GE Industrial Solutions ASTAT BP User Manual
Page 48
ASTAT BP User Manual
48
GE Industrial Solutions
©2013 GE Company All Rights Reserved
Area [m
2
] =
Heat dissipation from the ASTAT-BP is calculated as:
Ploss=3x1.3x
I+FAN loss
where:
I represents motor starting current. Note that the motor current during the start process is higher than the
motor rated current.
FAN loss represents power loss caused by all internal fans (refer to section 3 page 11 for fan loss per model).
For example, during start of a 820A motor when
Current Limit is set to 400%, heat dissipation can be
calculated as:
Ploss=3x1.3x4x820+50=12,792Watt≈12.8kW
While a 820A motor is running (bypass is closed) and the motor current is 820A, heat dissipation can be
calculated as:
Ploss=3x1.3x0+100+50=3,198Watt≈3.2kW
Important Note: If the motor is started frequently, the cabinet should be designed for greater heat dissipation.
You can reduce the enclosure heating by adding ventilation.
5.3.1
Forced Ventilation
Use the following arrangement for forced ventilation of the ASTAT-BP’s enclosure:
General purpose
enclosure
Fan at air outlet
ventilates
Non-ventilated
enclosure
Fan circulates existing
air.
Fan
Calculating the Enclosure Size, for Non-Ventilated Metal Enclosure
where:
Area [m
2
] represents the surface area that can dissipate heat (front, sides, top).
Total heat dissipation [Watt] represents the total heat dissipation of the ASTAT-BP and other control devices
in the enclosure. If the ASTAT-BP is started frequently you should use average power.
55..44
Bottom View of the Control Module (QB x 210 - QB x 1100)
ASTAT-BP
ASTAT-BP
0.12 x Total heat dissipation [Watts]
60 – External ambient temperature [°C]
Terminals (-), (+) - Modbus
connection terminals (optional)
Profibus D9
connector/DeviceNet 5
terminals
(optional)
Remote keypad connector
(optional)
Connectors to power section
Terminals T1, T2 Gnd, Out
(-), Out(+) - Analog out
and thermistor in
( ti
l)
Terminals A1, A2, B1, C1,
13, 14, 23, 24
Terminals F1, F2 – Fan
control (optional)