Daikin RDT, Руководство по установке и обслуживанию, Страница: 140 / 152

IM 893-10 • ROOFPAK SINGLEZONE UNITS 140 www.DaikinApplied.com
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aInTenanCe
Thermal Overload Relay
Designed to provide current-dependent protection for loads
with normal starting against impermissibility high temperature
rises due to overload, phase asymmetry or phase failure.
Increase in motor current beyond set point as a result to
overload or phase failure will trip the overload and disconnect
the motor.
The Relay trip points are factory set. Do not change unless
the motor ampacity changes or the Relay is replaced with
a new device with incorrect set point adjustment. Any other
non-authorized trip points or set points adjustment voids all or
portions of the unit’s warranty. Authorized set point adjustment
is accomplishment as follows:
1. For motors with 1.15 service factor, rotate the arrow on
the dial to correspond to the motor FLA (See Figure 133 ).
2. For motors with a 1.0 service factor, multiply the motor
FLA with 0.9; then rotate the arrow on the dial to
correspond to that value.
To reset a tripped Relay, push the blue RESET button. To
disconnect, push the Red stop Button (See Figure 133 ).
Other Relay features:
• Three connection systems options, Screw type, spring
loaded and ring cable lug connection.
• Switch position indicator to indicate a trip and TEST
function for wiring.
• Large rotary button to adjust current to Motor RLA.
• Selector switch for manual/and automatic RESET.
Figure 133: Overload Relay
Circuit Breaker
Circuit breakers are installed upstream of all VFDs to provide
short circuit protection. These breakers are not adjustable.
To reset a tripped circuit breaker: Clear the trip by rotating the
lever down to the OFF position (see Figure 134 ). Then rotate
lever up to the ON position ( Figure 134 ).
Breakers, like MMPs, have three distinct modes of operation
which are clearly indicated by the handle position. The
positions are ON (usually up, OFF (usually down), and
TRIPPED (midway). Some circuit breakers may have a push-
to-test button.
1. Press the handle or rotate the lever to the OFF position.
2. Press the handle or rotate the lever the opposite
direction to the ON position.
Reset After Tripping Information
CAUTION
If a breaker is tripped, the handle/lever will be halfway between
the OFF and ON positions. To reset a tripped circuit breaker:
WARNING
If a circuit breaker has tripped due to an overload or a fault
current (short circuit), prior to resetting, the connected wiring
circuits must be checked to determine the cause of the
interruption.
Figure 134: Circuit Breaker