light and dry contact, N.O./N.C. are
furnished to indicate that the pressure switch
has signaled a start but the motor contactor
has not closed to supply power to the electric
motor. An adjustable 0 to 10 second timer is
supplied to control the time between the
closing of the pressure switch and the
activation of the alarm condition.
Option D: Deluge Valve Start
This option is a remote start function. An
external normally closed contact is connected
to the controller which, when opened, signals
the controller to start as if the pressure switch
had sensed a low pressure condition. If option
S Sequential Start is supplied, the timer
must time out before the controller will start
after the deluge valve contact opens.
Option E: Engine Lockout
A set of normally open dry contact is provided
to interconnect to the lockout circuit in a
diesel engine fire pump controller. When the
electric motor controller starts, the diesel
engine controller is prevented from starting on
a pressure drop or is stopped if it is already
running.
Option G1: Pressure Switch
Auxiliary Contacts
One set of N.O./N.C. dry contacts for
indication of pressure switch position.
Option G2: Contacts for High
Zone/Low Zone Operation
A relay with N.O. contacts wired to the field
wiring terminal block closes upon the
operation of the pressure switch on a low
pressure condition. It remains closed as long
as the electric motor is running. This option
along with option S Sequential Start is
normally furnished on a High Zone controller
to provide a signal to the Low Zone controller
causing it to start and provide pressure to the
suction side of the High Zone pump. The Low
Zone controller must be supplied with option
D (deluge valve start) for proper operation of
the two controllers.
Option G3: Low/Low Pressure
Indication
A set of N.O./N.C. dry contacts are furnished
via a second pressure switch which will
activate an alarm if the pressure drops below
the preset starting pressure of the controller.
Option H: Space Heater
If the ambient atmosphere is especially damp,
a space heater rated at 100 watts may be
supplied to reduce moisture in the cabinet. A
thermostat is supplied as standard with this
option. A humidistat may be substituted if
specified Option J: Loss of Control Power Dry
Contacts
A relay is wired across the secondary side of
the control power transformer. Dry contacts,
N.O./N.C. are wired to the field terminal strip to
provide a remote signal if the control power
transformer fails. This relay will also be
activated if there is a complete loss of power
to the fire pump controller; i.e., the circuit
breaker/isolation switch is turned off.
Option K: Pump Room Temperature
Alarm
Provides visual indication, an audible alarm,
thermostat, and dry N.O./N.C. contacts which
operate from the externally mounted
thermostat to indicate a LOW PUMP ROOM
TEMPERATURE condition.
Option L: Local Pump Running Light
An externally mounted pilot light is supplied
which illuminates when the motor contactor is
closed and supplies power to the electric
motor.
Option M: Motor Lockout
This option is used with multiple pump
installations when only one pump should be
running. Upon receipt of an external signal
(may be from another fire pump controller if it
is compatible), this option will prevent the
motor from starting or will stop it if running. It is
also used with Low Suction Cutoff Panels
when authorized. When used for this purpose,
power to the Low Suction Cutoff Panel is
provided by the controller.
Option P: Supervisory Power Failure
Start
This option provides a start of the electric
motor if there is a loss of an external source of
120 V.A.C. A relay is provided that is
energized when the external 120 V.A.C. is
present. Upon loss of the 120 V.A.C. the relay
drops out and a contact closes and starts the
electric motor.
Option Q: Loss of Supervisory
Power Light
A pilot light is provided which illuminates if
there is a loss of the 120 V.A.C. external
source.
Option R: Audible Alarm
An externally mounted bell is supplied which
sounds when an alarm condition occurs in the
fire pump controller. An example would be if
the controller activates into a PUMP
RUNNING condition. Other conditions can be
supplied if specified, i.e. SUPERVISORY
POWER FAILURE (Option P), PUMP
FAILED TO START (Option C) etc. The
condition(s) must be specified.
Option S: Sequential Start
This option is normally used on multiple pump
installations to prevent the pumps from starting
simultaneously. This is accomplished by use
of adjustable timer supplied in all the
controllers except the lead controller. The
standard timer is adjustable from 0 to 100
seconds. These timers should be adjusted at a
5 to 10 second interval in order to allow a
preceding pump to start. Failure of preceding
pump to start will not prevent a subsequent
pump from starting.
Option T1 and T2: Weekly Test Start
In some cases it may be desirable to have the
electric motor run at a preset time each week
for approximately 30 minutes. A program clock
is provided to control the time of day, day of
week, and the running time for the test period.
The start can be accomplished by the
activation of a relay or through an externally
mounted solenoid valve. The solenoid valve is
opened to begin the start by dropping pressure
to the controller pressure switch. This option
can be provided with a test pushbutton (T1) or
without (T2).
Option U: Local Motor Stopped Li