13
7500 Series Manual
4.1.3 Wiring Requirements and Electrical Connections
Wiring Requirements
1. All applicable local and national wiring codes must be followed when wiring the system.
See IEC 60079-14 for more information.
2. The power supply to this device shall have a separate disconnect. If placed in the hazardous area, it shall
be rated for the area in which it is being installed. Placing the disconnect into the purged enclosure is not
a "safe" area since power needs to be applied to the control unit before the purge cycle is complete.
3. The protective earth wire must be the same size as largest wire used to bring power into the enclosure.
Terminate using a ring lug that is properly crimped at the protective earth stud in the bottom of the
enclosure. The protective earth terminal torque is 12 in lb (1.36 Nm).
4. All wire shall be copper only, rated at a minimum of 80 °C.
5. The wire strip length into the fixed terminal block is 8 mm.
6. The terminal torque is 0.5 Nm to 0.6 Nm.
7. There shall be only one wire per terminal.
8. It is recommended to leave a bit of extra wire loop in the housing.
Electrical Connections
Warning!
When connecting line-to-line power and K1 and K2 are used to switch the power, the alarm function is not
available. For more information, see chapter 6.11.
Warning!
When powering the system line-to-line, both lines are present if K3 is used. In this event, both sides of the
relay contacts must be fused.
Caution!
Use ferrules with all stranded wire types.
Alarm/
Encl
Encl
Valve
L/L1/+
N/L2/-N/L2/-
Te rminal Block Connections
Te rminal Block
L /L1/+ SV1 Alarm/Encl
K2
Encl
K1
N /L2/-N /L2/-
Protective
earth
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