Instruction Manual

Mechanical Considerations

The FlatPAC-EN/EN MI is mounted on the bottom surface using standard 8-32 or 4 mm screws (cannot be mount-

ed from the front.)

Maximum allowable torque is 5 in. lbs.,. The maximum penetration for mounting holes A1, A2, A3 and A4 is

0.125 in. (3mm) and for mounting holes B1, B2, C1 and C2 is 0.250 in. (6mm). The minimum recommended

mounting holes are as follows:

1. For standard mounting (forced air cooling), use A1, A2, A3, A4 mounting holes.

2. For standard mounting (conduction cooling), use A1, A2, A3, A4, B1 and B2 mounting holes.

3. For a Vicor 2 Up FlatPAC retrofit replacement, use C1 and C2 as these two are identical to the recommended

mounting holes on the FlatPAC.

For increased ruggedness, additional mounting holes can be used to secure the power supply.

The FlatPAC-EN/EN MI does not have an internal fan. It can be either conduction or convection cooled (same

model).

Avoid excessive bending of output power cables after they are connected to the output terminals. For high-current

outputs, use cable ties to support heavy cables and minimize mechanical stress on connectors. Be careful not to

short-out to neighboring outputs. The maximum torque recommended on output nuts is 10 in. lbs.

For applications that require vibration levels above MIL-STD-810E, minimum integrity test, a shock absorbing

mount design is required.

FlatPAC-EN/EN MI Do’s and Don’ts

• Do not exceed an operating case temperature of 90

C. To prevent an overtemperature condition, an external

fan may be required.

• Run the output (+/–) power cables next to each other to minimize inductance.

• Always turn the power supply off before disconnecting input or output wires.

• When using the remote sense feature, the +Out and -Out load wires should never be disconnected while the

supply is operating. Failing to do so could damage the power supply.

• Do not attempt to repair or modify the power supply in any manner as this action will void the warranty. In

the event of problems, contact Customer Service at 1-800-735-6200.

• Insert proper fault protection at power supply input terminals (i.e., a fuse). Refer pg 13 for more information.

• Use proper size wires to avoid overheating and excessive voltage drop.

• Output voltages over 60Vdc, whether from individual modules or series arrays, are considered as hazardous

secondary outputs under UL 60950. Appropriate care must be taken in design implementation of the supply.

Pg 4 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474 03-000050 rev A

FlatPAC-EN/EN MI Design Guide

Identical mounting

holes (C1 & C2)

to Vicor's

2 UP FlatPAC