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HP 2995 Instructions For Installation And Operation Manual

Download Instructions for installation and operation manual of HP 2995 Power Supply for Free or View it Online on All-Guides.com.

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CL: Current Limit with I

2

t Shutdown

The CL trim pot is used to set the maximum motor

current that occurs in a stalled condition. The CL

trim pot is factory set to approximately 160% of full

control rating (3.8 amps). The CL trim pot can be

readjusted as required.

The current limit also contains an I

2

t trip function.

The control will trip according to a predetermined

current versus time function. The trip curve is

directly related to the CL set point and can be changed with the CL trim

pot. The current limit with I

2

t shutdown is designed to provide motor

overload protection. Readjust the CL trim pot so that it is set to 160% of

full rated motor current as follows.

1. Connect an AC ammeter in series with one motor phase.

2. Lock motor shaft and quickly adjust desired locked rotor motor current

using CL trim pot. Note: This adjustment must be made within 60

seconds or I

2

t trip will occur.

Example: A ½ HP motor has a full load current of 1.8 amps. Set the CL

trim pot to 1.8 X 160% = 2.9 amps.

Percent of CL

Setpoint

Trip Time

(Minutes)

Control Rating

(%)

Motor Current

(Amps/Phase)

100 .1 (6 sec) 160 3.8

88 .8 140 3.4

75 30 120 2.9

63

4

100 2.4

COMP: Slip Compensation

The COMP trim pot is used to maintain set motor speed under varying

loads. The factory setting of 1.5 volts/Hz/amp provides excellent speed

regulation for most motors. The COMP trim pot can be adjusted for

specific applications as required.

1. Wire an AC ammeter in series with one motor

phase.

2. Run motor and set unloaded speed to

approximately 50% speed. Using a tachometer,

record unloaded speed.

3. Load motor to rated motor current (AC amps)

4. Adjust COMP trim pot so that loaded RPM is

equal to unloaded RPM.

5. Motor is now compensated.