Maintenance
51
6.5 Fuse Replacement
The controller contains two mains fuses. Failed fuses are an indication that an
equipment problem could exist. Problem resolution and fuse replacement should
only be performed by qualified service personnel. Refer to Figure 29 and perform
the following steps to replace the fuses:
1. Disconnect power to the controller (including power to relays if powered).
2. Open the hinged controller cover by completely loosening all four captive
screws in the cover.
3. Remove the high voltage barrier; pull out on the lever of the captive fastener
then pull straight out on the barrier. Set the barrier aside for reinstallation.
4. Remove the fuses and install new fuses of the same type and rating
(T, 1.6A, 250 V, slow blow).
5. Reinstall the high voltage barrier.
6. Close the controller cover and hand-tighten the four screws.
7. Reconnect all power to the instrument.
Figure 29 Fuse Replacement
1. Fuses F1 and F2, 1.6 A
NCNCNC
COMCOMCOM
NO
F1
F2
NONO
RELAY CRELAY BRELAY A
J1
J2
J4
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
S1
Disconnect
Power
1
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