Safety Interlocks - EBARA ESA25-D Instruction Manual

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Safety Interlocks

WARNING Check Safety Interlock functions periodically (every 6 months)
to confirm the interlocks will work correctly.
E O (EMO)
MERGENCY FF
A manually activated button breaks a low-voltage control circuit that, in turn,
interrupts line power. Restarting the pump(s) requires a manual reset of the
twist-lock button.
N F L
ITROGEN LOW OW
A normally open flow switch breaks when nitrogen supply to the pump (oil
bearing(s) and inter stage injection) drops below its factory set point, opening the
motor starter relay(s) and shutting down the pump. Restoration of sufficient
nitrogen flow permits restarting the pump.
M O
OTOR VERLOAD
Motor thermostat protect the pump motor from overheating due to extended
current draws in excess of the motor rating. Under a persistent overload
condition, motor thermostat opens a contact, which interrupts the motor run circuit.
A brief cool down interval permits restarting the pump.
O P
VER CURRENT ROTECTION
The nearly instantaneous current rise from a line-to-line or line-to-ground short
very rapidly opens a main fuse and interrupting power supply to the electrical
panel. Manual reset, which requires clearing the fault condition, is necessary
before restarting the pump.
EBARA
CORPORATION
PM10U