5101 Engine Start Monitoring System
381333-474 C 7
Description of Operations
The 5101 operates using two modules in addition to the traditional engine start contact on a transfer switch and the engine
start input at a generator. The first module is the 5101-ATS module which resides near to or within an ATS. The second
module is the 5101-GEN module which resides within or near to the generator enclosure. Using these modules allows the
system to monitor the integrity of the control wiring between the two modules. Since these modules are extremely close to
their terminal points and the long distance run between them is monitored for faults (short or open circuit) they greatly
increase the reliability of the system by minimizing the chances that such a fault goes un-noticed.
The system uses a 5101-ATS module placed inside the transfer switch and requires no power. This module connects to the
traditional engine start contact (open or close to start) locally within the transfer switch. This module’s output (TB2) is
then wired to the 5101-GEN module.
The 5101-GEN module requires 24Vdc control power from a reliable source (usually generator batteries) to properly
operate. It can accept connections from up to 8 5101-ATS modules. The 5101-GEN module’s outputs are one Form C
output contact used to feed the generator’s start input as well as one Form C Alarm contact to feed any external
monitoring system.
These two modules work in collaboration to sense the state of the source contact feeding the 5101-ATS module and
mimicking its position at the 5101-GEN module. This allows the system to properly start and stop the generator during
normal operation with intact wiring, however should the two modules detect a short or open fault between themselves
they shall enter alarm mode by dropping out the alarm contact and generator contact. This ensures that the generator is
available should a transfer switch require it while also bringing attention to the fault so that it can be corrected.
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