Siemens 125-3208 operating instructions Override Jumper, Fuses

SED2 VFD Electronic Bypass Option Operating Instructons

Override Jumper

An Override Jumper (J8) is supplied on the Controller board. Moving this jumper to the override position removes the Controller board and its keypad from the control and closes the drive output contactor (and the input contactor if supplied).

VFD0121R1

BPEC

J2

J1

J8

OVERRIDE JUMPER

J8 SHOWN IN NORMAL POSITION

BPEC

J2

J1

J8

OVERRIDE JUMPER

J8 SHOWN IN OVERRIDE POSITION

Fuses

Figure 14. Override Jumper J8 Location and Positions.

The Controller board contains a fuse (F1) under its cover (Figure 15). Determine if the fuse F1 needs replacement as follows:

1.If the basic sanity test indicator (Figure 15) is flashing, fuse F1 is OK and no action is required.

2.Verify that 120 Vac power is available on the secondary side of the Electronic Bypass Option power transformer (Figure 15). If power is not proper, check the Electronic Bypass Option components such as:

•Power transformer

•Power transformer fuses (F2, F3, and F4). Table 8 provides fuse replacement information.

3.If power is proper, check fuse F1 as follows:

•Power down the Electronic Bypass Option.

•Remove the Controller board cover.

•Remove fuse F1.

•Use an ohm meter to check the fuse.

•Replace fuse F1 if necessary.

NOTE: Replace fuse F1 with an 8 AG, 1/2 amp, 250V, fast-acting instrument fuse such as a Bussmann AGX1/2 or Littlefuse 361.500.

52 Siemens Building Technologies, Inc.