Installation - Siemens RAJA+ Installation, Maintenance & Troubleshooting Manual

Installation, Maintenance & Troubleshooting guide | Version 03

3.4: Installation

• Open the door by rotating the door lock anticlockwise.
• Mount the starter on a vertical wall/ plate free from vibrations with proper nuts and bolts.
Refer operating instruction for mounting dimensions.
• Remove the rubber grommets for the incoming and outgoing cable connections. (Refer Fig. 8)
• Connect incoming and outgoing cables as follows (Refer Fig. 8):
- Use proper cable glands to ensure dust proofing. For conduit entry use packed washers.
- Select correct size of cables from Table 15
- Connect line and motor leads exactly as per wiring diagram pasted inside the cover of the starter.
- Terminate the incoming supply cables on terminal block TB1 & outgoing cables to motor on terminal block
TB2,(Tightening torque -Refer table 15B)
NOTE: LMRA is set in Manual mode (Factory setting)
- Connect the earthing conductor to terminals marked (earth) on the starter body with torque 1.2 to 1.6Nm.
The Starter is now ready for commissioning.
Commissioning :
For exact setting of overload relay, follow the instruction given below:
Before switching ON recheck all external connections.
• Overload relay setting:
- For closer protection set the overload relay to actual phase current as measured by an ammeter. In the absence
of an ammeter, use the procedure given below:
- Start the motor and let it run for 30 mins. Then gradually reduce the relay settings till it trips. Set the relay at a
slightly higher value than this setting. Overload relay characteristics shown in Fig. 6 can be used to estimate the
average tripping time at different multiples of set current.
- Allow a reset time of approx. 4 min. before pressing the blue knob on the relay to reset it.
- Restart the motor after some time. If the relay does not trip then consider it to be properly set. If the relay trips,
set at a little higher value than before and recheck.
• Close the front door.
Caution
• During commissioning or maintenance always ensure that the main supply is disconnected by switching
off the main switch & Rocker switch.
• If the relay trips even when set at rated motor current the suitability of the starter/relay for the particular application
should be checked with the nearest Siemens office.
Operating Characteristics:
The given characteristics (Fig. 6) are average values of all ranges and sizes of bimetal relays and are mainly intended to indicate
the inverse time current characteristics & tripping times of the same. The tripping times shown are for relays starting from the cold
state. At operating temperatures (heated at rated current) these are reduced to about 25% of the value obtained from the
characteristics.
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