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EBARA Multi-Stage Dry Vacuum Pumps
3.5
Electrical Connections
DANGER
!
All Equipment must be properly grounded.
Before attempting any repairs or adjustments to this equipment, be sure that the
power to the unit is disconnected.
The electrical installation should only be undertaken by properly trained
personnel.
• All electrical installations should be in accordance with local regulations, the
National Electric Code, and all other applicable codes and ordinances.
• All connections to and from the electrical supply must be with suitable
connectors.
3.5.1
Control Panel
Typical Description – varies with each pump installation.
The control panel is the main interface between the pump modules and in-house
system and electrical connections. The control panel contains relays and controls that
monitor the cooling water and nitrogen purge flow. Also available are outputs signals
from each of these controls for remote monitoring.
The standard Ebara control panels are for 208 volt, 3-phase, 4-wire service. A main
circuit breaker receives the incoming power conductors and provides over current
protection. The power to each motor is controlled by a contactor. An overload relay,
mounted to the contactor, senses when the motor is overloaded or when there is a
motor phase imbalance. When the rear pump overload relay (OL1) trips, the pump
stops. An ammeter for each motor is mounted on the cabinet door. This allows the
user to monitor the motor current.
Overload contactors–relays: MS1–OL1.
When cooling water flow is not sufficient, the water flow switch opens, dropping out
relay 69X1. A NC 69X1 contact closes, which energizes 69T, a 3-minute timer. If the
water flow is still not restored in this time, 69T times out. This stops the pump motor.
There are indicator lights on the control panel for the following conditions:
AC power supplied to the unit
Pump running
Pump overload
Fore pump overload
Low cooling water
There are two signals available that can be used on the customer's control system.
These are relay contacts and are connected to the following terminals:
C1-C-2 Fore Pump Running (Closed when running)
C1-C3 Cooling Water Failure (Open when water failure)
930601-P
Installation
15
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