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Page 10
Preferred Source – MP1-E Only
Requires Option 10
This feature permits the selection of either
source (1 or 2) as the preferred or normal
source. The normal source is the source that
the switch always looks to for availability so
that it can transfer to it.
Manual Return To Normal – MP1-E Only
Requires Option 29
A manual operated momentary contact
(normally open) operates in conjunction with
the Manual Return to Normal option to
replace the TDEN timing function. With the
manual mode set, closure of this contact will
prompt an immediate transfer bypassing the
TDEN time delay. This ensures that a re-
transfer occurs only at the discretion of the
operator.
6.7 Output Contact Descriptions
The control outputs of the ATS-MP1
controller are dry relay contacts. These
relays are comprised of a latching Form A
relay to provide the Generator Start Relay
contact, a Form A contact for the Transfer
Motor Relay contact, and a Form C relay for
an alarm output. The dielectric rating for
each output is a minimum of 1500 VAC
Generator Start Relay
This latching relay is the generator start
relay for system configurations that employ
a generator on the emergency source. This
relay employs a Form A contact for closure
of the generator start circuit. The Generator
start relay is rated for 5A @ 30VDC with a
30W maximum load.
Transfer Motor Relay
This is a Form A contact is used to close the
electrical path of the transfer motor control
circuit. Closure of this contact will initiate a
transfer from the normal source to
emergency source and from emergency
source to normal source as required per
normal transfer switch operation.
Alarm Relay
The full Form C contact of this relay may be
wired to an alarm enunciator panel to
indicate problem with the ATS. This relay is
normally energized to indicate an absence
of an alarm state. De-energization of this
relay indicates the presence of an alarm
condition. An alarm condition will occur if a
transfer has been initiated but is never
completed (This may indicate that
something is wrong with the motor or
transfer mechanism). The alarm contact
will also change state if the controller
detects a phase reversal condition between
the normal and emergency sources. The
controller will also inhibit transfer on this
condition
Pre-Transfer Relay (MP1-E Only)
Requires Option 35
This feature provides for the control of an
external 120V instant relay with 2 Form C
contacts to remotely signal that a re-transfer
is about to take place.
7. Operation Voltage and
Measurement
Both the MP1 and MP1-E operate on single
and three phase systems with selectable
frequency settings of 50Hz or 60Hz.
7.1 MP1
This MP1 operates directly from the line
sensing inputs of the two different sources
(normal and emergency). The nominal
operating system inputs are from 110VAC-
240VAC. The standard system assumes
that neutral is available and that the transfer
motor can therefore be powered from an
available 120 VAC source. If a neutral
conductor is not available, a 120VAC supply
is created by an external transformer.
7.2 MP1-E
The MP1-E provides the user with an
enhanced feature set, and a wider range of
voltage measurement, from 110VAC-
600VAC. A high impedance resistive circuit
is used in series with the voltage sensing
inputs to reduce the voltage applied to the
controller to comply with safety codes for
door-mounted devices. The power supply
for the MP1-E requires a 120VAC source,
provided by an external transformer.
I.L.15.01.T.K
.
Effective June 2000
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