Symcom 460 Installation Guide

INSTALLATION!

is used on

in a convenient location in or near the motor

control panel. If the location is wet or dusty, the MotorSaver

should

be mounted in a NEMA 4 or 12 enclosure. The MotorSaver

can be

mounted to a back panel using two #6 or #8 x 5/8 screws or can be

snapped onto a DIN rail.

of the motor starter. (See Figure No. 1).

connect the normally open contact in series with the magnetic coil of the

motor starter as shown in Figure No. 1. For alarm operation, connect the

normally closed contact in series with the control circuit as shown in Figure

No. 2.

3-Phase V

oltage

CONTROL VOLTAGE

24-240 VAC

LIGHT

3-Phase V

oltage

CONTROL VOLTAGE

24-240 VAC

to the nominal

three-phase line voltage feeding the motor

to be protected.

adjustment to the

desired position. The restart delay is the

time between MotorSaver

seeing

acceptable voltage and the MotorSaver

closing its output contacts. For

compressor applications, the restart delay

should be set for the approximate time it

takes for the head pressure to bleed

off of the compressor. For other

applications, the restart delay is typically

set between 2 and 10 seconds.

DELAY (SEC)”

adjustment to the desired

setting. This adjustment does not affect the

trip delay on phasing faults. Typically, the

trip delay adjustment is set between 1 and 5

seconds. In areas where voltage  uctuations are frequent, the trip delay

adjustment may be set greater than 10 seconds.

does not recommend operating a motor above 1% voltage unbalance without

the motor. The NEMA MG1 standard also recommends against

operating a motor above a 5% voltage unbalance under any circumstances.

SymCom recommends consulting the motor manufacturer for speci c

tolerances.

MODEL460

190

200

416 440

230

240

380 480

400 460

208 220

Percent Unbalance =

Maximum Deviation from the Average

Average

x 100

Example: The measured line-to-line voltages are 203, 210, and 212.

Average =

203 + 210 + 212

3

= 208.3

The maximum deviation from the average is the largest difference
between the average voltage (208.3) and any one voltage reading.

208.3 - 203 = 5.3 210 - 208.3 = 1.7 212 - 208.3 = 3.7

The maximum deviation from the average is 5.3.

5.3

208.3

x 100 = 2.5% Unbalance

-3- 08/13/03