Delta M60U, Operation And Installation Manual

Page: 50 / 130

Please read the following instructions for DC wiring (M80/60U
_121
) :
These models are designed to be utilized with external combiner boxes and are
not provisioned with internal DC combining capability.
• Specific size of DC conductors must be determined from NEC or other local codes.
• Ensure the correct conductor is connected to its associated terminal with ring lug
(max width
≤ 25mm).
• The range of conductor sizes accommodated by each DC terminal is 1~3/0AWG.
Tighten each terminal with screw (M6) with a torque value of 52 lbf-in (5.9 N
•
m).
• For aluminum cable :
Min./max. Conductor cross-section 35 / 70 mm
2
Tightening torque 52 lbf-in (5.9 N
•
m)
• For the 121 model, two mounting options for installing the DC connection are
available, bottom (2" chassis access hole (KO)) or side entry (2½" chassis access
hole (KO)). If side entry is required, remove the bus bar with torque value 159.3
lbf-in (18 N
•
m) as shown in Figure 3-30 . After removing the bus bar, if the bottom
entry is again required, install the bus bar back with torque value 159.3 lbf-in (18 N
•
m).
3.4.2 DC Wiring Installation for M80/60U
_121
models
- Please follow the following guideline for cabling if you use aluminum cables.
Guideline for aluminum conductor :
- The oxide layer must be removed from the surface of the stripped aluminum
conductor.
- The stripped aluminum conductor is greased with Vaseline or contact grease
with comparable properties after oxide layer removed.
- Tightened with the maximum tightening torque for the modular terminal block.
- The installation location must be kept free from humidity or aggressive
atmospheres.
ATTENTION
IN1 +
IN2 +
IN1 -
IN2 -
PE
Conductor cross-section: 1 ~ 3/0 AWG (35 ~ 70mm²)
Allowable PE conductor size 6 ~ 4 AWG (14 ~ 22mm²)
Torque terminal screw to 26 lbf-in (3 N
•
m)
EMT
Figure 3-27: Size for DC conductors for M80/60U
_121
50
Installation