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WSTECH APS Series - Electrical Connection Torque Check

WSTECH APS Series
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Original Operating Instructions
APS Series Outdoor Hybrid Inverter
Maintenance
APS-Series 120 Operating Instructions v320 EN
Page 143 of 213
8.2.3 Visual Inspection of the Interior Area
Maintenance Tasks:
1. Open all doors (Figure 13, Figure 14).
2. Check the interior area for dust and water accumulation as well as any vermin.
In case of dust accumulation, water accumulation and vermin, remove it
from the interior area.
3. Check parts for discolouration or damage.
In case of discolouration or damage, please contact customer service
(Section 11).
4. Check in Sections +C3 and +C6 if the bursting disc is damaged.
In case of damaged bursting disc, renew the bursting disc.
8.2.4 Cleaning the Air Ducts
Maintenance Tasks:
1. Clean the air ducts (Figure 13, Figure 14) from the outside.
2. Check the ventilation grids for damage.
In case of damage, please contact customer service (Section 11).
8.2.5 Torque Check of the Electrical Connections
Maintenance Tasks:
1. Open all doors (Figure 13, Figure 14).
2. Check connections and connectors of all parts for correct tightness.
If connections are loose, please contact customer service (Section 11)
for specific torque.
Tighten with specific torque.
3. Check the grounding connection (Section 4.6.2), AC connection (Section 4.6.3)
and DC cables at fuse holder (Section 4.6.4) for tightness.
If connections are loose, tighten with shown torque (Table 27).
4. Check insulation and electrical connections for discoloration and corrosion.
In case of discoloration or corrosion, renew the connection.
Tighten with specific or shown torque (Table 27).
Table 27: Torque of electrical connections
Connection
Torque
Grounding
75 Nm
AC connection
75 Nm
Fuse holder NH2 (1000 V
DC
) M10
20 Nm
Fuse holder NH3 (1000 V
DC
) M12
20 Nm
Fuse holder NH2XL (1500 V
DC
) M10
32 Nm
Fuse holder NH3L (1500 V
DC
) M12
32 Nm

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