Delta Elektronika SM 120-13 User Manual

MAINTENANCE & CALIBRATION SM1500
20 / 22 DELTA ELEKTRONIKA B.V. rev. Jan. 2021
fig 6 -1
The fan is located at the left side and blows through
the tunnel.
6
MAINTENANCE & CALIBRATION
6.1
GENERAL

The SM-series power sup plies do not need any maintenance
or calibration. However, care must be taken that the cooling of
the unit is not obstructed.
6.2
COOLING FAN

The built up of dust on the impeller of the fan and the heat
sink fins depends on the environment. Since the fan has over-
capacity, dust will not present a problem very quickly.

The internal construction of the power supply is such that no
dust will reach the sensitive control circuitry, only the heat
sink in a tunnel will be cooled by forced air (see fig. 6 - 1).

The thermal protection will shut down the out put in case of
over heating, so the power supply will not be damaged.

It is advisable to inspect the fan and the heat sink regularly.
6.3
GALVANIC INDUSTRY

For using the power supplies in the galvanic industry it is
strongly recommended to take precautions against an
aggressive environment.

An aggressive environment with acid, salt, etc. can harm the
electronic components. Some times even the copper tracks
on the printed circuit boards dissolve.

To avoid problems, the power supplies should be mounted in
a relatively clean room, or mounted in a cabinet receiving
clean air with over pressure, or a cabinet with a heat
exchanger.
6.4
CALIBRATION

The power supplies are factory calibrated and normally need
no further calibration.

Only in special situations, for example after repairing a unit,
calibration can be necessary.
6.5
METER CALIBRATION

DIGITAL METERS
The full scale indication can be calibrated with R25_31
and R25_36 on P596 (see fig. 6 - 2).
6.6
SPECIAL CALIBRATIONS

The following calibrations must be done by qualified
personnel only. Wrong calibration causes malfunction. These
calibrations are only needed after special repairs.
Warning ! Damage caused by a wrong calibration is not
warranted.

CALIBRATING THE CURRENT MONITOR OFFSET.
With R26_73 on P650 the offset of the CC monitor voltage can
be calibrated (see fig. 6 - 3). The unit has to be unloaded, the
output voltage has to be turned off using the OUTPUT
ON/OFF button. Measure the offset voltage of the CC monitor
on the programming connector. Calibrate the offset on a
negative value between –1 mV and zero mV.
Warning! wrong calibration can damage the unit.

CALIBRATING MAX. CURRENT RANGE or CALIBRATING
CC MONITOR FULL SCALE.
Short the output using a low resistive cable. Measure the
output current with an accurate shunt. The maximum output
current can be calibrated with R26_41. R26_41 is located
on P650 (see fig. 6 - 3).
Program CC input with exactly 5.00 V.
Set output voltage to a high value, ensuring the power supply is
in CC mode. Calibrate the current with R26_41 exactly on the
rated max. current.
Warning! Wrong calibration can damage the unit.
fig 6 -2
Meter calibration with 25-turn potmeters on P596.
fig 6 -3
Calibrating maximum current and offset on P650.
V-meter
A-meter

Delta Elektronika SM 120-13 Specifications

General

Brand	Delta Elektronika
Model	SM 120-13
Category	Power Supply
Language	English