Thermo King T-1080S, Maintenance Manual

Page: 83 / 191

Electrical Maintenance
82
be on. If voltage is not present on either the
7EB or 7EC output, replace the phase select
module.
Overload Relay
The overload relay protects the standby electric
motor. It is located in the control box under the
high voltage cover. The overload relay opens the
circuit to the electric motor if the current exceeds
the overload relay setting. The overload relay
resets automatically.
Figure 153: Typical Overload Relay
Overload Relay Replacement
When the overload relay is replaced, the new
overload relay must be set up to open at the
correct amperage and reset automatically. See the
following procedure to set up a new overload
relay.
1. Open the clear plastic cover.
2. Use a small screwdriver to set the opening
amperage. See “Electric Motor and Overload
Relay” in the “Specifications” chapter for the
correct overload relay setting.
3. Use a small screwdriver to remove the tab
marked with an “H” to access the switch used
to set the overload relay to reset automatically.
1. Lift Here to Open Cover
Figure 154: Open Cover
1
1. Set Opening Amperage
2. Remove Tab Marked “H”
Figure 155: Set Amperage and Remove Tab
2
1