Technical Specifications
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page E-41
8
9
10
11
B
C
D
1
2
3
4
5
6
7
E
Auxiliary Power Supply Load Requirements
This tables lists the auxiliary power supply requirements for the 890 units and ancillary equipment,
assuming normal operating conditions with maximum SMPS and fan loads.
Item Load Requirements Item Load Requirements
Tech Cards - Speed Feedback
8902/EQ : HTTL Encoder 8W 8902/E1 : Sin/Cos Encoder 3.3W
8902/RE : Resolver 3.2W
Tech Cards - Communications
8903/DN : DeviceNet 1.3W 8903/RS : RS485 (Modbus) 1.3W
8903/FA : Firewire 0.7W 8903/PB : Profibus 2.3W
8903/CN : ControlNet 1.3W 8903/CB : CANOpen 1.3W
Keypads
6511 Keypad 0.9W 6901 Keypad 1W
Worked Examples
To calculate the total requirement for an 890CS Frame D fitted with a 6511 keypad:
Power = 24 + 10.2 (fan load) + 0.9 = 35.1W, Input Current @ +24V = 35.1 / 24 = 1.463A
To calculate the total requirement for an 890CD Frame D fitted with a 6511 keypad and Profibus Tech Card:
Power = 20 + 0.9 + 2.3 = 23.2W, Input Current @ +24V = 23.2 / 24 = 0.967A
IMPORTANT
The 890's internal +24V SMPS has a 3A current limit which is used during start-up.
In a system containing ten 890 units for example, the initial loading will be 10 x 3A for approximately 50ms during
start-up, i.e. 30A. Consequently, the customer auxiliary SMPS +24V power supply must be able to over-load for a
brief time to accommodate the start-up condition.
To Next Page
Loading...
