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Section 4 Maintenance
4.1 Cleaning the Controller
With the enclosure securely closed, wipe the exterior with a damp cloth.
4.2 Fuse Replacement
The instrument contains two mains fuses. Failed fuses are an indication that an
equipment problem could exist. Problem resolution and fuse replacement should
be performed only by qualified service personnel. Refer to
Figure 4-22 and 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,
1.6 A, 250 V, slow blow).
5. Reinstall the high voltage barrier.
6. Close the controller cover and hand-tighten the four screws.
7. Reconnect power to the instrument.
Figure 4-22 Fuse Replacement
1. Fuses F1 and F2, T, 1.6 A, 250 V, slow blow
NCNCNC
COMCOMCOM
NO
F1
F2
NONO
RELAYCRELAYB
RELAYB
RELAYA
J1
J2
J4
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
S1
Disconnect
Power
1