8
7. Earthing and Wiring for Power Supply and Load (Main Circuit)
7-1. Opening/Closing Instrument Cover
Open the cover (printed board case) of the instrument and wire the main terminal board. Loosen the fixing screws (two on the right-hand side of
the instrument, M3 + ) which secure the cover (printed board case) to the body by rotating them by 3 turns or so. (Refer to External Dimensions
on Page 5.)
When the cover is moved to the right, the mounting portion is disengaged from the fixing screws and the cover is free to be opened. In the
case of 80A or 100A, the terminal cover is attachable to the back of the cover (printed board case).
7-2. Earth Wiring
For safety's sake, make sure to use the instrument after grounding it.
The earth terminal screws of the PAC 27 are of mountings screws of M4, M5 and M6 respectively for 20A/30A, 45A/60A and 80A/100A.
Use corresponding terminals, screw tightly and ground with less than 100Ω of earthing resistance.
7-3. Wiring for Power Supply and Load
Three terminal wiring configurations are carried out for the PAC27;
M4 for 20A-30A, 3P terminal board of M5 for 45A-60A, and bar 2 terminals of
M8 & 1P terminal board of M4 for 80A-100A. Select proper terminals and tighten screws firmly.
For wiring R and U terminals, use wire material suitable for current capacity. When T terminals are wired, use wire material of 0.5 mm2
minimum.
8. Wiring for Control Signals
For control signals, M3.5 terminal screws are used. Use a crimp-style terminal of more than 3.5 mm in inside diameter and less than 8 mm in
outside diameter.
Tighten them with a clamping torque of 0.8 to 1.0 N • m.
Control input signal terminals (C1 and C2) receive control signals (4–20 mA, 1–5 A, 0–10 V, contact, etc.) from the controller.
Wiring should be carried out carefully so that noise from a strong electric circuit can be blocked. Pay close attention to the polarity, i.e., + and - of
the terminals.
Countermeasure against lightning surge will be required for signal line over 30m.
8-1. One to One Connection to Controller
˚
Connection to Voltage/current output type controller:
Synchronize the controller output with the control signal of PAC27.
In the case of one to one connection, connect (+) of the output terminal of controller to C1 and (-) to C2.
Current capacity
20A, 30A
45A, 60A
80A, 100A
φ [mm]
4 minimum
5 minimum
6 minimum
D [mm]
10 maximum
13 maximum
16 maximum
Screw to be used
M4
M5
M6
Clamping torque
1.2
ʛ
1.4 N
ʀ
m
2.0
ʛ
2.4 N
ʀ
m
2.5
ʛ
3.0 N
ʀ
m
Current capacity
20A, 30A
45A, 60A
80A or 100A
R and U terminals
80A or 100A
T terminal
φ [mm]
4 minimum
5 minimum
8 minimum
4 minimum
D [mm]
10 maximum
13 maximum
20 maximum
9 maximum
d [mm]
4 minimum
5 minimum
8 minimum
4 minimum
Screw to be used
M4
M5
M8
M4
Clamping torque
1.2
ʛ
1.4 N
ʀ
m
2.0
ʛ
2.4 N
ʀ
m
5.5
ʛ
7.0 N
ʀ
m
1.2
ʛ
1.4N
ʀ
m
In the case of PAC27P4 -, PAC27P3 -, PAC27P6 -
