Figure 5-5: Location Of Spd Modules Inside Various Wb Versions - Delta M42U Operation And Installation Manual

Maintenance
• Accessing the Wiring Box
1. Switch AC and DC power off and wait until LCD display turns off.
2. To access the wiring box, use procedure found in Section 5.1.1
Do not leave the WB uncovered for long periods of time.
• Changing the SPD modules - use the following procedure:
The AC and DC SPD units are located as shown in Figure 5-5.
• To remove the defective SPD, refer to Figure 5-6
1. Disengage the white wiring connector from the SPD PCB (3-pin on AC SPD
or the 2-pin on DC SPD).
2. Remove four Phillips head screws at the front (terminal block) side of the
SPD PCB.
3. Remove the single Phillips head screw located on the left (DC) or right (AC)
side of the SPD PCB.
4. Lift and remove the entire SPD PCB and replace with new unit.
5. Install the new SPD using the above procedure in reverse order. Tighten
the five screws to a torque value of 15 lbf-in (1.7 N.m).
• Re-installing the Wiring Box cover
To re-install the WB cover, use the procedure found in Section 5.1.2

Figure 5-5: Location of SPD modules inside various WB versions

AC SPD
74
DC SPD